{
  "createdOn": 1793987770718,
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "subject": "GRB 261103A: SVOM/ECLAIRs refined analysis",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "body": "\nM. Brunet (IRAP), Y.-H.Cheng (YNU), W.-L.Zhang (PMO) report on behalf of the SVOM/ECLAIRs team\n\nUsing the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of the possible burst GRB 261103A (GCN 46137, trigger time T0 = 2026-11-03T06:51:11 UTC). \n\nThe event that triggered ECLAIRs onground shows a single peak lightcurve. The burst duration is T90 = 35 +/- 13 s in the 4-20 keV energy band.\n\nThe time-averaged spectrum from T0-33.8 s to T0+0.8 s in the 5-120 keV energy range is best fitted by a powerlaw model with a photon index alpha = -3 +0.5/-0.8. With this model, the 4-120 keV fluence is (1.4 +/- 0.4)e-7 erg/cm^2 and the 4-120 keV photon flux is 0.32 +/- 0.06 ph/cm^2/s. \n\nThe spectrum can be equally fitted by a blackbody model with a temperature kT = 2.0 +0.7/-0.5 keV. With this model, the 4-120 keV fluence is (9.7 +/- 2.3)e-8 erg/cm^2 and the 4-120 keV photon flux is 0.23 +0.04/-0.05 ph/cm^2/s. \n\nIf this event is a GRB, it can be classified as an X-Ray Flash (XRF).\n\nAll the quoted errors are at the 68% confidence level.\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. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC.\n\nThe SVOM/ECLAIRs point of contact for this burst is: M. Brunet (IRAP) (marius.brunet at utoulouse.fr)\n\n\n\n",
  "format": "text/plain",
  "eventId": "GRB 261103A",
  "circularId": 46176,
  "submittedHow": "web"
}