- vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 37810] GRB 250321A: Fermi GBM Final Real-time Localization
by GCN Circulars 21 Mar '25

21 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39793 SUBJECT: GRB 250321A: Fermi GBM Final Real-time Localization DATE: 25/03/21 00:53:07 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 00:42:39 UT on 21 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250321A (trigger 764210564.016716 / 250321030). The on-ground calculated location, using the Fermi GBM trigger data, is RA =… [View More]

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[vsnet-grb-info 37809] GRB 250320B: Fermi GBM Final Real-time Localization
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39792 SUBJECT: GRB 250320B: Fermi GBM Final Real-time Localization DATE: 25/03/20 23:25:50 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 23:15:22 UT on 20 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250320B (trigger 764205327.02257 / 250320969). The on-ground calculated location, using the Fermi GBM trigger data, is RA = … [View More]

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[vsnet-grb-info 37808] GRB250309B: Proof-of-concept for Joint ZTF+EP Experiment
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39791 SUBJECT: GRB250309B: Proof-of-concept for Joint ZTF+EP Experiment DATE: 25/03/20 20:29:02 GMT FROM: Tomas Ahumada Mena at Caltech <tahumada(a)caltech.edu> T. Ahumada (Caltech), E. C. Bellm (UW), L. Yan, T. du Laz, M. M. Kasliwal (Caltech), Q. Y. Wu, S. Q. Jiang (NAOC, CAS), J. H. Wu (GZHU), Y. Liu, C. Jin, W. Yuan (NAOC, CAS) report on behalf of the Zwicky Transient Facility Partnership and Einstein Probe Team Starting Feb 27, 2025, the … [View More]Zwicky Transient Facility (ZTF) partnership is collaborating with the Einstein Probe (EP) team to map multiple EP pointings concurrently every night with ZTF. By cross-matching ZTF alerts with EP alerts, we report our first proof-of-concept cross-match. On March 9, 2025, Fermi-GBM detected GRB 250309B at 07:38:30 UTC (Preis and Greiner, GCN 39629; Fermi GBM team, GCN 39635; McDermott et al., GCN 39642). As part of the regular schedule, EP was set to cover the region, with ZTF scheduled to shadow EP. Both EP and ZTF subsequently observed the afterglow, ZTF25aaitvjt/AT2025dws. The Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission began observations from 2025-03-09T10:38:05(UTC) (~T0+3h) with an exposure time of 4.8 ks. The WXT position of the source is R.A. = 210.800 deg, DEC = -8.500 deg (J2000) with an uncertainty of 3.1 arcmin in radius (90% C.L. statistical and systematic), which is consistent with the optical counterpart AT2025dws (Stein et al., GCN 39639) and the X-ray counterpart (Page and Evans, GCN 39649). The average WXT 0.5-4 keV spectrum can be fitted with an absorbed power law with a Galactic hydrogen column density of 3.0 x 10^20 cm^-2 and a photon index of 1.8 (-1.2/+1.6). The derived average unabsorbed 0.5-4 keV flux is 9.2 (-5.3/+10.8) x 10^(-12) erg/s/cm^2. The uncertainties are at the 90% confidence level for the above parameters. In this particular example, we clarify that ZTF was double-triggered to observe this field - once by the joint ZTF+EP experiment and once by the IceCube neutrino experiment. Both experiments recovered AT2025dws. We observed a fading rate of 2.5 mag / hour in the r-band. This source was promptly reported by ZTF in Stein et al. GCN 39639. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Award #2407588 and a partnership including Caltech, USA; Caltech/IPAC, USA; University of Maryland, USA; University of California, Berkeley, USA; University of Wisconsin at Milwaukee, USA; Cornell University, USA; Drexel University, USA; University of North Carolina at Chapel Hill, USA; Institute of Science and Technology, Austria; National Central University, Taiwan; Operations are conducted by Caltech's Optical Observatory (COO) and Caltech/IPAC. View this GCN Circular online at https://gcn.nasa.gov/circulars/39791. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37807] GRB 250317B: Mondy AZT-33IK Optical Observations
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39772 SUBJECT: GRB 250317B: Mondy AZT-33IK Optical Observations DATE: 25/03/18 15:19:56 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of GRB 250317B (Zhao et. al, GCN 39753; Götz et. al, GCN 39756; Melandri et. al, GCN 39763) at the redshift of z=3.44 (Thoene et. al, GCN 39769) in the R … [View More]

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[vsnet-grb-info 37806] GRB 250317B: Mondy AZT-33IK Continued Optical Observations
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39790 SUBJECT: GRB 250317B: Mondy AZT-33IK Continued Optical Observations DATE: 25/03/20 13:21:09 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of GRB 250317B (Zhao et. al, GCN 39753; Götz et. al, GCN 39756; Melandri et. al, GCN 39763) at the redshift of z=3.44 (Thoene et. al, GCN 39769) in … [View More]

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[vsnet-grb-info 37805] GRB 250320A: Fermi GBM Final Real-time Localization
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39789 SUBJECT: GRB 250320A: Fermi GBM Final Real-time Localization DATE: 25/03/20 06:16:17 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 06:05:44 UT on 20 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250320A (trigger 764143549.57948 / 250320254). The on-ground calculated location, using the Fermi GBM trigger data, is RA = … [View More]

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[vsnet-grb-info 37804] Fermi GRB 250319B: Global MASTER-Net observations report
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39788 SUBJECT: Fermi GRB 250319B: Global MASTER-Net observations report DATE: 25/03/20 05:30:23 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta,… [View More]

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[vsnet-grb-info 37803] FRB 20250316A: Upper limits for gamma-ray transient from Insight-HXMT/HE observations
by GCN Circulars 20 Mar '25

20 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39787 SUBJECT: FRB 20250316A: Upper limits for gamma-ray transient from Insight-HXMT/HE observations DATE: 25/03/20 02:49:24 GMT FROM: zhangjinpeng(a)ihep.ac.cn Jin-Peng Zhang, Yan-Qiu Zhang, Wang-Chen Xue, Shao-Lin Xiong, Yue Wang (IHEP) and Ce Cai (HEBNU) report on behalf of the Insight-HXMT team: At the event time 2025-03-16T08:33:50.842 UTC (T0) of FRB 20250316A (Ng et al., ATel 17081; Leung et al., ATel 17086), Insight-HXMT/HE was observing normally … [View More]

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[vsnet-grb-info 37802] GRB 250313A: GRBAlpha detection
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39786 SUBJECT: GRB 250313A: GRBAlpha detection DATE: 25/03/19 21:08:05 GMT FROM: Michaela Ďuríšková at Masaryk University <505876(a)mail.muni.cz> M. Duriskova, M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, L. Szakszonova, M. Kolar,J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A.… [View More] Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 250313A (FERMI/GBM: GCN Circular 39703, FERMI/LAT: GCN Circular 39711, AstroSat/CZTI: GCN Circular 39714, SVOM/GRM: GCN Circular 39716, Konus-Wind: GCN Circular 39721, CALET/CGBM: GCN Circular 39725) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract). The detection was confirmed at the peak time 2025-03-13 14:34:41.7 UTC. The T90 duration measured by GRBAlpha is 13 s and the overall significance during T90 reaches 52.3 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB250313A_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. View this GCN Circular online at https://gcn.nasa.gov/circulars/39786. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37801] LIGO/Virgo/KAGRA S250206dm: LIGHETR followup observations of AT2025azn
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39785 SUBJECT: LIGO/Virgo/KAGRA S250206dm: LIGHETR followup observations of AT2025azn DATE: 25/03/19 17:15:20 GMT FROM: Hsin-Yu Chen at The University of Texas at Austin <hsinyu(a)austin.utexas.edu> Hsin-Yu Chen (UT Austin), Greg Zeimann (UT McDonald Observatory), J. Craig Wheeler (UT Austin), and Jozsef Vinko (Konkoly Observatory) report on behalf of the LIGHETR Collaboration: We conducted targeted follow-up observations of AT 2025azn (Hosseinzadeh … [View More]

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[vsnet-grb-info 37800] GRB 250317B: SVOM/COLIBRI (F-GFT) follow-up observations
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39784 SUBJECT: GRB 250317B: SVOM/COLIBRI (F-GFT) follow-up observations DATE: 25/03/19 17:09:35 GMT FROM: Jean-Luc Atteia at IRAP <jean-luc.atteia(a)irap.omp.eu> Jean-Luc Atteia (IRAP), Sarah Antier (OCA/IJCLAB), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Dalya Akl (AUS), Camila Angulo (UNAM), Rosa L. Becerra (U Roma), Nathaniel R. Butler (ASU), Francis Fortin (IRAP), Noémie Globus (UNAM), … [View More]

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[vsnet-grb-info 37799] GRB 250319B: Fermi GBM Final Localization
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39783 SUBJECT: GRB 250319B: Fermi GBM Final Localization DATE: 25/03/19 15:50:43 GMT FROM: Cuán de Barra at UCD <cuan.debarra(a)ucdconnect.ie> The Fermi GBM team reports the detection of a likely SHORT GRB "At 05:07:28.91 UT on 19 March 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250319B (trigger 764053653/250319214). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 246.18, Dec = -70.90 (J2000 … [View More]

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[vsnet-grb-info 37798] GRB 250319A: Fermi GBM Final Localization
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39782 SUBJECT: GRB 250319A: Fermi GBM Final Localization DATE: 25/03/19 15:14:51 GMT FROM: rhamburg(a)usra.edu The Fermi GBM team reports the detection of a likely LONG GRB "At 04:52:59.46 UT on 19 March 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250319A (trigger 764052784/250319203). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 335.24, Dec = -62.32 (J2000 degrees, equivalent to J2000 22h 21m, -… [View More]

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[vsnet-grb-info 37797] GRB250317D: EIRSAT-1 GMOD Detection
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39781 SUBJECT: GRB250317D: EIRSAT-1 GMOD Detection DATE: 25/03/19 14:00:39 GMT FROM: Caimin McKenna at University College Dublin <caimin.mckenna(a)ucdconnect.ie> C. McKenna, D. Murphy, C. de Barra, A. Ulyanov, P. McDermott, G. Finneran, M. Doyle, R. Dunwoody, J. Mangan, G. Corcoran, L. Cotter, A. Empey, J. Fisher, F. Gibson Kiely, J. Thompson, D. McKeown, A. Martin-Carrillo, L. Hanlon, S. McBreen, on behalf of the EIRSAT-1 team: EIRSAT-1 reports … [View More]

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[vsnet-grb-info 37796] LIGO/Virgo/KAGRA S250319bu: Updated Sky localization
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39780 SUBJECT: LIGO/Virgo/KAGRA S250319bu: Updated Sky localization DATE: 25/03/19 13:55:10 GMT FROM: Aditya Vijaykumar <aditya.vijaykumar(a)ligo.org> The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further analysis of the LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) data around the time of the compact binary merger (CBC) candidate … [View More]

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[vsnet-grb-info 37795] GRB 250314A: ATCA radio upper limits
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39779 SUBJECT: GRB 250314A: ATCA radio upper limits DATE: 25/03/19 13:49:11 GMT FROM: Tao An at SHAO, CAS <antao(a)shao.ac.cn> Tao An, Yuanqi Liu, Kexuan Chong (SHAO), Jinjun Geng, Xuefeng Wu (PMO), report on behalf of a large collaboration: We have conducted radio observations of the high-redshift gamma-ray burst GRB 250314A (GCN 39719, 39729; redshift z ~ 7.3, GCN 39732, 39743) using the Australia Telescope Compact Array (ATCA). Our observations … [View More]

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[vsnet-grb-info 37794] EP250302a: VLA observations
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39778 SUBJECT: EP250302a: VLA observations DATE: 25/03/19 11:45:41 GMT FROM: Tao An at SHAO, CAS <antao(a)shao.ac.cn> Ailing Wang (IHEP), Tao An (SHAO), Cuiyuan Dai and Xiangyu Wang (NJU), report on behalf of a larger collaboration: We report radio observations of EP250302a (GCN 39556) conducted with the Karl G. Jansky Very Large Array (VLA) on 2025 March 15, UT02:17-03:38 (approximately T0+13 days after the initial trigger). Observations were … [View More]

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[vsnet-grb-info 37793] GRB 250317B: OHP/T193 continued follow-up
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39777 SUBJECT: GRB 250317B: OHP/T193 continued follow-up DATE: 25/03/19 08:16:18 GMT FROM: Emeric Le Floc'h at CEA-Saclay <emeric.lefloch(a)cea.fr> B. Schneider (LAM), C. Adami (LAM/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), A. Ugarte Postigo (LAM), M. Dennefeld (IAP/CNRS/Sorbonne U.) and D. Turpin (CEA/Irfu) report on behalf of the MISTRAL-GRB collaboration: We performed additional observations of the optical counterpart of GRB 250317B (Zhao et al., GCN … [View More]

