{
  "format": "text/plain",
  "eventId": "GRB 260917B",
  "submittedHow": "web",
  "createdOn": 1790002687930,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "circularId": 45681,
  "body": "H. Yang, M. Brunet, O. Godet (IRAP), N. Dagoneau (CEA), K. Liu (USTC), C. Wu (NAOC)\nreport 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 GRB 260917B (SVOM burst-id sb26091701 – GCN 45606, trigger time T0 = 2026-09-17T03:52:21 UTC).\n\nThe burst that triggered ECLAIRs onboard shows a broad bump from T0 - 18 s to T0 + 17 s. The burst duration estimated through the imaging technique is T90 =  35 +/- 6 s in the 4-120 keV energy band. \n\nThe time-averaged spectrum from T0 - 18 s to T0 + 17 s in the 5-120 keV energy range is best fitted by a powerlaw model, with alpha = -1.4 +/- 0.1. With this model, the 4-120 keV fluence is (7.4 +/- 0.8)e-7 erg/cm^2 and the 4-120 keV photon flux is (5.7 +/- 0.5)e-1 ph/cm^2/s. \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:  Hui Yang (hui.yang at cnrs.fr) ",
  "eventType": [
    "GRB",
    "X-ray Transient"
  ],
  "subject": "GRB 260917B:: SVOM/ECLAIRs refined analysis"
}