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

[vsnet-grb-info 39190] GRB 250713A : SVOM/ECLAIRs refined analysis
by GCN Circulars 22 Jul '25

22 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41134 SUBJECT: GRB 250713A : SVOM/ECLAIRs refined analysis DATE: 25/07/22 11:09:53 GMT FROM: SVOM_group <svomgroup(a)bao.ac.cn> M. Brunet, L. Bouchet (IRAP), F. Cangemi (APC), P. Maggi (ObAS) Using the event-by-event data downloaded through the X-band ground station, we report further analysis of ECLAIRs observations of the long GRB 250713A (SVOM burst-id sb25071320), The burst that triggered ECLAIRs [onboard/ onground] (GCN #41078) consists of a single peak with a duration of at least 60s visible in the 4-60 keV energy band. The time-averaged spectrum from T0-10s s to T0+32s (T0 = 2025-07-13T17:06:26) in the energy range 4-60 keV is best fitted by a black body model with kT = 4.91 +0.32/-0.30 keV . With this model, the total 4-120 keV fluence is 1.10 +0.07/-0.10 e-8 erg/cm^2. A Broken Power-law also gives a decent fit with a photon index of 1.08 +0.16/-0.18 before the break, a break energy of 21.50 +3.41/-2.76 keV and a photon index of 3.23 +0.81/-0.53 after the break. In that case, the total 4-120 keV fluence is 1.25 +0.06/-0.18 e-8 erg/cm^2. A preliminary time-resolved spectral analysis shows a decrease in the black body temperature from kT = 6.73 +0.72/-0.64 keV to kT =2.72 +0.45/-0.36 keV over the first 42 seconds of the burst duration. At the same time the source radius increases by a factor 4.3 +1.3/-1.7. All the quoted errors are at the 68% confidence level. We note that the calibration of SVOM/ECLAIRs is undergoing thus these results are preliminary. 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. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. The SVOM/ECLAIRs point of contact for this burst is: Marius Brunet (mbrunet at irap.omp.eu) View this GCN Circular online at https://gcn.nasa.gov/circulars/41134. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39189] GRB 250717B: SVOM/GRM observation
by GCN Circulars 22 Jul '25

22 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41133 SUBJECT: GRB 250717B: SVOM/GRM observation DATE: 25/07/22 09:59:21 GMT FROM: yzh807926(a)163.com SVOM/GRM team: Zheng-hang Yu, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP) SVOM/ECLAIRs team: Sebastien Guillot(IRAP) Report on behalf of the SVOM team: SVOM/GRM was triggered by a burst GRB 250717B at 2025-07-17T13:44:23.100 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN#41111) and Swift/BAT-GUANO (Samuele Ronchini et al. 2025, GCN#41110) With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a single pulse with a T90 of 4.5 +1.5/-2.0 s in the 15-5000 keV band. The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250717B.png In addition, the position of this burst, as determined by Fermi/GBM (RA,Dec = 44.1179, 26.3789, GCN#41110), is located at about 75 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view. With this localization, the time-averaged spectrum from T0-0.5 to T0+4.5 s is best fitted by a power law function with an exponential high-energy cutoff. The power law index is -1.82 +0.11/-0.21 and the cutoff energy, parameterized as Epeak, is 47 +23/-20 keV. The event fluence (10-1000 keV) in this time interval is (3.54 +0.40/-0.36)E-06 erg/cm^2. The localization of GRB 250717B in the 'Amati' relation diagram is shown at: https://www.bursthub.cn//admin/static/grb250717B_amati.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 point of contact for this burst is: Zheng-hang Yu (IHEP)(zhyu(a)ihep.ac.cn) View this GCN Circular online at https://gcn.nasa.gov/circulars/41133. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39188] LIGO/Virgo/KAGRA S250711q: Updated Sky localization
by GCN Circulars 21 Jul '25

21 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41132 SUBJECT: LIGO/Virgo/KAGRA S250711q: Updated Sky localization DATE: 25/07/21 21:59:28 GMT FROM: rudall(a)caltech.edu The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA Collaboration report: We have conducted further offline 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 S250711q (GCN Circular 41062). Parameter estimation has been performed using Bilby [1] and a new sky map, Bilby.offline1.multiorder.fits,0, distributed via GCN and SCiMMA notices, is available for retrieval from the GraceDB event page: https://gracedb.ligo.org/superevents/S250711q For the Bilby.offline1.multiorder.fits,0 sky map, the 90% credible region is 2016 deg2. Marginalized over the whole sky, the a posteriori luminosity distance estimate is 4756 +/- 2023 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] Ashton et al. ApJS 241, 27 (2019) doi:10.3847/1538-4365/ab06fc and Morisaki et al. PRD 108, 123040 (2023) doi:10.1103/PhysRevD.108.123040 View this GCN Circular online at https://gcn.nasa.gov/circulars/41132. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39187] The SVOM alert sb25072103 is not due to a GRB, but to a new galactic transient SVOM J195836+32283.
by GCN Circulars 21 Jul '25

