GCN Circular 41101
Subject
GRB 250714A: SVOM/GRM observation
Event
Date
2025-07-16T15:02:55Z (a day ago)
From
tanwj@ihep.ac.cn
Via
Web form
SVOM/GRM team: Wen-Jun Tan, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Jean-Luc Atteia, Olivier Godet (IRAP)
Report on behalf of the SVOM team:
SVOM/GRM was triggered in-flight by a bright burst GRB 250714A (SVOM trigger reference: sb25071402) at 2025-07-14T07:15:27.00 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN#41088).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a main peak following behind a relatively weak emission, with a T90 of 21.6+/-10.2 s in the 15-500 keV band.
The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb250714A.png
In addition, the position of this burst, as determined by Fermi/GBM (RA= 94.7, DEC= -21.2, GCN#41088), is located at about 101 degree from the SVOM optical axis, which is well outside the ECLAIRs field of view. But the burst emission has been detected by ECLAIRs through reflection onto the Earth atmosphere, and some of the low-energy emission of GRM is also detected through atmosphere reflection.
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: Wen-Jun Tan (IHEP) (tanwj@ihep.ac.cn)