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[vsnet-grb-info 37792] LIGO/Virgo/KAGRA S250319bu: Identification of a GW compact binary merger candidate
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39776 SUBJECT: LIGO/Virgo/KAGRA S250319bu: Identification of a GW compact binary merger candidate DATE: 25/03/19 07:43:35 GMT FROM: sreedevi_p230198ph(a)nitc.ac.in The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We identified the compact binary merger candidate S250319bu during real-time processing of data from LIGO Hanford Observatory (H1), LIGO Livingston Observatory (L1), and Virgo Observatory (V1) at 2025-… [View More]03-19 06:25:36.479 UTC (GPS time: 1426400754.479). The candidate was found by the GstLAL [1], MBTA [2], and SPIIR [3] analysis pipelines. S250319bu is an event of interest because its false alarm rate, as estimated by the online analysis, is 4.7e-10 Hz, or about one in 67 years. The event's properties can be found at this URL: https://gracedb.ligo.org/superevents/S250319bu The classification of the GW signal, in order of descending probability, is BBH (>99%), Terrestrial (<1%), NSBH (<1%), or BNS (<1%). The LIGO Hanford detector lost its working point about two seconds after the merger time. That has been carefully investigated by the LVK rapid response team and should have no impact on the significance of the signal nor on its classification or skymap. Assuming the candidate is astrophysical in origin, the probability that at least one of the compact objects is consistent with a neutron star mass (HasNS) is <1%. [4] Using the masses and spins inferred from the signal, the probability of matter outside the final compact object (HasRemnant) is <1%. [4] Both HasNS and HasRemnant consider the support of several neutron star equations of state for maximum neutron star mass. The probability that either of the binary components lies between 3 and 5 solar masses (HasMassGap) is <1%. Three sky maps are available at this time and can be retrieved from the GraceDB event page: * bayestar.multiorder.fits,0, an initial localization generated by BAYESTAR [5], distributed via GCN notice about 23 seconds after the candidate event time. * bayestar.multiorder.fits,1, an initial localization generated by BAYESTAR [5], distributed via GCN notice about 28 seconds after the candidate event time. * bayestar.multiorder.fits,2, an initial localization generated by BAYESTAR [5], distributed via GCN notice about 5 minutes after the candidate event time. The preferred sky map at this time is bayestar.multiorder.fits,2. For the bayestar.multiorder.fits,2 sky map, the 90% credible region is 2057 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4372 +/- 1308 Mpc (a posteriori mean +/- standard deviation). For further information about analysis methodology and the contents of this alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide https://emfollow.docs.ligo.org/. [1] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and Ewing et al. PRD 109, 042008 (2024) doi:10.1103/PhysRevD.109.042008 [2] Aubin et al. CQG 38, 095004 (2021) doi:10.1088/1361-6382/abe913 [3] Chu et al. PRD 105, 024023 (2022) doi:10.1103/PhysRevD.105.024023 [4] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe [5] Singer & Price PRD 93, 024013 (2016) doi:10.1103/PhysRevD.93.024013 View this GCN Circular online at https://gcn.nasa.gov/circulars/39776. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37791] GRB 250317C: SVOM/GRM observation of a long burst
by GCN Circulars 19 Mar '25

19 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39775 SUBJECT: GRB 250317C: SVOM/GRM observation of a long burst DATE: 25/03/19 02:11:00 GMT FROM: Yue Wang <m18509381757(a)163.com> SVOM/GRM team: Yue Wang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Tais Maiolino, Frédéric Piron (LUPM), Stéphane Schanne (CEA), Jean-Luc Atteia (IRAP) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by GRB 250317C (SVOM trigger reference: … [View More]

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[vsnet-grb-info 37790] GRB 250317B: Leavitt Observatory optical upper limit
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39774 SUBJECT: GRB 250317B: Leavitt Observatory optical upper limit DATE: 25/03/18 20:04:16 GMT FROM: leavittob(a)gmail.com L. Moretti, E. Pavoni (Leavitt Observatory, Italy) Members of: GRB/UAI - Gamma Ray Burst Section of Unione Astrofili Italiani ATA - Associazione Tuscolana di Astronomia In a large collaboration with: M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus … [View More]

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[vsnet-grb-info 37789] GRB 250309B/AT2025dws: further ATCA observations
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39773 SUBJECT: GRB 250309B/AT2025dws: further ATCA observations DATE: 25/03/18 17:15:37 GMT FROM: James Leung at U. Toronto / HUJI <jamesk.leung(a)utoronto.ca> J. K. Leung (U. Toronto/HUJI), G. E. Anderson (Curtin University), A. J. van der Horst (GWU), L. Rhodes (TSI/McGill), Maria Drout (U. Toronto), Andrew Hughes (U. Oxford) report on behalf of a larger collaboration: We report a second epoch of Australia Telescope Compact Array (ATCA) radio … [View More]

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[vsnet-grb-info 37788] GRB 250317B: Mondy AZT-33IK Optical Observations
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39772 SUBJECT: GRB 250317B: Mondy AZT-33IK Optical Observations DATE: 25/03/18 15:19:56 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of GRB 250317B (Zhao et. al, GCN 39753; Götz et. al, GCN 39756; Melandri et. al, GCN 39763) in the R filter with the 1.5-meter AZT-33IK telescope of the Sayan … [View More]

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[vsnet-grb-info 37787] GRB 250317C: AstroSat CZTI detection
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39771 SUBJECT: GRB 250317C: AstroSat CZTI detection DATE: 25/03/18 15:13:24 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> S. Salunke (IUCAA), M. Tembhurnikar (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data with the CIFT framework (… [View More]

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[vsnet-grb-info 37786] GRB 250317B: NOT optical observations suggest an optical plateau phase
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39770 SUBJECT: GRB 250317B: NOT optical observations suggest an optical plateau phase DATE: 25/03/18 13:35:17 GMT FROM: Antonio Martin-Carrillo at UCD,Space Science Group <antonio.martin-carrillo(a)ucd.ie> Z. P. Zhu (NAOC), D. B. Malesani (DAWN/NBI and Radboud Univ.), B. Schneider (LAM), A. Martin-Carrillo (UCD), A. Henderson de la Fuente (NOT), report on behalf of a larger collaboration: We observed the field of the GRB 250317B (Zhao et al., GCN … [View More]

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[vsnet-grb-info 37785] GRB 250317B: GTC/OSIRIS+ spectroscopic redshift z=3.44
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39769 SUBJECT: GRB 250317B: GTC/OSIRIS+ spectroscopic redshift z=3.44 DATE: 25/03/18 12:43:40 GMT FROM: Christina Thöne at ASU-CAS <christina.thoene(a)gmail.com> C. C. Thoene (AbAO), A. de Ugarte Postigo (LAM), D. B. Malesani (DAWN/NBI and Radboud Univ.), J. F. Agui Fernandez (CAHA), N. A. Rakotondrainibe (LAM), A. Martin-Carrillo (UCD), N. R. Tanvir (Univ. Leicester), L. Izzo (INAF/OACn and DARK/NBI), J. P. U. Fynbo (DAWN/NBI), S. Geier (GTC), G. … [View More]

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[vsnet-grb-info 37784] GRB 250317C: GECAM-B detection
by GCN Circulars 18 Mar '25

18 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39768 SUBJECT: GRB 250317C: GECAM-B detection DATE: 25/03/18 11:31:10 GMT FROM: Yue Wang <m18509381757(a)163.com> Yue Wang, Shao-Lin Xiong, Chen-Wei Wang report on behalf of the GECAM team: GECAM-B was triggered both in-flight and on-ground by a long burst, GRB 250317C, at 2025-03-17T17:31:21.700 UTC (T0). According to the event-by-event data, the GECAM-B light curve shows a main pulse with a with a T90 of 23.0 +3.0/-4.0 s in the 40-6000 keV band. … [View More]

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[vsnet-grb-info 37783] GRB 250317B: OHP/T193 optical observations
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39767 SUBJECT: GRB 250317B: OHP/T193 optical observations DATE: 25/03/17 23:30:24 GMT FROM: Benjamin Schneider at MIT <bschn(a)mit.edu> B. Schneider (LAM), C. Adami (LAM/Pytheas/AMU), E. Le Floc'h (CEA/Irfu), A. Ugarte Postigo (LAM), M. Dennefeld (IAP/CNRS/Sorbonne U.) and D. Turpin (CEA/Irfu) report on behalf of a larger collaboration: We observed the field of the GRB 250317B (Zhao et al., GCN 39753) using the T193cm telescope at the Observatoire de … [View More]

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[vsnet-grb-info 37782] Fermi trigger No 763933627: Global MASTER-Net observations report
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39766 SUBJECT: Fermi trigger No 763933627: Global MASTER-Net observations report DATE: 25/03/17 23:02:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, … [View More]F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB250317.82 (trigger No 763933627,04h 54m 02.40s , -35d 41m 24.0s, R=1.38) errorbox 18 sec after notice time and 9688 sec after trigger time at 2025-03-17 22:28:31 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 79 deg. The sun altitude is -56.6 deg. The galactic latitude b = -38 deg., longitude l = 238 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2814784 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 9718 | 2025-03-17 22:28:31 | MASTER-SAAO | (04h 53m 49.54s , -35d 43m 51.2s) | C | 60 | 17.4 | 9778 | 2025-03-17 22:28:31 | MASTER-SAAO | (04h 53m 49.54s , -35d 43m 51.2s) | C | 180 | 18.0 | Coadd 9798 | 2025-03-17 22:29:50 | MASTER-SAAO | (04h 53m 50.06s , -35d 43m 48.1s) | C | 60 | 17.5 | 9877 | 2025-03-17 22:31:09 | MASTER-SAAO | (04h 53m 50.57s , -35d 43m 45.2s) | C | 60 | 17.4 | 9956 | 2025-03-17 22:32:28 | MASTER-SAAO | (04h 53m 51.09s , -35d 43m 42.4s) | C | 60 | 17.4 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/39766. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37781] GRB250312A: Swift/UVOT Upper Limits
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39765 SUBJECT: GRB250312A: Swift/UVOT Upper Limits DATE: 25/03/17 20:21:01 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M. H.Siegel (PSU) and A. Melandri (INAF-OAR) on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 250312A 464s after the BAT trigger (Melandri et al., GCN Circ. 39686). No optical afterglow consistent with the enhanced XRT position (Evans et al., GCN Circ. 39693) is detected in … [View More]

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[vsnet-grb-info 37780] GRB 250317B: REM optical/NIR observations
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39764 SUBJECT: GRB 250317B: REM optical/NIR observations DATE: 25/03/17 15:27:41 GMT FROM: Matteo Ferro at INAF-OAB <matteo.ferro(a)inaf.it> M. Ferro, R. Brivio, S. Covino, P. D'Avanzo, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of the SVOM GRB 250317B (Zhao et al., GCN 39752 & GCN 39753; Götz et al. GCN 39756) with the REM 60 cm robotic telescope located at the ESO observatory of La Silla (Chile). The … [View More]

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[vsnet-grb-info 37779] GRB 250317B: Swift-XRT observations
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39763 SUBJECT: GRB 250317B: Swift-XRT observations DATE: 25/03/17 15:05:53 GMT FROM: Andrea Melandri at INAF-OAR <andrea.melandri(a)inaf.it> A. Melandri (INAF-OAR), V. D'Elia (SSDC & INAF-OAR), E. Ambrosi, A. D'Ai (INAF-IASFPA) , J.A. Kennea (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the SVOM/ECLAIRs GRB 250317B (Zhao et al., GCN circ. 39752 and GCN circ. 39753) … [View More]

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[vsnet-grb-info 37778] GRB 250316A: Swift/UVOT Upper Limits
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39762 SUBJECT: GRB 250316A: Swift/UVOT Upper Limits DATE: 25/03/17 13:26:57 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team: Swift/UVOT observed the field of GRB250316A (GCN 39737) for a total of 3.3 ks in the white filter from 21.8 ks to 29 ks after the Fermi trigger. We detect no optical/UV source at the position of the XRT afterglow (Beardmore et al., GCN Circ. 39758) to an upper … [View More]

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[vsnet-grb-info 37777] GRB 250314A: REM optical/NIR upper limits
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39761 SUBJECT: GRB 250314A: REM optical/NIR upper limits DATE: 25/03/17 13:09:40 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio(a)inaf.it> R. Brivio, M. Ferro, S. Covino, P. D'Avanzo, S. Campana (INAF-OAB), D. B. Malesani (DAWN/NBI and Radboud), A. Melandri (INAF-OAR), D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of the SVOM GRB 250314A (Wang et al., GCN 39719), followed-up by Swift/XRT (Kennea et al., GCN … [View More]

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[vsnet-grb-info 37776] GRB 250316A: AbAO AS-32 Optical Upper Limit
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39760 SUBJECT: GRB 250316A: AbAO AS-32 Optical Upper Limit DATE: 25/03/17 12:43:30 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of GRB 250316A (The Fermi GBM team, GCN 39741; Ronchini et. al, GCN 39744; Evans, GCN 39745; Lipunov et. al, GCN 39747; Kennea et. al, GCN 39750; Bala … [View More]

