TITLE:   GCN CIRCULAR
NUMBER:  38994
SUBJECT: GRB 250117A: SVOM/GRM observation of a short burst
DATE:    25/01/20 04:00:03 GMT
FROM:    Chenwei Wang at IHEP <cwwang@ihep.ac.cn>

SVOM/GRM team: Chen-Wei Wang, Yue Huang, 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 short burst GRB 250117A (SVOM trigger reference: sb25011705) at 2025-01-17T20:21:58.300 UTC (T0), which was also detected by GECAM (GCN #38982), Swift/BAT (GCN #38988), Fermi/GBM, Konus-Wind and INTEGRAL/SPI-ACS.

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 0.91 +0.43/-0.28 s.

The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb250117A.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: Chen-Wei Wang (IHEP) (cwwang@ihep.ac.cn)