GCN Circular 46215

Chen-Wei Wang (THU), Li Zhang (IHEP), Wen-Jun Tan (PKU), S. Schanne, A. Saccardi, B. Cordier, D. Turpin (CEA/Irfu) report on behalf of the SVOM mission team:

At 2026-11-10T11:50:00 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 261110A (SVOM burst-id sb26111002).

The following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.

The burst was only detected by the Image Trigger (IMT), which produced a sequence of 3 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 7.60 in the [5-20] keV energy band over a time window of 40.96 seconds starting at 2026-11-10T11:49:19.

The localization of the best alert is R.A., Dec. 350.7538, 33.0385 degrees:
R.A. (J2000) = 23h23m00.91s
Dec. (J2000) = 33d02m18.62s
 with a 90% confidence level (C.L.) radius of 10.33 arcmin (including systematic error of 2 arcmin added in quadrature).

The SVOM/ECLAIRs light curve showed a weak peak structure with a T90 duration of about 21.891 (-8.717 +8.734).

SVOM slewed to the burst.

MXT and VT began observing the field after the slew. The analysis of the data will be published in a future circular.

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. SVOM/ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. SVOM/GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. SVOM/MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE.

The Burst Advocate (BA) on shift for this alert is Wenjun Tan: tanwj@pku.edu.cn.
Please contact the BA by email if you require additional information.