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[vsnet-grb-info 37775] EP 250317B: Fading optical counterpart detection by LCO
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39759 SUBJECT: EP 250317B: Fading optical counterpart detection by LCO DATE: 25/03/17 11:21:28 GMT FROM: ankur ghosh at CAPP, University of Johannesburg <ghosh.ankur1994(a)gmail.com> Ankur Ghosh, Soebur Razzaque (CAPP, University of Johannesburg), Alexander Moskvitin, Yulia Sotnikova (SAO RAS), Naveen Dukiya (ARIES), Rahul Gupta (NASA GSFC) on behalf of a larger collaboration. We observed the field of the GRB 250317B triggered by SVOM/ECLAIRs (Zhao … [View More]

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[vsnet-grb-info 37774] GRB 250316A: Swift-XRT afterglow detection
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39758 SUBJECT: GRB 250316A: Swift-XRT afterglow detection DATE: 25/03/17 09:48:06 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , J.A. Kennea (PSU), D.N. Burrows (PSU), M. A. Williams (PSU), J.P. Osborne (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has conducted further … [View More]

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[vsnet-grb-info 37773] GRB 250317B: LCO detection of the fading optical afterglow
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39757 SUBJECT: GRB 250317B: LCO detection of the fading optical afterglow DATE: 25/03/17 09:34:57 GMT FROM: Ismael Perez-Fournon at Instituto de Astrofisica de Canarias <ipf(a)iac.es> I. Pérez-Fournon, F. Poidevin (IAC and ULL), D. Cano-Morales, I. Correa-Plasencia, and A.E. Hernández-Díaz (ULL) We report Las Cumbres Observatory Global Telescope network (LCOGT) observations of the field of GRB 250317B, discovered by SVOM/ECLAIRs (Zhao et al., GCN … [View More]

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[vsnet-grb-info 37772] GRB 250317B: refined SVOM/MXT analysis
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39756 SUBJECT: GRB 250317B: refined SVOM/MXT analysis DATE: 25/03/17 08:04:00 GMT FROM: Diego Gotz at CEA <diego.gotz(a)cea.fr> D. Götz (CEA), F. Robinet (IJCLab), H. Goto (CEA), C. Plasse (CEA), P. Maggi (ObAS), M. Moita (CEA), C. van Hove (IJCLab) on behalf of the MXT team report: We performed further analysis of the GRB 250317B (Zhao et al., GCN 39753) MXT X-ray data, using promptly downloaded photons through the VHF band. We can improve the X-ray … [View More]

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[vsnet-grb-info 37771] GRB250317B: SVOM/VT detection of an optical candidate from VHF data
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39755 SUBJECT: GRB250317B: SVOM/VT detection of an optical candidate from VHF data DATE: 25/03/17 06:48:34 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> J. T. Palmerio (CEA) reports on behalf of the SVOM/VT team: After the trigger by SVOM/ECLAIRs at 2025-03-17T02:12:08 UTC (Tb), SVOM performed an automatic slew on the burst. SVOM/VT began observing the field at 2025-03-17T02:18:21, 362 seconds after the SVOM trigger, in the VT_B (400nm-650nm) and VT_R … [View More]

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[vsnet-grb-info 37770] GRB 250317B: SVOM/F-GFT (COLIBRÍ) Detection of a Fading Optical Counterpart
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39754 SUBJECT: GRB 250317B: SVOM/F-GFT (COLIBRÍ) Detection of a Fading Optical Counterpart DATE: 25/03/17 06:31:31 GMT FROM: Sarah Antier at OCA <sarah.antier(a)oca.eu> Alan M. Watson (UNAM), Sarah Antier (OCA/IJCLAB), Jean-Luc Atteia (IRAP), Jean-Grégoire Ducoin (CPPM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Dalya Akl (AUS), Camila Angulo (UNAM), Rosa L. Becerra (U Roma), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Francis Fortin (… [View More]

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[vsnet-grb-info 37769] GRB 250317B: SVOM detection of a burst / correction to GRB name of GCN 39752
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39753 SUBJECT: GRB 250317B: SVOM detection of a burst / correction to GRB name of GCN 39752 DATE: 25/03/17 05:29:56 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Donghua Zhao, Yinuo Ma, Wenjin XIE(NAOC), Li Zhang (IHEP), F. Robinet (IJCLab), Liping Xin (NAOC) on behalf of the SVOM mission team. At 2025-03-17T02:12:08 UTC (Tb) SVOM/ECLAIRs triggered on the gamma-ray burst GRB 250317B (SVOM burst-id sb25031701). The following trigger information was … [View More]received on the ground with low latency by the SVOM VHF Alert Network. The burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 13 alerts. CRT provided the alert with the best signal-to-noise-ratio (SNR) of 14.27 in the [5-8] keV energy band over a time window of 40.96 seconds starting at Tb. The light curve showed a broad peak structure with a T90 duration of about 145.67 (-0.16 +0.16). The localization of the best alert is R.A., Dec 211.665, 40.056 degrees (J2000) with a 90% C.L. radius of 5.75 arcmin (including systematic error of 2 arcmin added in quadrature). SVOM slewed to the burst. MXT began observing the field at 2025-03-17T02:14:36 UTC, 148 seconds after Tb. Using onboard processed data we found a bright and rapidly fainting uncatalogued X-ray source located at R.A., Dec 211.648, 40.057 degrees: RA (J2000) = 14h06m35s DEC (J2000) = 40d03m23s with a 90% C.L. radius of 25 arcseconds. This location is 48 arcseconds away from the ECLAIRs onboard position. VT began to observe the field after the slew. No uncatalogued sources were detected within MXT errors compared to DESI catalog based on the VHF sequences. The 3 sigma limit magnitude is about VT_R~21 mag (AB) at about 10 minutes after the trigger. More analysis will be performed after receiving the X band data later. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. The Burst Advocate (BA) on shift for this burst is Donghua Zhao (zhaodh(a)bao.ac.cn). Please contact the BA by email if you require additional information regarding the SVOM follow-up of this burst. We apologize for any confusion and inconvenience caused by this mistake. View this GCN Circular online at https://gcn.nasa.gov/circulars/39753. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37768] GRB 250317A: SVOM detection of a burst
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39752 SUBJECT: GRB 250317A: SVOM detection of a burst DATE: 25/03/17 03:38:10 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Donghua Zhao, Yinuo Ma, Wenjin XIE(NAOC), Li Zhang (IHEP), F. Robinet (IJCLab), Liping Xin (NAOC) on behalf of the SVOM mission team. At 2025-03-17T02:12:08 UTC (Tb) SVOM/ECLAIRs triggered on the gamma-ray burst GRB 250317A (SVOM burst-id sb25031701). The following trigger information was received on the ground with low latency … [View More]by the SVOM VHF Alert Network. The burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 13 alerts. CRT provided the alert with the best signal-to-noise-ratio (SNR) of 14.27 in the [5-8] keV energy band over a time window of 40.96 seconds starting at Tb. The light curve showed a broad peak structure with a T90 duration of about 145.67 (-0.16 +0.16). The localization of the best alert is R.A., Dec 211.665, 40.056 degrees (J2000) with a 90% C.L. radius of 5.75 arcmin (including systematic error of 2 arcmin added in quadrature). SVOM slewed to the burst. MXT began observing the field at 2025-03-17T02:14:36 UTC, 148 seconds after Tb. Using onboard processed data we found a bright and rapidly fainting uncatalogued X-ray source located at R.A., Dec 211.648, 40.057 degrees: RA (J2000) = 14h06m35s DEC (J2000) = 40d03m23s with a 90% C.L. radius of 25 arcseconds. This location is 48 arcseconds away from the ECLAIRs onboard position. VT began to observe the field after the slew. No uncatalogued sources were detected within MXT errors compared to DESI catalog based on the VHF sequences. The 3 sigma limit magnitude is about VT_R~21 mag (AB) at about 10 minutes after the trigger. More analysis will be performed after receiving the X band data later. The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. The Burst Advocate (BA) on shift for this burst is Donghua Zhao (zhaodh(a)bao.ac.cn). Please contact the BA by email if you require additional information regarding the SVOM follow-up of this burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/39752. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37767] GRB 250316A: Fermi GBM Observation
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39751 SUBJECT: GRB 250316A: Fermi GBM Observation DATE: 25/03/17 03:14:06 GMT FROM: sumanbala2210(a)gmail.com S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 08:59:57.69 UT on 16 March 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250316A (trigger 763808402/250316375). which was also detected by Swift/BAT-GUANO (Ronchini et al. 2025, GCN 39744). The Fermi GBM on-ground location is … [View More]

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[vsnet-grb-info 37766] GRB 250316A: Swift-XRT observations
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39750 SUBJECT: GRB 250316A: Swift-XRT observations DATE: 25/03/17 00:35:45 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , D.N. Burrows (PSU), M. A. Williams (PSU), J.P. Osborne (U. Leicester) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations … [View More]

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[vsnet-grb-info 37765] Fermi trigger No 763862734: Global MASTER-Net observations report
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39749 SUBJECT: Fermi trigger No 763862734: Global MASTER-Net observations report DATE: 25/03/17 00:16:11 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, … [View More]

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[vsnet-grb-info 37764] GRB 250317A: Fermi GBM Final Real-time Localization
by GCN Circulars 17 Mar '25

17 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39748 SUBJECT: GRB 250317A: Fermi GBM Final Real-time Localization DATE: 25/03/17 00:16:07 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 00:05:29 UT on 17 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250317A (trigger 763862734.52183 / 250317004). The on-ground calculated location, using the Fermi GBM trigger data, is RA = … [View More]

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[vsnet-grb-info 37763] Fermi GRB 250316A: Global MASTER-Net observations report
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39747 SUBJECT: Fermi GRB 250316A: Global MASTER-Net observations report DATE: 25/03/16 19:32:26 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta,… [View More] R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250316A ( Fermi GBM team, GCN 39741) errorbox 36240 sec after notice time and 36276 sec after trigger time at 2025-03-16 19:04:34 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 55 deg. The sun altitude is -38.8 deg. The galactic latitude b = 75 deg., longitude l = 24 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2813565 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 36307 | 2025-03-16 19:04:34 | MASTER-Kislovodsk | (13h 45m 52.80s , +24d 09m 52.7s) | C | 60 | 16.2 | 36387 | 2025-03-16 19:05:54 | MASTER-Kislovodsk | (13h 54m 40.28s , +24d 10m 54.0s) | C | 60 | 16.5 | 36527 | 2025-03-16 19:08:14 | MASTER-Kislovodsk | (13h 41m 50.76s , +26d 03m 19.9s) | C | 60 | 17.3 | 36609 | 2025-03-16 19:09:36 | MASTER-Kislovodsk | (13h 50m 50.40s , +26d 03m 08.2s) | C | 60 | 17.0 | 36689 | 2025-03-16 19:10:56 | MASTER-Kislovodsk | (13h 58m 47.69s , +26d 02m 55.6s) | C | 60 | 17.1 | 36769 | 2025-03-16 19:12:16 | MASTER-Kislovodsk | (14h 07m 45.91s , +26d 04m 05.9s) | C | 60 | 16.8 | 36849 | 2025-03-16 19:13:36 | MASTER-Kislovodsk | (14h 02m 29.99s , +24d 10m 37.1s) | C | 60 | 16.8 | 36928 | 2025-03-16 19:14:55 | MASTER-Kislovodsk | (14h 11m 21.21s , +24d 09m 17.3s) | C | 60 | 16.4 | 37235 | 2025-03-16 19:20:02 | MASTER-Kislovodsk | (13h 45m 55.17s , +24d 10m 08.5s) | C | 60 | 16.9 | 37315 | 2025-03-16 19:21:22 | MASTER-Kislovodsk | (13h 54m 37.47s , +24d 11m 22.2s) | C | 60 | 16.8 | 37394 | 2025-03-16 19:22:41 | MASTER-Kislovodsk | (13h 41m 51.58s , +26d 04m 40.2s) | C | 60 | 17.0 | 37474 | 2025-03-16 19:24:01 | MASTER-Kislovodsk | (13h 50m 48.05s , +26d 05m 34.6s) | C | 60 | 16.9 | 37553 | 2025-03-16 19:25:21 | MASTER-Kislovodsk | (13h 58m 42.08s , +26d 04m 34.8s) | C | 60 | 16.8 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/39747. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37762] GRB 250314A: SVOM/GRM analysis
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39746 SUBJECT: GRB 250314A: SVOM/GRM analysis DATE: 25/03/16 18:36:43 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Nicolas Dagoneau (CEA), Maria-Grazia Bernardini (INAF-OAB), Jean-Luc Atteia (IRAP), Frédéric Piron (LUPM) Report on behalf of the SVOM team: With the event-by-event data downloaded through the X-band ground station,… [View More]

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[vsnet-grb-info 37761] GRB 250316A: Swift ToO observations
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39745 SUBJECT: GRB 250316A: Swift ToO observations DATE: 25/03/16 14:58:29 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Swift/BAT GRB 250316A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021823 Any uncatalogued X-ray sources detected in this analysis will be reported on … [View More]

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[vsnet-grb-info 37760] GRB 250316A: Swift/BAT-GUANO arcminute localization of a burst
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39744 SUBJECT: GRB 250316A: Swift/BAT-GUANO arcminute localization of a burst DATE: 25/03/16 14:47:14 GMT FROM: Samuele Ronchini at PSU <sjs8171(a)psu.edu> Samuele Ronchini (PSU), James DeLaunay (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 250316A onboard (T0: 2025-03-16T08:59:57.690 UTC, Fermi GCN 39741). The Fermi notice, distributed in near real-… [View More]

