GCN Circular 45562

C. Wang (IHEP), W. Xie (NAOC), N. Dagoneau (CEA), D. Götz (CEA), C. Plasse (HKU),  K. Liu (GXU), Y. Ma (NAOC), report on behalf of the SVOM mission team:

At 2026-09-14T11:12:31 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260914A (SVOM burst-id sb26091401). 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 9 alerts. CRT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 12.81 in the [5-20] keV energy band over a time window of 10.20 seconds starting at 2026-09-14T11:12:27.

The localization of the best alert is R.A., Dec. 31.5419, 29.2616 degrees:
R.A. (J2000) = 2h06m10.06s
Dec. (J2000) = 29d15m41.72s
 with a 90% confidence level (C.L.) radius of 6.33 arcmin (including systematic error of 2 arcmin added in quadrature).

This burst also triggered SVOM/GRM at 2026-09-14T11:12:32 on a timescale of 1 seconds with an SNR of 9.30.
The SVOM/GRM light curve showed a single narrow peak structure with a T90 duration of about 4.327 (-0.558 +2.287). The lightcurve of GRM could be found in the link below: https://www.bursthub.cn/gcn/2026/svgrb260914A.png

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 Yinuo Ma: mayn@bao.ac.cn .
Please contact the BA by email if you require additional information.