GCN Circular 43295

Wenjin XIE (NAOC), Wenjun TAN (IHEP), Donhua ZHAO (NAOC), Chenwei WANG (IHEP) report on behalf of the SVOM mission team:


At 2026-01-02T04:10:03 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260102A (SVOM burst-id sb26010201).

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

The burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 14 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 16.44 in the [8-120] keV energy band over a time window of 40.96 seconds starting at 2026-01-02T04:09:45.

The localization of the best alert is R.A., Dec. 183.8803, 48.2583 degrees:
R.A. (J2000) = 12h15m31.28s
Dec. (J2000) = 48d15m29.77s
 with a 90% confidence level (C.L.) radius of 5.09 arcmin (including systematic error of 2 arcmin added in quadrature).

SVOM/GRM detected the burst also. The SVOM/GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb260102A.png


SVOM slewed to the burst. SVOM/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 Wenjin XIE: xiewj@bao.ac.cn.
Please contact the BA by email if you require additional information.