GCN Circular 43314

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

SVOM/ECLAIRs team: Frédéric Piron (LUPM)

Report on behalf of the SVOM team:

SVOM/GRM was triggered in-flight by a burst GRB 260103A (SVOM trigger reference: sb26010302) at 2026-01-03T01:46:54.000 UTC (T0). 

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 T90 of 8.0 +3.8/-1.8 s in the 15-5000 keV band. 

The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb260103A.png

We note that the burst occurred near the end of a C class solar flare as detected by the GOES satellites. So the solar flare origin cannot be excluded although this burst has a typical brightness, duration, and hardness of a long GRB.

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 point of contact for this burst is: Chen-Wei Wang(IHEP)(cwwang@ihep.ac.cn)