TITLE: GCN CIRCULAR NUMBER: 43705 SUBJECT: GRB 260211A: SVOM detection of a burst DATE: 26/02/11 19:49:48 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> D. Gotz, D. ADRIEN, D. Turpin , S. Schanne (CEA), T. Maiolino (LUPM), report on behalf of the SVOM mission team: At 2026-02-11T19:24:33 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260211A (SVOM burst-id sb26021102). 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 22 alerts. CRT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 14.48 in the [5-20] keV energy band over a time window of 20.40 seconds starting at 2026-02-11T19:24:28. The localization of the best alert is R.A., Dec. 86.9994, -0.4306 degrees: R.A. (J2000) = 5h47m59.85s Dec. (J2000) = -0d25m50.14s with a 90% confidence level (C.L.) radius of 5.68 arcmin (including systematic error of 2 arcmin added in quadrature). The SVOM/ECLAIRs light curve showed a single/multiple broad/narrow peak structure with a T90 duration of about 15.15 (-1.54/+1.27) (5-120 keV). This burst was also detected by SVOM/GRM with a significance of 12.50. The SVOM/GRM light curve showed a single/multiple broad/narrow peak structure with a T90 duration of about 27.45(-8.13/+6.72) (4-550 keV). Due to satellite constraints, 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 Diego Gotz: diego.gotz@cea.fr. Please contact the BA by email if you require additional information. View this GCN Circular online at https://gcn.nasa.gov/circulars/43705. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...