GCN Circular 43437

J. T. Palmerio, D. Adrien, S. Schanne, D. Turpin (CEA/Irfu), F. Piron (LUPM), report on behalf of the SVOM mission team:

At 2026-01-17T19:43:25 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260117A (SVOM burst-id sb26011705).

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 Count-Rate Trigger (CRT), which produced a sequence of 1 alert. CRT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 8.05 in the [5-20] keV energy band over a time window of 20.48 seconds starting at 2026-01-17T19:43:05.

The localization of the best alert is R.A., Dec. 188.1895, 43.8927 degrees:
R.A. (J2000) = 12h32m45.49s
Dec. (J2000) = 43d53m33.87s
 with a 90% confidence level (C.L.) radius of 9.77 arcmin (including systematic error of 2 arcmin added in quadrature).

This burst was also detected by SVOM/GRM with a significance of 8.90.
The SVOM/GRM light curve shows a double peak structure with a T90 duration of about 20 (-4 +5) seconds.

Due to the detection significance being below the slew threshold, no immediate slew was performed on this burst.
No X-ray observation could be performed by SVOM/MXT for the time being. No optical observation could be performed by SVOM/VT for the time being.

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 Jesse T. Palmerio: jesse.palmerio@cea.fr.
Please contact the BA by email if you require additional information.