March 2025 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 37618] GRB 250305A: SVOM/GRM observation of a burst
by GCN Circulars 06 Mar '25

06 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39602 SUBJECT: GRB 250305A: SVOM/GRM observation of a burst DATE: 25/03/06 09:51:52 GMT FROM: zhangjinpeng(a)ihep.ac.cn SVOM/GRM team: Jin-Peng 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 250305A (SVOM burst-id sb25030508) at 2025-03-05T15:28:58.100 (T0), which was also observed by Fermi/GBM (Fermi GBM team, GCN #39597). With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multi-pulses with a T90 of 4.6 +1.5/-0.9 s in the 15-5000 keV band. In addition, the position of this burst, as determined by Fermi/GBM (GCN #39597, RA: 223.7 deg, DEC: -3.0 deg, Error: 5.0 deg), is located at about 63 degrees from the SVOM optical axis, and outside the ECLAIRs field of view. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250305A.png The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. GRM is developed by the Institute of High Energy Physics (IHEP) of CAS. The SVOM/GRM point of contact for this burst is: Jin-Peng Zhang (IHEP) (zhangjinpeng(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/39602. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37617] The EP-WXT trigger 01709132323 is likely a flaring star
by GCN Circulars 06 Mar '25

06 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39601 SUBJECT: The EP-WXT trigger 01709132323 is likely a flaring star DATE: 25/03/06 09:42:08 GMT FROM: EP Team at NAOC/CAS <ep_ta(a)bao.ac.cn> Y.-H. I. Yin (NJU), H. Sun, X. P. Xu, C. C. Jin (NAO, CAS) report on behalf of the Einstein Probe team: The EP-WXT trigger (ID: 01709132323) on 2025-03-06 09:04:17 (UTC) is likely a stellar flare associated with a star TYC 2497-986-1. The estimated flux of the flare is around 1.2 x 10^-10 erg/s/cm^2 in 0.5-4.0 keV, corresponding to an X-ray luminosity of around 2.3 x 10^33 erg/s. Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with onboard X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics). View this GCN Circular online at https://gcn.nasa.gov/circulars/39601. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37616] EP250304A: Upper limits from Fermi-GBM Observations
by GCN Circulars 06 Mar '25

06 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39600 SUBJECT: EP250304A: Upper limits from Fermi-GBM Observations DATE: 25/03/06 09:13:06 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: At the starting time T0=2025-03-04T01:29:49 UTC of the EP-WXT event EP250304A (Zhang et al., GCN 39591), Fermi was in South Atlantic Anomaly (SAA). Fermi-GBM had exited SAA approximately 50 seconds after T0. There was no Fermi-GBM onboard trigger around EP-WXT time. The GBM targeted search [1], the most sensitive, coherent search for GRB-like signals, was run in the time interval [T0-50;T0+500] s, seeking signals between 64 ms and 32.768 s in duration. No signal consistent with the EP transient both temporally and spatially is identified, as confirmed by visual inspection of the data. Assuming a “soft” spectral template (Band function with Epeak = 70 keV, alpha = -1.9, beta = -3.7), and a duration of 8.192 s, we derive a sky-averaged flux upper limit of 3.9e-08 erg/cm2/s in the energy band 10-1000 keV. [1] Goldstein et al. 2019 arXiv:1903.12597 View this GCN Circular online at https://gcn.nasa.gov/circulars/39600. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37615] Fermi GRB 250305A: Global MASTER-Net observations report
by GCN Circulars 05 Mar '25

05 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39599 SUBJECT: Fermi GRB 250305A: Global MASTER-Net observations report DATE: 25/03/05 21:32:49 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, 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 GRB 250305A ( Fermi GBM team, GCN 39597) errorbox 20388 sec after notice time and 20424 sec after trigger time at 2025-03-05 21:09:22 UT, with upper limit up to 18.6 mag. The observations began at zenith distance = 78 deg. The sun altitude is -45.2 deg. The galactic latitude b = 47 deg., longitude l = 353 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2801332 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 20455 | 2025-03-05 21:09:22 | MASTER-SAAO | (14h 34m 50.28s , -02d 29m 23.3s) | C | 60 | 18.3 | 20534 | 2025-03-05 21:10:41 | MASTER-SAAO | (14h 42m 45.22s , -02d 30m 38.4s) | C | 60 | 18.4 | 20613 | 2025-03-05 21:12:01 | MASTER-SAAO | (14h 36m 36.01s , -04d 22m 25.4s) | C | 60 | 18.6 | 20772 | 2025-03-05 21:14:39 | MASTER-SAAO | (14h 44m 39.80s , -04d 22m 36.6s) | C | 60 | 18.5 | 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/39599. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37614] Fermi-LAT Gamma-ray Observations of IceCube-250302A
by GCN Circulars 05 Mar '25

