TITLE:   GCN CIRCULAR
NUMBER:  41566
SUBJECT: GRB 250826A: SVOM/GRM observation
DATE:    25/08/27 16:10:33 GMT
FROM:    Chenwei Wang at IHEP <cwwang@ihep.ac.cn>

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

SVOM/ECLAIRs team: Sebastien Guillot (IRAP), Frédéric Piron (CEA)

Report on behalf of the SVOM team:

SVOM/GRM was triggered on-ground by GRB 250826A at 2025-08-26T07:24:03.000 UTC (T0), which is also detected by Fermi/GBM (Fermi GBM Team, GCN #41545).

With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of a single pulse with a T90 of 8.0 +4.0/-1.5 s in the 15-5000 keV band.

The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb250826A.png

In addition, the position of this burst, as determined by Fermi/GBM (RA = 141.8, Dec = 34.7, GCN #41545), is located at about 136 degrees from the SVOM optical axis, which is outside the ECLAIRs field of view.

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)