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[vsnet-grb-info 37759] GRB 250314A: GTC z-band upper limit and updated photo-z ~ 7.27
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39743 SUBJECT: GRB 250314A: GTC z-band upper limit and updated photo-z ~ 7.27 DATE: 25/03/16 10:32:24 GMT FROM: Antonio de Ugarte Postigo at LAM, CNRS <adeugartepostigo(a)gmail.com> N. A. Rakotondrainibe (LAM), A. de Ugarte Postigo (LAM), L. Izzo (INAF/OACN), D. B. Malesani (DAWN/NBI and Radboud), J. F. Agui Fernandez (CAHA), J. P. U. Fynbo (DAWN/NBI), S. Geier (GTC), G. Lombardi (GTC), A. Martin-Carrillo (UCD), N. R. Tanvir (Leicester), C. C. Thoene (… [View More]

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[vsnet-grb-info 37758] The EP-WXT trigger 01709132801 is likely a flaring star
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39742 SUBJECT: The EP-WXT trigger 01709132801 is likely a flaring star DATE: 25/03/16 09:55:17 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> D. Y. Li (NAOC, CAS), Q. C. Shui (IHEP, CAS), M. Q. Huang (UCST), Y. Liu (NAOC, CAS) report on behalf of the Einstein Probe team: The EP-WXT trigger (ID: 01709132801) on 2025-03-16T07:30:48.149 (UTC) is likely a stellar flare associated with the low mass star LP 368-98 or LP 368-99. The estimated flux of the … [View More]

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[vsnet-grb-info 37757] GRB 250316A: Fermi GBM Final Real-time Localization
by GCN Circulars 16 Mar '25

16 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39741 SUBJECT: GRB 250316A: Fermi GBM Final Real-time Localization DATE: 25/03/16 09:10:17 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 08:59:57 UT on 16 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250316A (trigger 763808402.691648 / 250316375). The on-ground calculated location, using the Fermi GBM trigger data, is RA =… [View More]

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[vsnet-grb-info 37756] GRB 250315A/EP250315A: Fermi-GBM Sub-Threshold Detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39740 SUBJECT: GRB 250315A/EP250315A: Fermi-GBM Sub-Threshold Detection DATE: 25/03/15 23:01:42 GMT FROM: mariaedvige.ravasio(a)ru.nl M. E. Ravasio (Radboud Univ.), E. Burns (LSU) and P.G. Jonker (Radboud Univ.) report on behalf of the Fermi-GBM Team: Fermi-GBM had full spatial and temporal coverage of the transient GRB 250315A/EP250315A detected by EP (Peng et al., GCN 39731; Sun et al. GCN 39738), with optical counterpart (Quirola-Vasquez et al. GCN … [View More]

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[vsnet-grb-info 37755] GRB 250314A: EP-FXT afterglow detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39739 SUBJECT: GRB 250314A: EP-FXT afterglow detection DATE: 25/03/15 16:32:44 GMT FROM: Damien Turpin at CEA-Saclay <dturpin-astro(a)hotmail.com> D. Turpin, B. Cordier (CEA), H. Q. Cheng, H. N. Yang (NAO, CAS), P. Y. Han (WHU), W. Yuan (NAO, CAS) Y. Wang (PMO, CAS), Rui-Zhi Li (YNAO, CAS) on behalf of the SVOM and Einstein Probe teams We performed a follow-up observation of GRB 250314A (Wang et al., GCN 39719) with the Follow-up X-ray Telescope (… [View More]

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[vsnet-grb-info 37754] GRB 250314A: EP-FXT afterglow detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39739 SUBJECT: GRB 250314A: EP-FXT afterglow detection DATE: 25/03/15 16:32:44 GMT FROM: Damien Turpin at CEA-Saclay <dturpin-astro(a)hotmail.com> D. Turpin, B. Cordier (CEA), H. Q. Cheng, H. N. Yang (NAO, CAS), P. Y. Han (WHU), W. Yuan (NAO, CAS) Y. Wang (PMO, CAS), Rui-Zhi Li (YNAO, CAS) on behalf of the SVOM and Einstein Probe teams We performed a follow-up observation of GRB 250314A (Wang et al., GCN 39719) with the Follow-up X-ray Telescope (… [View More]

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[vsnet-grb-info 37753] EP250315a: refined analysis of the EP-WXT and EP-FXT observations
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39738 SUBJECT: EP250315a: refined analysis of the EP-WXT and EP-FXT observations DATE: 25/03/15 15:05:35 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> H.Sun (NAO, CAS), J. Q. Peng (IHEP, CAS), M. Q. Huang (USTC), W. X. Wang, W. D. Zhang (NAO, CAS) report on behalf of the Einstein Probe team: The X-ray transient EP250315a was detected by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Peng et al., GCN 39731). An … [View More]

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[vsnet-grb-info 37752] GRB 250314A: Swift/UVOT Upper Limits
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39737 SUBJECT: GRB 250314A: Swift/UVOT Upper Limits DATE: 25/03/15 14:40:53 GMT FROM: Mike Siegel at PSU/Swift MOC <mhs18(a)psu.edu> M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team: Swift/UVOT observed the field of GRB250314A (Wange et al., GCN 39719) for a total of 1.6 ks in the U-band from 5.7 ks to 7.4 ks after the SVOM/ECLAIRs detection. We detect no optical/UV source at the position of the infrared (Malesani et al., GCN Circ 39727) … [View More]

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[vsnet-grb-info 37751] GRB 250312B: GRBAlpha detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39736 SUBJECT: GRB 250312B: GRBAlpha detection DATE: 25/03/15 14:36:05 GMT FROM: Marianna Dafčíková at Masaryk University <500025(a)mail.muni.cz> M. Dafcikova, J. Ripa, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, … [View More]A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration. The long-duration GRB 250312B (Fermi/GBM detection: GCN 39692; Swift/BAT-GUANO detection: GCN 39708) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract). The detection was confirmed at the peak time 2025-03-12 20:36:57.4 UTC. The T90 duration measured by GRBAlpha is 7.0 s and the overall significance during T90 reaches 10 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB250312B_GCN.pdf All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume. View this GCN Circular online at https://gcn.nasa.gov/circulars/39736. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37750] GRB 250313.89 / Fermi trigger 763594063: bright OT AT 2025ehi detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39735 SUBJECT: GRB 250313.89 / Fermi trigger 763594063: bright OT AT 2025ehi detection DATE: 25/03/15 14:28:50 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> Ya.Kechin, V.Lipunov,N.Tyurina, E.Gorbovskoy, A.Kuznetsov, G.Antipov, D.Vlasenko,K.Zhirkov, P.Balanutsa, A.Chasovnikov, V.Topolev, V.Senik, K.Labzina (Lomonosov MSU), D.Buckley (SAAO), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico … [View More]

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[vsnet-grb-info 37749] GRB 250314A: Swift XRT Detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39734 SUBJECT: GRB 250314A: Swift XRT Detection DATE: 25/03/15 14:08:48 GMT FROM: Jamie Kennea at Penn State <jak51(a)psu.edu> J. A. Kennea (PSU), V. D'Elia (SSDC & INAF-OAR), P. A. Evans (Leicester) report on behalf of the Swift/XRT Team At 14:28UT on March 14, 2024 Swift began a Target-of-Opportunity observation of GRB 250314A, a SVOM ECLAIRs detected GRB (GCN #39719). Swift finds a uncatalogued point source inside the ECLAIRS error region at … [View More]

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[vsnet-grb-info 37748] EP250315a: optical counterpart candidate detected by Gemini North
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39733 SUBJECT: EP250315a: optical counterpart candidate detected by Gemini North DATE: 25/03/15 13:43:51 GMT FROM: Jonathan Quirola at Radboud University <jaquirola1990(a)gmail.com> J. A. Quirola-Vasquez (Radboud Univ.), P. G. Jonker (Radboud Univ.), D. B. Malesani (DAWN/NBI & Radboud Univ.), J. van Dalen (Radboud Univ.), A. Martin-Carrillo (UCD), A. J. Levan (Radboud Univ. & Warwick Univ.), A. van Hoof (Radboud Univ.), J. Sanchez-Sierras (… [View More]

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[vsnet-grb-info 37747] GRB 250314A: VLT/X-shooter dropout, redshift z ~ 7.3
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39732 SUBJECT: GRB 250314A: VLT/X-shooter dropout, redshift z ~ 7.3 DATE: 25/03/15 12:45:58 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> D. B. Malesani (DAWN/NBI and Radboud), G. Pugliese (API-UvA), J. P. U. Fynbo (DAWN/NBI), B. Schneider (LAM), V. D’Elia (SSDC and INAF-OAR), A. de Ugarte Postigo (LAM), L. Izzo (INAF-OACn and DARK/NBI), P. G. Jonker (Radboud), A. J. Levan (Radboud and Warwick), J. T. Palmerio (… [View More]CEA/Irfu), N. A. Rakotondrainibe (LAM), A. Saccardi (CEA/Irfu), N. R. Tanvir (U. Leicester), A. L. Thakur (INAF-IAPS), S. D. Vergani (CNRS, Obs. Paris/LUX), D. Xu (NAOC), Z.P. Zhu (NAOC) report on behalf of the Stargate collaboration: We observed the near-infrared candidate counterpart (Malesani et al., GCN 39727) of the long SVOM/ECLAIRs GRB 250314A (Wang et al., GCN 39719) at the ESO VLT, using the HAWK-I near-infrared imager (on UT4, Kueyen) and the X-shooter spectrograph (on UT3, Melipal). The object is well detected in the Y, J and H filters. HAWK-I observations started on 2025 Mar 15 at 05:23:28 UT (about 16.5 hr after the GRB). We measure preliminary AB magnitudes: Y = 23.2 +/- 0.15 J = 22.4 +/- 0.1 H = 22.5 +/- 0.1 For the spectra, the observation mid time was 2025 Mar 15.26 UT (about 17.4 hr after the GRB). The data cover the wavelength range 3000-21,000 AA and consist of 4 exposures of 1200 s each. In a preliminary reduction of the spectra, a faint continuum is confidently detected all across the NIR arm (down to 10,300 AA). Tentative signal is also seen in the very red end of the VIS arm, with a drop around 10,090 AA. While the S/N is too low to confidently identify individual metal absorption features, the break in the VIS is consistent with the onset of the Lyman forest (with possible contribution from damped Lyman-alpha absorption in the GRB host galaxy). The implied redshift is z ~ 7.3. The HAWK-I photometry is consistent with a break, rather than with a generically red shape of the continuum, given the red Y-J vs blue J-H color, consistent with the Y filter being partly dropped out. Assuming a power law model (no dust extinction), a fit to the available photometry provides a redshift z = 7.21 +0.18 -0.38 (1 sigma c.l.), fully consistent with the spectroscopic value. We acknowledge expert support from the ESO staff in Paranal. View this GCN Circular online at https://gcn.nasa.gov/circulars/39732. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37746] EP250315a: Einstein Probe detection of an X-ray transient
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39731 SUBJECT: EP250315a: Einstein Probe detection of an X-ray transient DATE: 25/03/15 07:33:28 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> J. Q. Peng (IHEP,CAS), M. Q. Huang (USTC), H. Sun, W. X. Wang, W. D. Zhang (NAO,CAS) report on behalf of the Einstein Probe team: We report on the detection of an X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP250315a. The … [View More]

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[vsnet-grb-info 37745] GRB 250226A: Mondy AZT-33IK and Koshka Zeiss-1000 Optical Upper Limits
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39730 SUBJECT: GRB 250226A: Mondy AZT-33IK and Koshka Zeiss-1000 Optical Upper Limits DATE: 25/03/15 07:21:33 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), E. Klunko (ISTP), A. Novichonok (KIAM), I. Nikolenko (INASAN), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of GRB 250226A (The Fermi GBM team, GCN 39479; V.Lipunov et. al, GCN 39481; Jiang et. al, … [View More]

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[vsnet-grb-info 37744] SVOM/MXT upper limit on GRB 250314A
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39729 SUBJECT: SVOM/MXT upper limit on GRB 250314A DATE: 25/03/15 07:13:31 GMT FROM: Diego Gotz at CEA <diego.gotz(a)cea.fr> D. Götz (CEA), F. Robinet (IJCLab), H. Goto (CEA), C. Plasse (CEA), P. Maggi (ObAS), M. Moita (CEA), C. van Hove (IJCLab) on behalf of the MXT team report: The field of GRB 250310A (Wange et al. GCN 39719, Li et al. 39728) was observed by MXT promptly after the SVOM slew starting at 12:59:55 UT, i.e. 193 s after ECLAIRs trigger.… [View More]

