{
  "subject": "GRB 250311B: SVOM detection of a burst",
  "circularId": 39662,
  "eventId": "GRB 250311B",
  "createdOn": 1741681541624,
  "submittedHow": "web",
  "body": "C.W. Wang (IHEP), R.C. Chen (NJU), H. Goto, D. Turpin (CEA), M. G. Bernardini (INAF-OAB, LUPM) \non behalf of the SVOM mission team.\n\nAt 2025-03-11T07:08:05.065 UTC (Tb) SVOM/ECLAIRs triggered on the gamma-ray burst GRB 250311B (SVOM burst-id sb25031101). \nThe following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.\n\nThe burst was only detected by the Count rate Trigger (CRT), from which we received 1 alert. CRT provided the alert with the best signal-to-noise-ratio (SNR) of 7.45 in the [8-120] keV energy band over a time window of 10.2 seconds starting at Tb.\n\nThe localization of the best alert is R.A., Dec 146.885, 29.891 degrees:\nRA (J2000) = 9h47m32.36s\nDec (J2000) = 29d53m26.62s\nwith a 90% C.L. radius of 10.53 arcmin (including systematic error of 2 arcmin added in quadrature).\n\nNo immediate slew was performed on this burst. A SVOM ToO has been requested.\n\nThe 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.\n\nThe Burst Advocate (BA) on shift for this burst is C.W. Wang: cwwang@ihep.ac.cn.\nPlease contact the BA by email if you require additional information regarding the SVOM follow-up of this burst.\n",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "bibcode": "2025GCN.39662....1W",
  "format": "text/plain"
}