TITLE: GCN CIRCULAR NUMBER: 39282 SUBJECT: GRB 250210A: SVOM/GRM observation of a long burst DATE: 25/02/11 13:03:35 GMT FROM: yqzhang_cl@163.com
SVOM/GRM team: Yan-Qiu Zhang, Wen-Long Zhang, Shi-Jie Zheng, Wen-Jun Tan, Chen-Wei Wang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Frédéric Piron (LUPM), Nicolas Dagoneau (CEA), Maria-Grazia Bernardini (INAF-OAB), Jean-Luc Atteia (IRAP)
report on behalf of the SVOM team:
SVOM/GRM was triggered in-flight by a long burst GRB 250210A (sb25021009) at 2025-02-10T05:31:56.000 UTC (T0), which was also observed by Fermi/GBM (Fermi GBM team, GCN #39262), AstroSat CZTI (A. Dasgupta et al., GCN #39267) and INTEGRAL/SPI-ACS (P. Barria et al., GCN #39268).
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 32.54 +/- 3.62 s in the 15-300 keV band.
In addition, the position of this burst, as determined by Fermi/GBM (GCN #39262, RA: 150.3 deg, DEC: -25.5 deg, Error: 2.8 deg), is located at about 52 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/svgrb250210A.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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