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[vsnet-grb-info 37743] GRB250314A: SVOM/VT upper limit
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39728 SUBJECT: GRB250314A: SVOM/VT upper limit DATE: 25/03/15 05:04:43 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> H.L. Li (NAOC), R.-Z. Li (YNAO, CAS), Y. Wang (PMO, CAS), J.X. Cao, D.F. Kong (GXU), L.P. Xin, Y. L. Qiu, C. Wu, Z.H. Yao, Y.N. Ma, X.H. Han, J. Wang, W.J. Xie, Y. Xu, H.B. Cai, J.Y. Wei (NAOC), J. Palmerio (CEA) report on behalf of the SVOM team: SVOM performed an automatic slew on the burst triggered by SVOM/ECLAIRs (Wang et al., GCN … [View More]

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[vsnet-grb-info 37742] GRB 250314A: NOT near-infrared candidate counterpart
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39727 SUBJECT: GRB 250314A: NOT near-infrared candidate counterpart DATE: 25/03/15 04:30:21 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani(a)astro.ru.nl> D. B. Malesani (DAWN/NBI), G. Corcoran (UCD), L. Izzo (INAF/OAC and DARK/NBI), B. Schneider (LAM), J. Palmerio (CEA/Irfu), A. Henderson de la Fuente (NOT) report on behalf of a larger collaboration: We observed the field of the SVOM GRB 250314A (Wang et al., GCN 39719) … [View More]

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[vsnet-grb-info 37741] GRB 250313A: Fermi GBM Detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39726 SUBJECT: GRB 250313A: Fermi GBM Detection DATE: 25/03/15 02:17:47 GMT FROM: eliza.neights(a)gmail.com Eliza Neights (George Washington University, NASA Goddard Space Flight Center), M. Godwin (UAH), C. Meegan (UAH) and O.J. Roberts (USRA) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 14:34:33.69 UT on 13 March 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250313A (trigger 763569278/250313607), which was … [View More]

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[vsnet-grb-info 37740] GRB 250313A: CALET Gamma-Ray Burst Monitor detection
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39725 SUBJECT: GRB 250313A: CALET Gamma-Ray Burst Monitor detection DATE: 25/03/15 01:55:09 GMT FROM: Yuta Kawakubo at Aoyama Gakuin University <kawakubo(a)phys.aoyama.ac.jp> K. Yamaoka (Nagoya U), A. Yoshida, T. Sakamoto, S. Sugita, Y. Kawakubo (AGU), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. … [View More]

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[vsnet-grb-info 37739] GRB 250312B: Fermi GBM Observation
by GCN Circulars 15 Mar '25

15 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39724 SUBJECT: GRB 250312B: Fermi GBM Observation DATE: 25/03/15 00:56:42 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 20:36:56.64 UT on 12 March 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250312B (trigger 763504621/250312859), which was also localized by Swift/BAT-GUANO (J. DeLaunay et al. 2025, GCN 39708).… [View More]

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[vsnet-grb-info 37738] GRB 250313A: Swift-XRT observations
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39723 SUBJECT: GRB 250313A: Swift-XRT observations DATE: 25/03/14 23:06:25 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> M. A. Williams (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), P. D'Avanzo (INAF-OAB), S. Dichiara (PSU), J.A. Kennea (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed … [View More]follow-up observations of the Fermi/LAT-detected burst GRB 250313A, collecting 6.3 ks of Photon Counting (PC) mode data between T0+30.7 ks and T0+82.7 ks. Seven uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 1: RA (J2000.0): 278.5986 = 18:34:23.66 Dec (J2000.0): +53.8117 = +53:48:42.1 Error: 5.7 arcsec (radius, 90% conf.) Count-rate: (3.20 [+1.07, -0.89])e-3 ct s^-1 Distance: 360 arcsec from Fermi/LAT position. Flux: (1.13 [+0.38, -0.32])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 2: RA (J2000.0): 278.4773 = 18:33:54.54 Dec (J2000.0): +53.6792 = +53:40:45.1 Error: 5.9 arcsec (radius, 90% conf.) Count-rate: (1.23 [+0.71, -0.54])e-3 ct s^-1 Distance: 184 arcsec from Fermi/LAT position. Flux: (5.1 [+2.9, -2.2])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 3: RA (J2000.0): 278.7435 = 18:34:58.45 Dec (J2000.0): +53.8112 = +53:48:40.2 Error: 6.1 arcsec (radius, 90% conf.) Count-rate: (1.19 [+0.90, -0.67])e-3 ct s^-1 Distance: 560 arcsec from Fermi/LAT position. Flux: (2.6 [+2.0, -1.5])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 4: RA (J2000.0): 278.7131 = 18:34:51.13 Dec (J2000.0): +53.8208 = +53:49:14.7 Error: 6.9 arcsec (radius, 90% conf.) Count-rate: (2.16 [+0.95, -0.76])e-3 ct s^-1 Distance: 532 arcsec from Fermi/LAT position. Flux: (2.38 [+1.04, -0.83])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 5: RA (J2000.0): 278.5290 = 18:34:6.96 Dec (J2000.0): +53.8678 = +53:52:04.2 Error: 8.1 arcsec (radius, 90% conf.) Count-rate: (1.57 [+0.84, -0.65])e-3 ct s^-1 Distance: 532 arcsec from Fermi/LAT position. Flux: (6.4 [+3.4, -2.6])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 6: RA (J2000.0): 278.5496 = 18:34:11.90 Dec (J2000.0): +53.7202 = +53:43:12.8 Error: 5.7 arcsec (radius, 90% conf.) Count-rate: (1.35 [+0.73, -0.55])e-3 ct s^-1 Distance: 41 arcsec from Fermi/LAT position. Flux: (8.6 [+4.7, -3.5])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 7: RA (J2000.0): 278.6648 = 18:34:39.55 Dec (J2000.0): +53.6612 = +53:39:40.2 Error: 7.4 arcsec (radius, 90% conf.) Count-rate: (7.5 [+6.0, -4.6])e-4 ct s^-1 Distance: 356 arcsec from Fermi/LAT position. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021822. This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/39723. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37737] GRB250314A: SVOM/VT lack of bright optical candidate from VHF data
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39722 SUBJECT: GRB250314A: SVOM/VT lack of bright optical candidate from VHF data DATE: 25/03/14 16:16:43 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> J. T. Palmerio (CEA), L.P. Xin (NAOC), S. D. Vergani (Obs. Paris), Y. Wang (PMO, CAS), Rui-Zhi Li (YNAO, CAS), Y. L. Qiu, H.L. Li., C. Wu, Z.H. Yao, Y.N. Ma, X.H. Han, H.B. Cai, J.Y. Wei (NAOC), Y. Canton, M. Garnichey, (Obs. Paris) report on behalf of the SVOM/VT team: After the trigger by SVOM/… [View More]

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[vsnet-grb-info 37736] Konus-Wind detection of GRB 250313A
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39721 SUBJECT: Konus-Wind detection of GRB 250313A DATE: 25/03/14 16:07:45 GMT FROM: Dmitry Frederiks at Ioffe Institute <fred(a)mail.ioffe.ru> D. Frederiks, A.Lysenko, A. Ridnaia, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report: The long GRB 250313A (Fermi-GBM detection: Fermi GBM team, GCN 39703; BALROG localization: Preis & Greiner, GCN 39704; Fermi-LAT detection: Di Lalla et al., GCN 39711; … [View More]

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[vsnet-grb-info 37735] Konus-Wind detection of GRB 250308A
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39720 SUBJECT: Konus-Wind detection of GRB 250308A DATE: 25/03/14 15:54:17 GMT FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru> D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, A. Tsvetkova, M. Ulanov, and T. Cline on behalf of the Konus-Wind team, report: The short-duration GRB 250308A (SVOM-GRM detection: Wang et al., GCNs 39632, 39636; IPN triangulation: Kozyrev et al., GCN 39653; CALET-GBM detection: Kawakubo et al., GCN 39663; … [View More]

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[vsnet-grb-info 37734] GRB 250314A: SVOM detection of a burst
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39719 SUBJECT: GRB 250314A: SVOM detection of a burst DATE: 25/03/14 14:12:08 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Y. Wang (PMO, CAS), Rui-Zhi Li (YNAO, CAS), M. Brunet, H. Yang (IRAP), T.Maiolino (LUPM) on behalf of the SVOM mission team. SVOM/ECLAIRs triggered on the gamma-ray burst GRB 250314A (SVOM burst-id sb25031405) starting at 2025-03-14T12:56:42 UTC (Tb). The following trigger information was received on the ground with low latency … [View More]

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[vsnet-grb-info 37733] EP250311a/GRB 250311A: Correction to EP-WXT detection time
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39718 SUBJECT: EP250311a/GRB 250311A: Correction to EP-WXT detection time DATE: 25/03/14 08:43:16 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> X. Mao (NAO, CAS), Y. J. Zhang (THU), Y. L. Hua (PMO, CAS), Z. X. Ling (NAO, CAS) report on behalf of the Einstein Probe team: The detection time for the transient EP250311a/GRB 250311A reported in GCN 39664 is incorrect: the corrected EP-WXT detection time is 2025-03-11T01:55:13 (UTC). We apologize for … [View More]

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[vsnet-grb-info 37732] GRB 250313B: SVOM/GRM observation of a soft bright short burst
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39717 SUBJECT: GRB 250313B: SVOM/GRM observation of a soft bright short burst DATE: 25/03/14 07:37:23 GMT FROM: wenlongzhang2018(a)163.com SVOM/GRM team: Wen-Long Zhang, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Nicolas Dagoneau (CEA), Maria-Grazia Bernardini (INAF-OAB), Jean-Luc Atteia (IRAP), Frédéric Piron (LUPM) Report on behalf of the SVOM team: SVOM/GRM was triggered in-flight by GRB 250313B … [View More]

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[vsnet-grb-info 37731] GRB 250313A: SVOM/GRM observation of a bright long burst
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39716 SUBJECT: GRB 250313A: SVOM/GRM observation of a bright long burst DATE: 25/03/14 07:18:32 GMT FROM: Chenwei Wang at IHEP <cwwang(a)ihep.ac.cn> SVOM/GRM team: Chen-Wei Wang, Wen-Jun Tan, Yan-Qiu Zhang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Bertrand Cordier, Nicolas Dagoneau (CEA), Maria-Grazia Bernardini (INAF-OAB), Jean-Luc Atteia (IRAP), Frédéric Piron (LUPM) Report on behalf of the SVOM team: … [View More]

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[vsnet-grb-info 37730] LIGO/Virgo/KAGRA S250206dm & FRB 20250206A: Nondetection of Repeating Bursts from FRB 20250206A with FAST
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39715 SUBJECT: LIGO/Virgo/KAGRA S250206dm & FRB 20250206A: Nondetection of Repeating Bursts from FRB 20250206A with FAST DATE: 25/03/14 03:56:23 GMT FROM: gaosj(a)smail.nju.edu.cn Shi-Jie Gao (NJU), Xiang-Dong Li (NJU), Yi-Xuan Shao (NJU), Ping Zhou (NJU) and Pei Wang (NAOC) report: Following the detection of the binary compact object merger event S250206dm by the LIGO-Virgo-KAGRA Collaboration (GCN [39175](https://gcn.nasa.gov/circulars/39175)), the … [View More]

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[vsnet-grb-info 37729] GRB 250313A: AstroSat CZTI detection of a bright long burst
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39714 SUBJECT: GRB 250313A: AstroSat CZTI detection of a bright long burst DATE: 25/03/14 03:34:39 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> A. Dasgupta (BITS Pilani, Hyderabad), G. Waratkar (IITB), M. Tembhurnikar (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat … [View More]

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[vsnet-grb-info 37728] IceCube-250309A: MASTER detection of J140105.33-091631.6 blazar flare with Zhirkov effect
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39713 SUBJECT: IceCube-250309A: MASTER detection of J140105.33-091631.6 blazar flare with Zhirkov effect DATE: 25/03/14 02:36:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> K. Labzina, K.Zhirkov, V.Lipunov, E.Gorbovskoy, A.Kuznetsov, G.Antipov, D.Vlasenko, A.Kuznetsov, N.Tyurina, P.Balanutsa, A.Chasovnikov, V.Topolev, Ya.Kechin, V.Senik (Lomonosov MSU), O.Gress, N.Budnev, O.Ershova (ISU), C.Francile, F. … [View More]

