TITLE: GCN CIRCULAR NUMBER: 39470 SUBJECT: GRB 250223C: SVOM/GRM observation of a long burst DATE: 25/02/25 13:44:49 GMT FROM: yqzhang_cl@163.com
SVOM/GRM team: Yan-Qiu Zhang, Chao Zheng, Chen-Wei Wang, Shi-Jie Zheng, Wen-Jun Tan, Chen-Wei Wang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Nicolas Dagoneau (CEA), Maria-Grazia Bernardini (INAF-OAB), Jean-Luc Atteia (IRAP)
report on behalf of the SVOM team:
SVOM/GRM was triggered on-ground by a long burst GRB 250223C at 2025-02-23T16:18:36.500 UTC (T0), which was also observed by Fermi/GBM (Fermi GBM team, GCN #39459).
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 40.50 +/- 15.03 s in the 15-2000 keV band.
ECLAIRs was not collecting data at the time of this burst.
The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250223C.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: Yan-Qiu Zhang (IHEP) (zhangyanqiu@ihep.ac.cn)
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