GCN Circular 46267

An Li (BNU), Hatsune Goto (CEA/RIKEN), Nicolas Dagoneau (CEA), Diego Götz (CEA), Andrea Saccardi (CEA), Bertrand Cordier (CEA),  Ziqi Wang (GXU), Wenjin Xie (NAOC)  report on behalf of the SVOM mission team:

At 2026-11-14T09:33:13 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 261114A (SVOM burst-id sb26111401). The following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.

The burst was detected by the Image Trigger (IMT), from which we received a sequence of 4 alerts. At the time of reception, IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 13.84 in the [8-120] keV energy band over a time window of 40.96 seconds starting at 2026-11-14T09:32:53. Note that at least 25 alerts were generated but only 4 have been received.

The localization of the best alert is R.A., Dec. 345.8973, -32.3702 degrees:
R.A. (J2000) = 23h03m35.35s
Dec. (J2000) = -32d22m12.60s
 with a 90% confidence level (C.L.) radius of 5.91 arcmin (including systematic error of 2 arcmin added in quadrature).

The SVOM/ECLAIRs light curve showed a single broad peak structure with a T90 duration of about 46 -9 / +6 s.

SVOM slewed to the burst. SVOM/MXT began observing the field after the slew. Using onboard processed data, no X-ray source was detected with MXT.
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 Wenjin XIE: xiewj@bao.ac.cn.
Please contact the BA by email if you require additional information.