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@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:
SVOM/GRM was triggered in-flight by GRB 250313A (SVOM trigger reference: sb25031306) at 2025-03-13T14:34:33.900 (T0), which is also detected by Fermi/GBM (Fermi GBM team, GCN #39703), AstroSat (A. Dasgupta et al., GCN #39714) and Fermi/LAT (N. Di Lalla et al., GCN #39711).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a main emission followed by a flare with a T90 of 310.8 +3.4/-6.6 s in the 15-5000 keV band.
The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250313A.png
ECLAIRs was not collecting data at the time of this burst.
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: Chen-Wei Wang (IHEP) (cwwang@ihep.ac.cn)
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