GCN Circular 38870

SVOM/GRM team: Wang-Chen Xue, Chen-Wei Wang, Shi-Jie Zheng, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)

report on behalf of the SVOM team:

During the commissioning phase, SVOM/GRM was triggered in-flight by a long burst GRB 250107C (SVOM trigger reference: sb25010702) at 2025-01-07T18:52:16.300 UTC (T0), which was also detected by GECAM-B.

With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a duration of about 4 s.

The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb250107C.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: Wang-Chen Xue (IHEP)(xuewc@ihep.ac.cn)