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[vsnet-grb-info 37727] Fermi trigger No 763581136: Global MASTER-Net observations report
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39712 SUBJECT: Fermi trigger No 763581136: Global MASTER-Net observations report DATE: 25/03/14 02:16:43 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, … [View More]F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB250313.74 (trigger No 763581136,18h 42m 24.00s , +00d 58m 58.8s, R=6.27) errorbox 27520 sec after notice time and 27564 sec after trigger time at 2025-03-14 01:31:35 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 56 deg. The sun altitude is -21.3 deg. The galactic latitude b = 2 deg., longitude l = 33 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2811247 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 27594 | 2025-03-14 01:31:35 | MASTER-Kislovodsk | (18h 39m 04.76s , +01d 26m 30.2s) | C | 60 | 17.6 | 27993 | 2025-03-14 01:38:13 | MASTER-Kislovodsk | (18h 38m 47.91s , -00d 27m 18.2s) | C | 60 | 17.6 | 28073 | 2025-03-14 01:39:33 | MASTER-Kislovodsk | (18h 40m 24.11s , +03d 18m 32.2s) | C | 60 | 17.1 | 28152 | 2025-03-14 01:40:53 | MASTER-Kislovodsk | (18h 23m 49.44s , +01d 26m 56.6s) | C | 60 | 17.9 | 28232 | 2025-03-14 01:42:12 | MASTER-Kislovodsk | (18h 25m 16.69s , +03d 20m 34.7s) | C | 60 | 17.3 | 28312 | 2025-03-14 01:43:32 | MASTER-Kislovodsk | (18h 23m 35.70s , -00d 26m 52.0s) | C | 60 | 18.0 | 28391 | 2025-03-14 01:44:52 | MASTER-Kislovodsk | (18h 43m 03.83s , +05d 12m 24.2s) | C | 60 | 17.0 | 28471 | 2025-03-14 01:46:11 | MASTER-Kislovodsk | (18h 39m 53.31s , -02d 21m 38.9s) | C | 60 | 16.6 | 28551 | 2025-03-14 01:47:31 | MASTER-Kislovodsk | (18h 27m 53.45s , +05d 14m 26.6s) | C | 60 | 17.4 | 28630 | 2025-03-14 01:48:51 | MASTER-Kislovodsk | (18h 54m 10.70s , +01d 26m 14.1s) | C | 60 | 17.5 | 28710 | 2025-03-14 01:50:10 | MASTER-Kislovodsk | (18h 53m 58.89s , -00d 29m 39.5s) | C | 60 | 16.4 | 28791 | 2025-03-14 01:51:31 | MASTER-Kislovodsk | (18h 55m 40.16s , +03d 20m 06.9s) | C | 60 | 17.2 | 28870 | 2025-03-14 01:52:51 | MASTER-Kislovodsk | (18h 55m 09.08s , -02d 21m 42.2s) | C | 60 | 16.7 | 28950 | 2025-03-14 01:54:11 | MASTER-Kislovodsk | (18h 24m 37.00s , -02d 20m 34.3s) | C | 60 | 17.6 | 29030 | 2025-03-14 01:55:30 | MASTER-Kislovodsk | (18h 31m 39.50s , +07d 07m 00.6s) | C | 60 | 16.8 | 29110 | 2025-03-14 01:56:50 | MASTER-Kislovodsk | (18h 42m 08.14s , -04d 15m 24.0s) | C | 60 | 16.6 | 29269 | 2025-03-14 01:59:30 | MASTER-Kislovodsk | (18h 46m 57.68s , +07d 08m 43.9s) | C | 60 | 17.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/39712. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37726] GRB 250313A: Fermi-LAT detection
by GCN Circulars 14 Mar '25

14 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39711 SUBJECT: GRB 250313A: Fermi-LAT detection DATE: 25/03/14 00:13:09 GMT FROM: Rahul Gupta at NASA GSFC <rahul.gupta(a)nasa.gov> N. Di Lalla (Stanford Univ.), R. Gupta (NASA GSFC), and M. Arimoto (Kanazawa Univ.) report on behalf of the Fermi-LAT Collaboration: On March 13, 2025, Fermi-LAT detected high-energy emission from GRB 250313A, which was also detected by Fermi-GBM (trigger 763569278 / 250313607, GCN 39703). The best LAT on-ground … [View More]

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[vsnet-grb-info 37725] GRB 250313A: Swift ToO observations
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39710 SUBJECT: GRB 250313A: Swift ToO observations DATE: 25/03/13 23:18:11 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/LAT GRB 250313A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021822 Any uncatalogued X-ray sources detected in this analysis will be reported on … [View More]

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[vsnet-grb-info 37724] EP250304a: Pan-STARRS r and i-band imaging and photometry
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39709 SUBJECT: EP250304a: Pan-STARRS r and i-band imaging and photometry DATE: 25/03/13 20:31:31 GMT FROM: James Gillanders at University of Oxford <jhgillanders.astro(a)gmail.com> J. H. Gillanders (Oxford), M. Huber, K. C. Chambers (IfA, Univ. Hawaii), S. J. Smartt, K. W. Smith, S. Srivastav (Oxford), M. Nicholl, D. Young, M. Fulton (QUB), T.-W. Chen (NCU, Taiwan) A. S. B. Schultz, T. de Boer, J. Fairlamb, G. Paek, C. C. Lin, T. Lowe, E. Magnier, P. … [View More]

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[vsnet-grb-info 37723] GRB 250312B: Swift/BAT-GUANO localization skymap of a burst
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39708 SUBJECT: GRB 250312B: Swift/BAT-GUANO localization skymap of a burst DATE: 25/03/13 19:55:40 GMT FROM: Jimmy DeLaunay at Penn State <delauj2(a)gmail.com> James DeLaunay (PSU), Samuele Ronchini (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 250312B onboard (T0: 2025-03-12T20:36:56.64 UTC, Fermi trig 763504621) The Fermi notice, distributed in … [View More]near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 12.4 in a 8.192 s analysis time bin, starting at T0 - 2.048 s. Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2025. in prep) The 90% credible area is 10,136 deg2 and the 50% credible area is 2,853 deg2. The integrated probability inside the coded field of view is 1%. The NITRATES skymap is consistent with the Fermi localization reported in the final position notice (GCN 39692). The combined Fermi/GBM+NITRATES 90% credible area is 1,014 deg2 and the 50% credible area is 223 deg2. A plot of the probability skymap can be viewed here: [skymap_plot](https://guano.swift.psu.edu/trigger_report?id=763504651/#:~:te… The probability skymap and joint skymap files can be downloaded from the links here [skymap_fits_file](https://guano.swift.psu.edu/files/763504651/0_n_PROBMAP) [joint_skymap_fits_file](https://guano.swift.psu.edu/files/763504651/0_n_JOI… Instructions on how to read and manipulate this map can be found here: https://guano.swift.psu.edu/documentation More details about this burst can be found on the trigger report page here: https://guano.swift.psu.edu/trigger_report?id=763504651 GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/ View this GCN Circular online at https://gcn.nasa.gov/circulars/39708. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37722] EP trigger ID 01709061302: Lick/Kast spectroscopy with the 3 m Shane telescope
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39707 SUBJECT: EP trigger ID 01709061302: Lick/Kast spectroscopy with the 3 m Shane telescope DATE: 25/03/13 19:38:57 GMT FROM: Weikang Zheng at UC Berkeley <weikang(a)berkeley.edu> WeiKang Zheng, Thomas G. Brink, Alexei V. Filippenko (UCB), Andy Skemer, Naunet Leonhardes-Barboza, Jordan Forman, Mayra Gutierrez, Isabelle Jones, Ravjit Kaur, Petra Mengistu, Avi Patel, Anavi Uppal, Nicole Wolff, and Michele Woodland (UCSC), report on behalf of the … [View More]

