TITLE: GCN CIRCULAR NUMBER: 38923 SUBJECT: GRB 250113A: SVOM/GRM observation of a long burst DATE: 25/01/13 14:04:20 GMT FROM: Chenwei Wang at IHEP cwwang@ihep.ac.cn
SVOM/GRM team: 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 250113A (SVOM trigger reference: sb25011303) at 2025-01-13T06:24:36.900 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 multi-pulses with a T90 of 42 +2/-3 s.
The SVOM/GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb250113A.png
The SVOM/GRM on-ground localization of this burst is (J2000): RA: 321.4 deg DEC: -21.6 deg Error: 2.7 deg (1sigma, statistical only) We caution that the calibration of SVOM/GRM is undergoing and this localization is subject to systematic errors.
In addition, the position of this burst, as determined by GRM, is located at about 159 degrees from the SVOM optical axis. However, we note that this GRM location is broadly consistent with the non-detection of ECLAIRs.
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)
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