GCN Circular 42741
Subject
GRB 251116B: SVOM/ECLAIRs refined analysis
Event
Date
2025-11-18T18:39:14Z (3 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
M. Brunet, O. Godet (IRAP), M. Pillas (IAP), M.G. Bernardini (INAF-OAB, LUPM),
Using the event-by-event data downloaded through the X-band ground station, we report further analysis of ECLAIRs observations of GRB 251116B (SVOM burst-id sb25111604, GCN 42702) detected at T0 = 2025-11-16T15:32:36.
The burst that triggered ECLAIRs consists of a single peak lightcurve, lasting about 10 s in the 4-120 keV energy band.
The time-averaged spectrum from T0-10 s to T0+0.25s in the 5-120 keV energy range is best fitted by a power-law model with a photon index of 1.49 +/-0.28. With this model, the total 4-120 keV fluence is (3.2 +0.2/-1.7)e-07 erg/cm^2.
All the quoted errors are at the 68% confidence level.
The Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC.
The SVOM/ECLAIRs point of contact for this burst is: Marius Brunet (IRAP) (marius.brunet at irap.omp.eu)