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[vsnet-grb-info 37721] Fermi GRB 250313A: Global MASTER-Net observations report
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39706 SUBJECT: Fermi GRB 250313A: Global MASTER-Net observations report DATE: 25/03/13 19:01:16 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta,… [View More] R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 250313A ( Fermi GBM team, GCN 39703) errorbox 6499 sec after notice time and 6531 sec after trigger time at 2025-03-13 16:23:25 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 64 deg. The sun altitude is -40.5 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 250313A errorbox 13836 sec after notice time and 13867 sec after trigger time at 2025-03-13 18:25:41 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 79 deg. The sun altitude is -34.2 deg. The galactic latitude b = 25 deg., longitude l = 80 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2811112 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 6534 | 2025-03-13 16:23:25 | MASTER-Tunka | (18h 26m 19.46s , +51d 36m 23.5s) | C | 5 | 15.9 | 6539 | 2025-03-13 16:23:25 | MASTER-Tunka | (18h 26m 19.46s , +51d 36m 23.4s) | C | 15 | 16.6 | Coadd 6553 | 2025-03-13 16:23:43 | MASTER-Tunka | (18h 26m 25.64s , +51d 35m 22.8s) | C | 5 | 16.1 | 6570 | 2025-03-13 16:24:01 | MASTER-Tunka | (18h 26m 19.56s , +51d 34m 23.6s) | C | 5 | 16.1 | 6588 | 2025-03-13 16:24:18 | MASTER-Tunka | (18h 26m 25.38s , +51d 34m 41.3s) | C | 5 | 16.0 | 6593 | 2025-03-13 16:24:18 | MASTER-Tunka | (18h 26m 25.37s , +51d 34m 41.2s) | C | 15 | 16.7 | Coadd 6607 | 2025-03-13 16:24:37 | MASTER-Tunka | (18h 26m 22.64s , +51d 36m 18.7s) | C | 5 | 16.1 | 6624 | 2025-03-13 16:24:54 | MASTER-Tunka | (18h 26m 22.61s , +51d 34m 53.1s) | C | 5 | 16.0 | 6645 | 2025-03-13 16:25:14 | MASTER-Tunka | (18h 26m 24.91s , +51d 36m 10.2s) | C | 10 | 16.4 | 6655 | 2025-03-13 16:25:14 | MASTER-Tunka | (18h 26m 24.93s , +51d 36m 10.4s) | C | 30 | 16.9 | Coadd 6669 | 2025-03-13 16:25:37 | MASTER-Tunka | (18h 26m 20.02s , +51d 35m 25.5s) | C | 10 | 16.3 | 6693 | 2025-03-13 16:26:02 | MASTER-Tunka | (18h 26m 19.41s , +51d 36m 26.4s) | C | 10 | 16.4 | 6718 | 2025-03-13 16:26:26 | MASTER-Tunka | (18h 26m 25.99s , +51d 35m 26.4s) | C | 10 | 16.4 | 6728 | 2025-03-13 16:26:26 | MASTER-Tunka | (18h 26m 26.01s , +51d 35m 25.7s) | C | 30 | 17.0 | Coadd 6742 | 2025-03-13 16:26:50 | MASTER-Tunka | (18h 26m 21.05s , +51d 34m 26.9s) | C | 10 | 16.5 | 6763 | 2025-03-13 16:27:12 | MASTER-Tunka | (18h 26m 26.84s , +51d 34m 44.6s) | C | 10 | 16.5 | 6786 | 2025-03-13 16:27:34 | MASTER-Tunka | (18h 26m 23.48s , +51d 36m 23.8s) | C | 10 | 16.5 | 6796 | 2025-03-13 16:27:34 | MASTER-Tunka | (18h 26m 23.48s , +51d 36m 23.5s) | C | 30 | 17.1 | Coadd 6809 | 2025-03-13 16:27:57 | MASTER-Tunka | (18h 26m 23.42s , +51d 34m 40.4s) | C | 10 | 16.5 | 6834 | 2025-03-13 16:28:22 | MASTER-Tunka | (18h 26m 26.91s , +51d 36m 01.6s) | C | 10 | 16.5 | 8874 | 2025-03-13 17:02:22 | MASTER-Tunka | (18h 26m 31.04s , +51d 36m 22.5s) | C | 10 | 16.9 | 8884 | 2025-03-13 17:02:22 | MASTER-Tunka | (18h 26m 31.07s , +51d 36m 23.1s) | C | 30 | 17.5 | Coadd 8919 | 2025-03-13 17:02:22 | MASTER-Tunka | (18h 26m 31.07s , +51d 36m 22.8s) | C | 100 | 18.2 | Coadd 9009 | 2025-03-13 17:02:22 | MASTER-Tunka | (18h 26m 31.05s , +51d 36m 22.9s) | C | 280 | 18.9 | Coadd 9139 | 2025-03-13 17:02:22 | MASTER-Tunka | (18h 26m 31.07s , +51d 36m 23.0s) | C | 540 | 19.2 | Coadd 8899 | 2025-03-13 17:02:47 | MASTER-Tunka | (18h 26m 29.42s , +51d 37m 23.3s) | C | 10 | 16.9 | 8922 | 2025-03-13 17:03:10 | MASTER-Tunka | (18h 26m 35.91s , +51d 36m 23.6s) | C | 10 | 16.9 | 8945 | 2025-03-13 17:03:33 | MASTER-Tunka | (18h 26m 30.59s , +51d 35m 24.2s) | C | 10 | 16.8 | 8955 | 2025-03-13 17:03:33 | MASTER-Tunka | (18h 26m 30.61s , +51d 35m 24.4s) | C | 30 | 17.5 | Coadd 8978 | 2025-03-13 17:04:07 | MASTER-Tunka | (18h 26m 36.90s , +51d 35m 42.9s) | C | 10 | 16.8 | 9010 | 2025-03-13 17:04:38 | MASTER-Tunka | (18h 26m 33.86s , +51d 37m 10.4s) | C | 10 | 16.9 | 9032 | 2025-03-13 17:05:00 | MASTER-Tunka | (18h 26m 33.89s , +51d 35m 44.0s) | C | 10 | 16.8 | 9042 | 2025-03-13 17:05:00 | MASTER-Tunka | (18h 26m 33.90s , +51d 35m 44.3s) | C | 30 | 17.6 | Coadd 9055 | 2025-03-13 17:05:23 | MASTER-Tunka | (18h 26m 37.63s , +51d 37m 14.3s) | C | 10 | 16.9 | 9091 | 2025-03-13 17:06:00 | MASTER-Tunka | (18h 26m 30.94s , +51d 36m 27.3s) | C | 10 | 16.9 | 9113 | 2025-03-13 17:06:21 | MASTER-Tunka | (18h 26m 31.10s , +51d 37m 28.0s) | C | 10 | 16.9 | 9123 | 2025-03-13 17:06:21 | MASTER-Tunka | (18h 26m 31.13s , +51d 37m 28.4s) | C | 30 | 17.5 | Coadd 9138 | 2025-03-13 17:06:46 | MASTER-Tunka | (18h 26m 37.27s , +51d 36m 28.0s) | C | 10 | 17.0 | 9161 | 2025-03-13 17:07:09 | MASTER-Tunka | (18h 26m 30.85s , +51d 35m 29.1s) | C | 10 | 16.9 | 9194 | 2025-03-13 17:07:42 | MASTER-Tunka | (18h 26m 36.43s , +51d 35m 41.8s) | C | 10 | 16.9 | 9204 | 2025-03-13 17:07:42 | MASTER-Tunka | (18h 26m 36.44s , +51d 35m 41.9s) | C | 30 | 17.6 | Coadd 9218 | 2025-03-13 17:08:06 | MASTER-Tunka | (18h 26m 34.84s , +51d 37m 14.2s) | C | 10 | 16.8 | 9240 | 2025-03-13 17:08:28 | MASTER-Tunka | (18h 26m 34.84s , +51d 35m 31.0s) | C | 10 | 16.8 | 9263 | 2025-03-13 17:08:51 | MASTER-Tunka | (18h 26m 37.58s , +51d 37m 22.7s) | C | 10 | 16.8 | 9273 | 2025-03-13 17:08:51 | MASTER-Tunka | (18h 26m 37.55s , +51d 37m 22.5s) | C | 30 | 17.5 | Coadd 9287 | 2025-03-13 17:09:15 | MASTER-Tunka | (18h 26m 31.18s , +51d 36m 32.0s) | C | 10 | 16.9 | 9309 | 2025-03-13 17:09:37 | MASTER-Tunka | (18h 26m 33.16s , +51d 37m 32.2s) | C | 10 | 16.8 | 9331 | 2025-03-13 17:09:59 | MASTER-Tunka | (18h 26m 38.97s , +51d 36m 31.6s) | C | 10 | 16.8 | 9341 | 2025-03-13 17:09:59 | MASTER-Tunka | (18h 26m 38.95s , +51d 36m 32.2s) | C | 30 | 17.4 | Coadd 9369 | 2025-03-13 17:10:38 | MASTER-Tunka | (18h 26m 32.93s , +51d 35m 33.1s) | C | 10 | 16.8 | 9393 | 2025-03-13 17:11:02 | MASTER-Tunka | (18h 26m 39.10s , +51d 35m 41.4s) | C | 10 | 16.8 | 9416 | 2025-03-13 17:11:25 | MASTER-Tunka | (18h 26m 35.66s , +51d 37m 29.0s) | C | 10 | 16.9 | 9426 | 2025-03-13 17:11:25 | MASTER-Tunka | (18h 26m 35.67s , +51d 37m 29.1s) | C | 30 | 17.6 | Coadd 9439 | 2025-03-13 17:11:47 | MASTER-Tunka | (18h 26m 35.80s , +51d 35m 40.3s) | C | 10 | 16.8 | 9461 | 2025-03-13 17:12:09 | MASTER-Tunka | (18h 26m 38.43s , +51d 37m 27.2s) | C | 10 | 16.8 | 9485 | 2025-03-13 17:12:34 | MASTER-Tunka | (18h 26m 32.01s , +51d 36m 36.8s) | C | 10 | 16.9 | 9495 | 2025-03-13 17:12:34 | MASTER-Tunka | (18h 26m 31.99s , +51d 36m 36.9s) | C | 30 | 17.6 | Coadd 9509 | 2025-03-13 17:12:57 | MASTER-Tunka | (18h 26m 33.59s , +51d 37m 37.5s) | C | 10 | 16.9 | 9532 | 2025-03-13 17:13:20 | MASTER-Tunka | (18h 26m 38.97s , +51d 36m 37.6s) | C | 10 | 16.9 | 9558 | 2025-03-13 17:13:46 | MASTER-Tunka | (18h 26m 32.63s , +51d 35m 37.9s) | C | 10 | 16.8 | 9568 | 2025-03-13 17:13:46 | MASTER-Tunka | (18h 26m 32.61s , +51d 35m 38.5s) | C | 30 | 17.6 | Coadd 9587 | 2025-03-13 17:14:15 | MASTER-Tunka | (18h 26m 39.27s , +51d 35m 40.7s) | C | 10 | 16.9 | 9613 | 2025-03-13 17:14:41 | MASTER-Tunka | (18h 26m 36.53s , +51d 37m 18.0s) | C | 10 | 16.8 | 9637 | 2025-03-13 17:15:05 | MASTER-Tunka | (18h 26m 36.60s , +51d 36m 00.4s) | C | 10 | 16.7 | 9647 | 2025-03-13 17:15:05 | MASTER-Tunka | (18h 26m 36.62s , +51d 36m 00.8s) | C | 30 | 17.4 | Coadd 9660 | 2025-03-13 17:15:28 | MASTER-Tunka | (18h 26m 40.68s , +51d 37m 37.4s) | C | 10 | 16.6 | 9681 | 2025-03-13 17:15:50 | MASTER-Tunka | (18h 26m 33.64s , +51d 36m 41.2s) | C | 10 | 16.6 | 9705 | 2025-03-13 17:16:14 | MASTER-Tunka | (18h 26m 34.47s , +51d 37m 42.4s) | C | 10 | 16.7 | 9715 | 2025-03-13 17:16:14 | MASTER-Tunka | (18h 26m 34.48s , +51d 37m 42.4s) | C | 30 | 17.4 | Coadd 9730 | 2025-03-13 17:16:38 | MASTER-Tunka | (18h 26m 39.57s , +51d 36m 42.1s) | C | 10 | 16.8 | 9753 | 2025-03-13 17:17:01 | MASTER-Tunka | (18h 26m 33.48s , +51d 35m 43.6s) | C | 10 | 16.8 | 9783 | 2025-03-13 17:17:31 | MASTER-Tunka | (18h 26m 39.45s , +51d 35m 47.0s) | C | 10 | 16.7 | 9793 | 2025-03-13 17:17:31 | MASTER-Tunka | (18h 26m 39.39s , +51d 35m 48.8s) | C | 30 | 17.5 | Coadd 9805 | 2025-03-13 17:17:53 | MASTER-Tunka | (18h 26m 37.41s , +51d 37m 20.4s) | C | 10 | 16.8 | 9828 | 2025-03-13 17:18:16 | MASTER-Tunka | (18h 26m 37.46s , +51d 36m 02.4s) | C | 10 | 16.8 | 9855 | 2025-03-13 17:18:43 | MASTER-Tunka | (18h 26m 41.32s , +51d 37m 31.8s) | C | 10 | 16.8 | 9865 | 2025-03-13 17:18:43 | MASTER-Tunka | (18h 26m 41.29s , +51d 37m 33.2s) | C | 30 | 17.4 | Coadd 9877 | 2025-03-13 17:19:05 | MASTER-Tunka | (18h 26m 34.82s , +51d 36m 45.9s) | C | 10 | 16.8 | 9904 | 2025-03-13 17:19:32 | MASTER-Tunka | (18h 26m 33.93s , +51d 37m 47.4s) | C | 10 | 16.8 | 9928 | 2025-03-13 17:19:57 | MASTER-Tunka | (18h 26m 40.06s , +51d 36m 46.9s) | C | 10 | 16.9 | 9938 | 2025-03-13 17:19:57 | MASTER-Tunka | (18h 26m 40.07s , +51d 36m 47.3s) | C | 30 | 17.6 | Coadd 9952 | 2025-03-13 17:20:20 | MASTER-Tunka | (18h 26m 35.06s , +51d 35m 48.2s) | C | 10 | 16.9 | 9977 | 2025-03-13 17:20:45 | MASTER-Tunka | (18h 26m 41.26s , +51d 36m 10.4s) | C | 10 | 16.8 | 9999 | 2025-03-13 17:21:07 | MASTER-Tunka | (18h 26m 38.25s , +51d 37m 36.4s) | C | 10 | 16.8 | 10009 | 2025-03-13 17:21:07 | MASTER-Tunka | (18h 26m 38.23s , +51d 37m 36.5s) | C | 30 | 17.5 | Coadd 10021 | 2025-03-13 17:21:29 | MASTER-Tunka | (18h 26m 38.20s , +51d 36m 19.4s) | C | 10 | 16.9 | 10045 | 2025-03-13 17:21:53 | MASTER-Tunka | (18h 26m 41.29s , +51d 37m 25.1s) | C | 10 | 16.8 | 10068 | 2025-03-13 17:22:17 | MASTER-Tunka | (18h 26m 36.40s , +51d 36m 53.4s) | C | 10 | 16.9 | 10078 | 2025-03-13 17:22:17 | MASTER-Tunka | (18h 26m 36.34s , +51d 36m 52.3s) | C | 30 | 17.5 | Coadd 10091 | 2025-03-13 17:22:39 | MASTER-Tunka | (18h 26m 35.75s , +51d 37m 52.4s) | C | 10 | 16.7 | 10118 | 2025-03-13 17:23:06 | MASTER-Tunka | (18h 26m 42.28s , +51d 36m 52.8s) | C | 10 | 16.8 | 10140 | 2025-03-13 17:23:29 | MASTER-Tunka | (18h 26m 35.52s , +51d 35m 53.7s) | C | 10 | 16.8 | 10150 | 2025-03-13 17:23:29 | MASTER-Tunka | (18h 26m 35.53s , +51d 35m 53.4s) | C | 30 | 17.4 | Coadd 10166 | 2025-03-13 17:23:54 | MASTER-Tunka | (18h 26m 40.98s , +51d 36m 05.8s) | C | 10 | 16.8 | 10189 | 2025-03-13 17:24:17 | MASTER-Tunka | (18h 26m 38.98s , +51d 37m 47.3s) | C | 10 | 16.8 | 10211 | 2025-03-13 17:24:39 | MASTER-Tunka | (18h 26m 39.03s , +51d 36m 22.3s) | C | 10 | 16.8 | 10221 | 2025-03-13 17:24:39 | MASTER-Tunka | (18h 26m 39.04s , +51d 36m 22.5s) | C | 30 | 17.4 | Coadd 10235 | 2025-03-13 17:25:03 | MASTER-Tunka | (18h 26m 41.70s , +51d 37m 38.1s) | C | 10 | 16.8 | 10257 | 2025-03-13 17:25:26 | MASTER-Tunka | (18h 26m 36.78s , +51d 36m 56.0s) | C | 10 | 16.8 | 10281 | 2025-03-13 17:25:50 | MASTER-Tunka | (18h 26m 36.93s , +51d 37m 57.5s) | C | 10 | 16.8 | 10291 | 2025-03-13 17:25:50 | MASTER-Tunka | (18h 26m 36.94s , +51d 37m 57.5s) | C | 30 | 17.5 | Coadd 10305 | 2025-03-13 17:26:13 | MASTER-Tunka | (18h 26m 43.13s , +51d 36m 57.2s) | C | 10 | 16.8 | 10329 | 2025-03-13 17:26:38 | MASTER-Tunka | (18h 26m 37.01s , +51d 35m 58.4s) | C | 10 | 16.8 | 10352 | 2025-03-13 17:27:01 | MASTER-Tunka | (18h 26m 43.18s , +51d 36m 20.2s) | C | 10 | 16.8 | 10362 | 2025-03-13 17:27:01 | MASTER-Tunka | (18h 26m 43.20s , +51d 36m 19.9s) | C | 30 | 17.3 | Coadd 10374 | 2025-03-13 17:27:23 | MASTER-Tunka | (18h 26m 39.80s , +51d 37m 43.0s) | C | 10 | 16.8 | 10720 | 2025-03-13 17:33:08 | MASTER-Tunka | (18h 26m 36.56s , +51d 37m 55.9s) | C | 10 | 16.6 | 10744 | 2025-03-13 17:33:32 | MASTER-Tunka | (18h 26m 42.69s , +51d 36m 56.6s) | C | 10 | 16.8 | 10754 | 2025-03-13 17:33:32 | MASTER-Tunka | (18h 26m 42.69s , +51d 36m 56.5s) | C | 30 | 17.5 | Coadd 10767 | 2025-03-13 17:33:55 | MASTER-Tunka | (18h 26m 37.68s , +51d 35m 57.3s) | C | 10 | 16.8 | 10789 | 2025-03-13 17:34:18 | MASTER-Tunka | (18h 26m 44.21s , +51d 36m 18.9s) | C | 10 | 16.8 | 10815 | 2025-03-13 17:34:43 | MASTER-Tunka | (18h 26m 40.39s , +51d 37m 30.3s) | C | 10 | 16.9 | 10825 | 2025-03-13 17:34:43 | MASTER-Tunka | (18h 26m 40.44s , +51d 37m 30.2s) | C | 30 | 17.7 | Coadd 10839 | 2025-03-13 17:35:08 | MASTER-Tunka | (18h 26m 40.46s , +51d 36m 13.0s) | C | 10 | 16.8 | 10862 | 2025-03-13 17:35:30 | MASTER-Tunka | (18h 26m 43.41s , +51d 37m 50.3s) | C | 10 | 16.8 | 10885 | 2025-03-13 17:35:53 | MASTER-Tunka | (18h 26m 36.68s , +51d 37m 01.7s) | C | 10 | 16.9 | 10895 | 2025-03-13 17:35:53 | MASTER-Tunka | (18h 26m 36.66s , +51d 37m 02.1s) | C | 30 | 17.6 | Coadd 10907 | 2025-03-13 17:36:15 | MASTER-Tunka | (18h 26m 38.30s , +51d 38m 01.9s) | C | 10 | 16.9 | 10930 | 2025-03-13 17:36:38 | MASTER-Tunka | (18h 26m 43.27s , +51d 37m 02.6s) | C | 10 | 16.8 | 10953 | 2025-03-13 17:37:01 | MASTER-Tunka | (18h 26m 38.01s , +51d 36m 02.4s) | C | 10 | 16.8 | 10963 | 2025-03-13 17:37:01 | MASTER-Tunka | (18h 26m 38.00s , +51d 36m 03.5s) | C | 30 | 17.6 | Coadd 10976 | 2025-03-13 17:37:24 | MASTER-Tunka | (18h 26m 44.18s , +51d 36m 19.5s) | C | 10 | 16.9 | 11004 | 2025-03-13 17:37:52 | MASTER-Tunka | (18h 26m 41.15s , +51d 38m 04.5s) | C | 10 | 16.8 | 11029 | 2025-03-13 17:38:17 | MASTER-Tunka | (18h 26m 41.16s , +51d 36m 26.7s) | C | 10 | 16.8 | 11039 | 2025-03-13 17:38:17 | MASTER-Tunka | (18h 26m 41.14s , +51d 36m 27.1s) | C | 30 | 17.5 | Coadd 11058 | 2025-03-13 17:38:46 | MASTER-Tunka | (18h 26m 43.88s , +51d 37m 41.9s) | C | 10 | 16.7 | 11205 | 2025-03-13 17:41:14 | MASTER-Tunka | (18h 26m 39.08s , +51d 38m 10.5s) | C | 10 | 16.8 | 11228 | 2025-03-13 17:41:37 | MASTER-Tunka | (18h 26m 44.83s , +51d 37m 10.1s) | C | 10 | 16.8 | 11238 | 2025-03-13 17:41:37 | MASTER-Tunka | (18h 26m 44.80s , +51d 37m 10.9s) | C | 30 | 17.3 | Coadd 11252 | 2025-03-13 17:42:01 | MASTER-Tunka | (18h 26m 39.48s , +51d 36m 12.1s) | C | 10 | 16.8 | 11275 | 2025-03-13 17:42:23 | MASTER-Tunka | (18h 26m 45.26s , +51d 36m 28.7s) | C | 10 | 16.5 | 11299 | 2025-03-13 17:42:47 | MASTER-Tunka | (18h 26m 42.16s , +51d 37m 46.4s) | C | 10 | 16.4 | 11334 | 2025-03-13 17:42:47 | MASTER-Tunka | (18h 26m 42.17s , +51d 37m 46.8s) | C | 80 | 17.2 | Coadd 11323 | 2025-03-13 17:43:11 | MASTER-Tunka | (18h 26m 42.26s , +51d 36m 16.2s) | C | 10 | 16.4 | 12037 | 2025-03-13 17:55:05 | MASTER-Tunka | (18h 26m 44.68s , +51d 36m 59.9s) | C | 10 | 16.9 | 12047 | 2025-03-13 17:55:05 | MASTER-Tunka | (18h 26m 44.69s , +51d 36m 59.7s) | C | 30 | 17.5 | Coadd 12059 | 2025-03-13 17:55:28 | MASTER-Tunka | (18h 26m 48.04s , +51d 38m 17.8s) | C | 10 | 16.8 | 12086 | 2025-03-13 17:55:55 | MASTER-Tunka | (18h 26m 41.99s , +51d 37m 39.3s) | C | 10 | 16.8 | 12201 | 2025-03-13 17:57:25 | MASTER-Tunka | (18h 26m 42.92s , +51d 38m 41.9s) | C | 60 | 16.9 | 13085 | 2025-03-13 18:12:08 | MASTER-Tunka | (18h 26m 50.42s , +51d 38m 12.4s) | C | 60 | 17.1 | 13145 | 2025-03-13 18:12:08 | MASTER-Tunka | (18h 26m 50.39s , +51d 38m 13.0s) | C | 180 | 18.0 | Coadd 13866 | 2025-03-13 18:25:09 | MASTER-Tunka | (18h 26m 53.63s , +51d 38m 41.8s) | C | 60 | 17.3 | 13898 | 2025-03-13 18:25:41 | MASTER-Kislovodsk | (18h 10m 41.76s , +52d 27m 30.9s) | C | 60 | 15.9 | 13989 | 2025-03-13 18:27:12 | MASTER-Kislovodsk | (18h 23m 41.90s , +52d 26m 09.7s) | C | 60 | 15.9 | 14150 | 2025-03-13 18:29:53 | MASTER-Kislovodsk | (18h 22m 06.18s , +54d 19m 08.0s) | C | 60 | 15.5 | 14177 | 2025-03-13 18:30:20 | MASTER-Tunka | (18h 26m 51.05s , +51d 38m 00.9s) | C | 60 | 17.2 | 14489 | 2025-03-13 18:35:33 | MASTER-Tunka | (18h 26m 49.28s , +51d 40m 07.6s) | C | 60 | 17.4 | 14623 | 2025-03-13 18:37:46 | MASTER-Kislovodsk | (18h 10m 37.65s , +52d 27m 19.5s) | C | 60 | 15.8 | 14703 | 2025-03-13 18:39:06 | MASTER-Kislovodsk | (18h 23m 44.86s , +52d 27m 56.3s) | C | 60 | 15.7 | 14811 | 2025-03-13 18:40:54 | MASTER-Tunka | (18h 26m 56.06s , +51d 38m 22.4s) | C | 60 | 17.6 | 14863 | 2025-03-13 18:41:46 | MASTER-Kislovodsk | (18h 22m 08.17s , +54d 19m 55.4s) | C | 60 | 15.9 | 15022 | 2025-03-13 18:44:26 | MASTER-Kislovodsk | (18h 13m 52.92s , +50d 32m 34.5s) | C | 60 | 15.7 | 15102 | 2025-03-13 18:45:45 | MASTER-Kislovodsk | (18h 26m 30.58s , +50d 33m 17.4s) | C | 60 | 15.8 | 15262 | 2025-03-13 18:48:25 | MASTER-Kislovodsk | (18h 10m 39.41s , +52d 28m 11.9s) | C | 60 | 16.3 | 15342 | 2025-03-13 18:49:45 | MASTER-Kislovodsk | (18h 23m 53.56s , +52d 26m 49.5s) | C | 60 | 15.8 | 15501 | 2025-03-13 18:52:24 | MASTER-Kislovodsk | (18h 22m 15.90s , +54d 20m 16.1s) | C | 60 | 16.2 | 15660 | 2025-03-13 18:55:04 | MASTER-Kislovodsk | (18h 13m 54.34s , +50d 32m 38.8s) | C | 60 | 15.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/39706. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L… [View Less]

