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@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 (SVOM trigger reference: sb25031307) at 2025-03-13T17:52:11.1 (T0).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of single main pulse with a T90 of 0.45 +0.27/-0.15 s in the 15-2000 keV band.
The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250313B.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: Wen-Long Zhang (IHEP) (zhangwl@ihep.ac.cn)
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