05 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39598 SUBJECT: Fermi-LAT Gamma-ray Observations of IceCube-250302A DATE: 25/03/05 18:12:45 GMT FROM: chiara.bartolini-1(a)unitn.it C. Bartolini (INFN Bari), S. Buson (DESY, Univ. of Wuerzburg), S. Garrappa (Weizmann Institute of Science), L. Pfeiffer (Univ. of Wuerzburg) and P. M. Veres (Ruhr University Bochum) on behalf of the Fermi-LAT collaboration: We report an analysis of observations of the vicinity of the high-energy IC250302A neutrino event (GCN 39549) with all-sky survey data from the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope. The IceCube event was detected on 2025-03-02 03:20:52.90 UTC (T0) with J2000 position RA = 348.05 (+0.38, -0.43) deg, Decl. = 3.77 (+0.42, -0.41) deg 90% PSF containment. No cataloged gamma-ray sources are found within the 90% IC250302A localization error (The Fourth Fermi-LAT catalog, 4FGL-DR4, The Fermi-LAT collaboration 2023, arXiv:2307.12546). We searched for the existence of intermediate (days to years) timescale emission from a new gamma-ray transient source. Preliminary analysis indicates no significant (>5sigma) new excess emission (> 100 MeV) within the IC250302A 90% confidence localization. Assuming a power-law spectrum (photon index = 2.0 fixed) for a point source at the IceCube best-fit position, the >100 MeV flux upper limit (95% confidence) is <9.21e-10 ph cm^-2 s^-1 for ~16-years (2008-08-04 / T0), <9.22e-09(<6.48e-8) ph cm^-2 s^-1 for a 1-month (1-day) integration time before T0. Since Fermi normally operates in an all-sky scanning mode, regular monitoring of this source will continue. For this source, the Fermi-LAT contact person is C. Bartolini (chiara.bartolini at ba.infn.it). The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden. View this GCN Circular online at https://gcn.nasa.gov/circulars/39598. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37613] GRB 250305A: Fermi GBM Final Real-time Localization
by GCN Circulars 05 Mar '25

05 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39597 SUBJECT: GRB 250305A: Fermi GBM Final Real-time Localization DATE: 25/03/05 15:39:31 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 15:28:57 UT on 5 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250305A (trigger 762881342.919284 / 250305645). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 223.7, Dec = -3.0 (J2000 degrees, equivalent to J2000 14h 54m, -3d 00'), with a statistical uncertainty of 5.0 degrees. The angle from the Fermi LAT boresight is 60.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250305645/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250305645/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250305645/… View this GCN Circular online at https://gcn.nasa.gov/circulars/39597. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37612] EP250302a: Optical Observations at CrAO and SAO RAS
by GCN Circulars 05 Mar '25

05 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39596 SUBJECT: EP250302a: Optical Observations at CrAO and SAO RAS DATE: 25/03/05 12:52:41 GMT FROM: Nicolai Pankov at HSE, IKI RAS <colinsergesen(a)gmail.com> N. Pankov (HSE, IKI), A. Moskvitin (SAO RAS), O. I. Spiridonova (SAO RAS), A. Pozanenko (IKI), E. Klunko (ISTP) report on behalf of IKI-GRB-FuN: We performed optical observations of the field of a fast X-Ray transient EP250302a (Dai et al., GCN 39556; Page et al., GCN 39557) in the R filter with the 2.6-meter telescope of the Crimean Astrophysical Observatory (CrAO) and the 1-meter Zeiss-1000 telescope of the Special Astrophysical Observatory of the RAS (SAO RAS). The observations began on 2025-03-03 (UT) 01:51:40, i.e. 1.42750 days since trigger. The optical source (Zhu et al., GCN 39550; Busmann et al., GCN 39551; Leonini et al., GCN 39553; Wu et al., GCN 39555; Xin et al., GCN 39558; Adami et al., GCN 39560; Yang et al., GCN 39561; Becerra et al., GCN 39562; Izzo et al., GCN 39564; Pankov et al., GCN 39565; Reguitti, GCN 39568; Komesh et al., GCN 39569; Shilling and Breeveld, GCN 39570; Aryan et al., GCN 39572; Moskvitin et. al, GCN 39576; Wu et. al, GCN 39578; Pankov et. al, GCN 39586; Gupta et. al, GCN 39593) is not detected in the stacked images from both telescopes. The preliminary upper limits are as follows: Date UT start t-T0 Exptime Filter UL Telescope (mid, days) (s) (3sigma) 2025-03-03 01:51:40 1.44460 9*300 Rc 22.7 Zeiss-1000/SAO RAS 2025-03-04 23:21:23 2.33286 14*120 R 23.3 ZTSh/CrAO The photometry is based on nearby stars from the USNO-B1.0 catalog (R2 magnitudes) and has not been corrected for the Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/39596. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37611] GRB 250219A: SVOM/C-GFT optical upper limit at early phase
by GCN Circulars 05 Mar '25

