TITLE:   GCN CIRCULAR
NUMBER:  46234
SUBJECT: GRB 261110A: SVOM/ECLAIRs refined analysis
DATE:    26/11/12 08:18:22 GMT
FROM:    SVOM_group <svomgroup@bao.ac.cn>

N. Dagoneau (CEA), F. Piron (LUPM), Chen-Wei Wang (THU) and Wen-Jun Tan (PKU) report on behalf of the SVOM/ECLAIRs team

Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of GRB 261110A (SVOM burst-id sb26111002, GCN 46215, trigger time T0 = 2026-11-10T11:50:00 UTC). 

The burst that triggered ECLAIRs onboard shows a single broad peak lightcurve. The burst duration is T90 = 32 -5/+8 s in the 4-120 keV energy band.

The time-averaged spectrum from T0-31.84 s to T0-0.32 s in the 5-120 keV energy range is best fitted by a power-law model with a power-law index alpha = -2.01 ± 0.20. With this model, the 4-120 keV fluence is (2.36 ± 0.48)e-7 erg/cm² and the 4-120 keV photon flux is (3.01 ± 0.61)e-1 ph/cm²/s. 

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: Nicolas Dagoneau (CEA) (nicolas.dagoneau at cea.fr)