21 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41131 SUBJECT: The SVOM alert sb25072103 is not due to a GRB, but to a new galactic transient SVOM J195836+32283. DATE: 25/07/21 17:00:16 GMT FROM: Diego Gotz at CEA <diego.gotz(a)cea.fr> D. Götz, N. Dagoneau, A. Saccardi (CEA), D. Zhao, Y. Ma, L. Xin (NAOC), J.-L. Atteia (IRAP) on behalf of the SVOM collaboration report: The SVOM alert sb25072103 (08:43:10 UTC) is not due to a GRB, but most probably to a new galactic transient source. The ECLAIRs alert was initially identified as a trigger from the known galactic High Mass X-ray Binary, 4U 1954+31. SVOM slewed to the source location, and, due to Earth occultation, MXT and VT could not observe the field right away. As soon as MXT started the observation, about one hour later, at 09:32:37 UTC, its on board software detected an uncatalogued source in its field of view, not consistent with the position of 4U 1954+31. The MXT observation continued until 11:47:43 UTC. Subsequent analysis of the entire MXT X-band data showed that the source was not fading and, on the contrary, increased its flux by a factor about two over the entire duration of the observation. In addition the source presents a thermal spectrum, compatible with a black body of temperature ~0.2 keV. Based on these properties and on its position in the galactic plane (l=69.03, b= 1.6) we can exclude that this alert is due to a GRB, and we propose to classify this source as a new galactic transient, SVOM J195836+32283. The J2000 X-ray coordinates are: R.A. = 19h 58m 36s Dec. = +32° 28’ 20” with a 90% c.l. error radius of 30 arc sec (18 arc sec of statistical error). The MXT error region was in the VT field of view during the SVOM second orbit. A faint uncatalogued optical source was detected within the MXT error region in VT_R band with a brightness of 22.2+/-0.4 mag, compared to the PanSTARRS images at the following J2000 coordinates R.A. = 19h 58m 36.29s Dec. = +32° 28’ 25.7” with an error of 0.5 arc sec. The VT images were obtained between 11:11:09 and 11:42:49 UTC with an effective exposure time of 20x100 seconds. The VT magnitude is not corrected for the Galactic extinction on the line of sight. This source lies at 6 arc seconds from the MXT position, and we suggest that it might be the counterpart of the X-ray source. Follow-up observations at other wavelengths are encouraged. 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. SVOM/ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. SVOM/GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. SVOM/MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE. SVOM/VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS. View this GCN Circular online at https://gcn.nasa.gov/circulars/41131. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39186] GRB 250721A: Tiled Swift observations
by GCN Circulars 21 Jul '25

21 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41130 SUBJECT: GRB 250721A: Tiled Swift observations DATE: 25/07/21 14:05:00 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 series of observations, tiled on the sky, of the MAXI GRB 250721A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/xrt_products/TILED_GRB00137 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. The probability of finding serendipitous sources, unrelated to the MAXI event is high: any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/41130. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39185] GRB 250721A: MAXI/GSC detection
by GCN Circulars 21 Jul '25

21 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41129 SUBJECT: GRB 250721A: MAXI/GSC detection DATE: 25/07/21 13:31:42 GMT FROM: Motoko Serino at Aoyama Gakuin U. <serino(a)phys.aoyama.ac.jp> C. Kang (Ehime U.), M. Serino, Y. Kawakubo (AGU), H. Negoro (Nihon U.), M. Nakajima, K. Takagi, H. Takahashi, K. Tatano, H. Nishio (Nihon U.), T. Mihara, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Hiramatsu, Y. Kondo, A. Yoshida (AGU), Y. Tsuboi, H. Sugai, N. Nagashima (Chuo U.), M. Shidatsu, Y. Niida, T. Nakamoto (Ehime U.), I. Takahashi, Y. Yatsu (Science Tokyo), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, M. Kurihara (JAXA), Y. Ueda, K. Fujiwara (Kyoto U.), M. Yamauchi, M. Nishio, C. Hiraizumi (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (Kanazawa U.), W. Iwakiri (Chiba U.), T. Kawamuro (Osaka U.), S. Yamada (Tohoku U) The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 09:38:05 UT on July 21, 2025. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = ( 82.805, -25.592) = (05 31 13, -25 35 31) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.37 deg and 0.32 deg, respectively. The roll angle of long axis from the north direction is 24.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scan was 119 +- 23 mCrab (4.0-10.0keV, 1 sigma error). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners: (81.815, -25.748) deg = (05 27 15, -25 44 52) (J2000) (82.171, -26.333) deg = (05 28 41, -26 19 58) (J2000) (84.986, -24.908) deg = (05 39 56, -24 54 28) (J2000) (84.621, -24.329) deg = (05 38 29, -24 19 44) (J2000) There was no significant excess flux in the next transit at 11:10 UT with an upper limit of 20 mCrab. We also note that a transient was detected by Fermi (GCN Circular #41128), which is probably associated with the event. View this GCN Circular online at https://gcn.nasa.gov/circulars/41129. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39184] GRB 250721A: Fermi GBM Final Localization
by GCN Circulars 21 Jul '25