05 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39595 SUBJECT: GRB 250219A: SVOM/C-GFT optical upper limit at early phase DATE: 25/03/05 12:41:57 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> Zhe Kang (CHO), F. Daigne (IAP), M. Gnaoui (IAP), Liping Xin(NAOC), Xuhui Han(NAOC), Chao WU (NAOC), Pinpin Zhang (NAOC), Xiaomeng Lu (NAOC), Zhenwei Li (CHO), You Lv (CHO), Ruosong Zhang (NAOC), Yujie Xiao(NAOC), Yulei, Qiu(NAOC), Jing Wang(NAOC), Jianyan Wei (NAOC) report on behalf of the SVOM/C-GFT team: We observed the field of GRB 250219A (SVOM/ECLAIRs burst-id:sb25021904, Daigne et al. GCN 39376) starting at 2025-02-19T16:03:29 UT, ~10.68 mins after the burst trigger with C-GFT. A series of g, r and i band images were obtained with exposure time of 10s for each frame. No source consistent with the XRT (Kennea et al., GCN 39379; Turpin et al., GCN 39456) was detected. The optical counterpart (Xin et al., GCN 39380; Magnani et al., GCN 39382; Fu et al., GCN 39383; ) was not detected in our images. The upper limit at early phase are, (T-T0)_mid(sec) exptime(s) limiting_mag(3sigma) band ------------------------------------------------------ 678 6x10s >19.57 (6x10s) i 1013 6x10s >20.11 (6x10s) g 1102 6x10s >20.03 (6x10s) r The photometry was calibrated with nearby stars in UCAC4 catalog. It is consistent with those results reported by Lagioia et al. (GCN 39381), Adami et al. (GCN 39384), Breeveld et al (GCN 39385), Turpin et al. (GCN 39407) and Komesh et al. (GCN 39419). We thank the observation assistant Guangsheng Zhang and Chunlei Guo at Jilin observatory for their excellent support. Chinese Ground Follow-up Telescope of SVOM mission is located at Jilin, Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.28 deg x 1.28 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope. View this GCN Circular online at https://gcn.nasa.gov/circulars/39595. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37610] EP 250304A: Optical counterpart detection by LCO
by GCN Circulars 05 Mar '25

05 Mar '25

TITLE: GCN CIRCULAR NUMBER: 39594 SUBJECT: EP 250304A: Optical counterpart detection by LCO DATE: 25/03/05 09:43:20 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 EP 250304A triggered by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission (Chen et al., GCN 39580) in r filter of the 1-meter Sinistro telescope at the Las Cumbres Observatory Global Telescope (LCOGT) node located at South African Astronomical Observatory (SAAO), South Africa. The 1-m Sinistro telescope is equipped with a 4K x 4K CCD (FOV: 26 x 26 arcmin, scale: 0.39 arcsec/pixel). Observations began on March 04, 2025, starting 19.80 hours after the GRB trigger. We clearly detect the optical transient (OT) reported by GCNs (Xu et al, GCN 39583, Page et al., GCN 39584, Saccardi et al., GCN 39585, Shilling et al., 39587) in our r band image. |Date| |UTstart| |t-T0 (hours)| |Exp (sec)| |Filter| |Magnitude| -------------------------------------------------------------------------------------------------- 2025-03-04 21:20:52.80 19.80 1 x 1000 r r = 20.00 +/- 0.08 The field was calibrated against nearby APASS stars, with magnitudes converted using Lupton (2005) equations, and has not been corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/39594. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 37609] GCN Announcement: End of INTEGRAL Operations
by GCN Announcements 04 Mar '25

04 Mar '25

Beginning March 4, 2025 at 12:08:04 UT, data from the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) will no longer be transmitted to the INTEGRAL Science Data Centre (ISDC), due to the end of scientific operations, more than 22 years after its launch. As a consequence, the INTEGRAL Burst Alert System (IBAS) will be discontinued and GCN Notices will no longer be distributed. The full archive of INTEGRAL GCN Notices is available at https://gcn.gsfc.nasa.gov/integral.html. The IBAS team thank the scientific community for the continuous support. The GCN team thank INTEGRAL for being an important contributor to GCN over the last 22 years. The mission pages for GCN Notice producers that are no longer operational have been moved to a submenu for archived missions, including AGILE, BurstCube, and INTEGRAL (https://gcn.nasa.gov/missions/archive). This news was also reported by the INTEGRAL team in GCN Circular 39563. For more details on this new feature and an archive of GCN news and announcements, see https://gcn.nasa.gov/news. For questions, issues, or bug reports, please contact us via: - Contact form: https://gcn.nasa.gov/contact - GitHub issue tracker: https://github.com/nasa-gcn/gcn.nasa.gov/issues --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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