{
  "submittedHow": "web",
  "circularId": 46150,
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "format": "text/plain",
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of SVOM_group <svomgroup@bao.ac.cn>",
  "eventId": "GRB 261104A",
  "subject": "GRB 261104A: SVOM detection of burst",
  "editedOn": 1793832401007,
  "body": "M. G. Bernardini (INAF/LUPM), M. Gnaoui (IAP), and R. Hamburg (USRA) report on behalf of the SVOM/ECLAIRs team\n\nAt 2026-11-04T20:36:44 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 261104A (SVOM burst-id sb26110402).\n\nThe following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.\n\nThe burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 5 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 8.02 in the [5-20] keV energy band over a time window of 20.48 seconds starting at 2026-11-04T20:36:31.\n\nThe localization of the best alert is R.A., Dec. 6.2999, -54.4612 degrees:\nR.A. (J2000) = 0h25m11.98s\nDec. (J2000) = -54d27m40.50s\n with a 90% confidence level (C.L.) radius of 9.81 arcmin (including systematic error of 2 arcmin added in quadrature).\n\nThe SVOM/ECLAIRs light curve showed a single broad peak structure with a T90 duration of about 40 s.\n\nSVOM slewed to the burst.\n\nMXT and VT began observing the field after the slew. The analysis of the data will be published in a future circular.\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. 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.\n\nThe Burst Advocate (BA) on shift for this alert is Mouad GNAOUI: mouad.gnaoui@iap.fr.\nPlease contact the BA by email if you require additional information.",
  "createdOn": 1793826239671,
  "version": 2
}