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[vsnet-grb-info 37720] GRB 250309B: PRIME near-infrared upper limits in 2nd epoch
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39705 SUBJECT: GRB 250309B: PRIME near-infrared upper limits in 2nd epoch DATE: 25/03/13 18:41:30 GMT FROM: O. Guiffreda at UMD <oriogui(a)umd.edu> O. Guiffreda (UMD), J. Durbak (UMD), E. Troja (U Rome), A. S. Kutyrev (NASA/GSFC), S. B. Cenko (NASA/GSFC) Following up the initial PRIME detection (GCN 39670), the transient field was observed a second time ~3.5 days after the initial Fermi GBM trigger (GCN 39635). At the position of the optical … [View More]

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[vsnet-grb-info 37719] GRB 250313A???: BALROG localization (Fermi Trigger / GRB 250313607)
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39704 SUBJECT: GRB 250313A???: BALROG localization (Fermi Trigger / GRB 250313607) DATE: 25/03/13 16:04:30 GMT FROM: Jochen Greiner at MPE <jcgrog(a)mpe.mpg.de> T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger at 14:34:33 on 13 March 2025 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; … [View More]

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[vsnet-grb-info 37718] GRB 250313A: Fermi GBM Final Real-time Localization
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39703 SUBJECT: GRB 250313A: Fermi GBM Final Real-time Localization DATE: 25/03/13 14:44:53 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov> The Fermi GBM team reports the detection of a likely LONG GRB At 14:34:33 UT on 13 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250313A (trigger 763569278.689058 / 250313607). The on-ground calculated location, using the Fermi GBM trigger data, is RA =… [View More]

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[vsnet-grb-info 37717] The EP-WXT trigger 01709132551 is not a real source
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39702 SUBJECT: The EP-WXT trigger 01709132551 is not a real source DATE: 25/03/13 13:25:41 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> J. W. Hu (NAO, CAS), Y. Wang (PMO, CAS), P. Y. Han (HUST), W. D. Zhang (NAO, CAS) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709132551 at the time of 2025-03-13T12:04:16, is not a real source. View this GCN Circular online at https://gcn.nasa.gov/circulars/39702. --- To unsubscribe, open … [View More]

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[vsnet-grb-info 37716] EP250304a: SVOM/VT optical observation
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39701 SUBJECT: EP250304a: SVOM/VT optical observation DATE: 25/03/13 08:06:28 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> R. C. Chen (NJU), L. Lan (NAOC), C. W. Wang, W. J. Tan (IHEP), L. P. Xin, Y. L. Qiu, H. L. Li, Z. H. Yao, Y. Xu, P. P. Zhang, W. J. Xie, J. Wang, X. H. Han, Y. J. Xiao, H. B. Cai, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu) report on behalf of the SVOM mission team. SVOM/VT conducted ToO follow-up observations of the X-ray … [View More]

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[vsnet-grb-info 37715] EP250311a/GRB 250311A: EP-FXT follow-up observation
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39700 SUBJECT: EP250311a/GRB 250311A: EP-FXT follow-up observation DATE: 25/03/13 07:52:04 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> X. Mao (NAO, CAS), Y. J. Zhang (THU), Y. L. Hua (PMO, CAS), Z. X. Ling (NAO, CAS) report on behalf of the Einstein Probe team: Following the detection of the fast X-ray transient EP250311a (Mao et al., GCN 39664), also detected as GRB 250311A by MAXI (Tatano et al., GCN 39660), we performed an observation with … [View More]

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[vsnet-grb-info 37714] ATCA detection of the radio counterpart of GRB 250309B-AT2025dws
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39699 SUBJECT: ATCA detection of the radio counterpart of GRB 250309B-AT2025dws DATE: 25/03/13 07:30:45 GMT FROM: Tao An at SHAO, CAS <antao(a)shao.ac.cn> Tao An, Yuanqi Liu (SHAO, China), Jinjun Geng, Xuefeng Wu (PMO, China), Ailing Wang (IHEP, China) report on behalf of a large collaboration. We report the detection of a radio counterpart to GRB 250309B-AT2025dws (GCN 39629, 39637, 39639) with the Australia Telescope Compact Array (ATCA). We … [View More]

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[vsnet-grb-info 37713] EP250302a: Chandra X-ray Detection
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39698 SUBJECT: EP250302a: Chandra X-ray Detection DATE: 25/03/13 02:48:18 GMT FROM: Brendan O'Connor at Carnegie Mellon University <boconno2(a)andrew.cmu.edu> B. O'Connor (CMU), D. Pasham (MIT), J. Hare (Catholic/GSFC), report on behalf of a larger collaboration: We observed EP250302a (Dai et al., GCN 39556) with the Chandra X-ray Observatory through Director's Discretionary Time (PI: O'Connor) for ~20 ks starting on 2025-03-11 at 14:04:47 UT, … [View More]

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[vsnet-grb-info 37712] GRB 250312A: Swift-XRT refined Analysis
by GCN Circulars 13 Mar '25

13 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39697 SUBJECT: GRB 250312A: Swift-XRT refined Analysis DATE: 25/03/13 01:21:03 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> D.N. Burrows (PSU), M. A. Williams (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), S. Dichiara (PSU) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 8.3 ks of XRT data for GRB 250312A, from 385 s to 34.7 … [View More]

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[vsnet-grb-info 37711] Fermi Gamma-ray Burst Monitor trigger 763509110/250312911 is not a GRB
by GCN Circulars 12 Mar '25

12 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39696 SUBJECT: Fermi Gamma-ray Burst Monitor trigger 763509110/250312911 is not a GRB DATE: 25/03/12 22:57:50 GMT FROM: Lorenzo Scotton at UAH <lscottongcn(a)outlook.com> L. Scotton (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "The Fermi Gamma-ray Burst Monitor (GBM) trigger 763509110/250312911 at 21:51:45.47 UT on 12 March 2025, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to SAA … [View More]

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