21 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41128 SUBJECT: GRB 250721A: Fermi GBM Final Localization DATE: 25/07/21 11:11:33 GMT FROM: A. Holzmann Airasca at University of Trento and INFN Bari <a.holzmannairasca(a)unitn.it> The Fermi GBM team reports the detection of a likely LONG GRB "At 09:37:46.53 UT on 21 July 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250721A (trigger 774783471/250721401). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 76.94, Dec = -12.37 (J2000 degrees, equivalent to J2000 5h 7m, -12d 22'), with a statistical uncertainty of 10.20 degrees. The angle from the Fermi LAT boresight is 82 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250721401/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250721401/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250721401/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/41128. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39183] GRB 250720B: Fermi GBM Final Localization Correction
by GCN Circulars 20 Jul '25

20 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41127 SUBJECT: GRB 250720B: Fermi GBM Final Localization Correction DATE: 25/07/20 22:45:55 GMT FROM: sumanbala2210(a)gmail.com The Fermi GBM team reports the detection of a likely SHORT GRB "At 18:57:10.30 UT on 20 July 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250720B (trigger 774730635/250720790). This trigger was initially classified as Distant Particles by the flight software, but is in fact a GRB. The on-ground calculated location, using the Fermi GBM trigger data, is RA = 92.04, Dec = -80.65 (J2000 degrees, equivalent to J2000 6h 8m, -80d 39'), with a statistical uncertainty of 5.52 degrees. The angle from the Fermi LAT boresight is 152 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720790/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720790/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720790/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/41127. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39182] GRB 250720A: Fermi GBM Final Localization
by GCN Circulars 20 Jul '25

20 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41126 SUBJECT: GRB 250720A: Fermi GBM Final Localization DATE: 25/07/20 22:44:51 GMT FROM: sumanbala2210(a)gmail.com The Fermi GBM team reports the detection of a likely LONG GRB "At 08:13:44.04 UT on 20 July 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250720A (trigger 774692029/250720343). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 69.25, Dec = 23.87 (J2000 degrees, equivalent to J2000 4h 36m, +23d 52'), with a statistical uncertainty of 9.02 degrees. The angle from the Fermi LAT boresight is 94 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720343/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720343/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250720343/…" View this GCN Circular online at https://gcn.nasa.gov/circulars/41126. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 39181] Fermi trigger No 774730635: Global MASTER-Net observations report
by GCN Circulars 20 Jul '25

20 Jul '25

TITLE: GCN CIRCULAR NUMBER: 41125 SUBJECT: Fermi trigger No 774730635: Global MASTER-Net observations report DATE: 25/07/20 22:16:48 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, A.Kuznetsov, K.Zhirkov, I.Panchenko, N.Tiurina, P.Balanutsa, V.Topolev, D.Vlasenko, G.Antipov, A.Sankovich, Yu.Tselik, 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.Sosnovskij (CrAO), 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 GRB250720.79 (trigger No 774730635,06h 08m 09.60s , -80d 39m 00.0s, R=5.52) errorbox 8747 sec after notice time and 8781 sec after trigger time at 2025-07-20 21:23:31 UT, with upper limit up to 19.7 mag. The observations began at zenith distance = 67 deg. The sun altitude is -68.5 deg. The galactic latitude b = -29 deg., longitude l = 293 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2942376 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 8811 | 2025-07-20 21:23:31 | MASTER-SAAO | (06h 02m 59.30s , -80d 27m 46.8s) | C | 60 | 18.8 | 8871 | 2025-07-20 21:23:31 | MASTER-SAAO | (06h 02m 59.34s , -80d 27m 46.6s) | C | 180 | 19.6 | Coadd 8811 | 2025-07-20 21:23:31 | MASTER-SAAO | (06h 13m 30.89s , -80d 42m 49.8s) | C | 60 | 18.8 | 8871 | 2025-07-20 21:23:31 | MASTER-SAAO | (06h 13m 30.90s , -80d 42m 49.8s) | C | 180 | 19.7 | Coadd 8891 | 2025-07-20 21:24:50 | MASTER-SAAO | (06h 02m 59.31s , -80d 27m 43.2s) | C | 60 | 19.0 | 8891 | 2025-07-20 21:24:50 | MASTER-SAAO | (06h 13m 30.67s , -80d 42m 46.5s) | C | 60 | 19.0 | 8970 | 2025-07-20 21:26:09 | MASTER-SAAO | (06h 02m 59.58s , -80d 27m 41.8s) | C | 60 | 19.0 | 8970 | 2025-07-20 21:26:09 | MASTER-SAAO | (06h 13m 30.80s , -80d 42m 44.5s) | C | 60 | 19.0 | 9048 | 2025-07-20 21:27:28 | MASTER-SAAO | (06h 02m 59.74s , -80d 27m 41.8s) | C | 60 | 18.9 | 9048 | 2025-07-20 21:27:28 | MASTER-SAAO | (06h 13m 30.95s , -80d 42m 43.7s) | C | 60 | 19.0 | 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/41125. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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