GCN Circular 45949
Subject
GRB 261008A: SVOM/GRM observation
Event
Date
2026-10-14T12:36:50Z (a day ago)
From
xueyuan zao <zaoxueyuan@gmail.com>
Via
Web form
SVOM/GRM team: Xue-Yuan Zao, Chen-Wei Wang, Shi-Jie Zheng, Yue Huang, Shao-Lin Xiong, Shuang-Nan Zhang (IHEP)
SVOM/ECLAIRs team: Oliver Godet (IRAP)
Report on behalf of the SVOM team:
SVOM/GRM was triggered on-ground by GRB 261008A at 2026-10-08T18:19:08.250 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN #45866) and GECAM-B (Zhang et al., GCN #45878).
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 1.8 +0.7/-0.6 s in the 15-5000 keV band.
The SVOM/GRM light curve can be found here:
https://www.bursthub.cn/gcn/2026/svgrb261008A.png
In addition, the position of this burst, as determined by Fermi/GBM (RA= 310.4, DEC=11.1, ERR=12.4 degrees), is located at about 49.9 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view.
With this localization, the time-averaged spectrum from T0-1.15 to T0+0.95 s is best fitted by a power law function. The power law index is -1.59 +0.13/-0.14. The event fluence (10-1000 keV) in this time interval is (4.60 +1.07/-1.02)E-07 erg/cm^2.
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: Xue-Yuan Zao (IHEP)(zaoxy@ihep.ac.cn)