{
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "bibcode": "2025GCN.41726....1M",
  "submittedHow": "web",
  "format": "text/plain",
  "circularId": 41726,
  "body": "Tais Maiolino (LUPM), Frédéric Piron (LUPM), Claire Guépin-Detrigne (LUPM) \n\nUsing the event-by-event data downloaded through the X-band ground station, we report further analysis of ECLAIRs observations of GRB 250901A (SVOM burst-id sb25090101). \n\nThe burst that triggered ECLAIRs (GCN #41634) consists of a single pulse structure with a duration of T90 = 16 +1/-3 s in the 4-120 keV energy band. \n\nThe time-averaged spectrum from T0-8 s to T0+10 s (T0 = 2025-09-01T18:14:22.916) in the energy range 5-120 keV is best fitted by a power-law model with photon index -1.15 +/- 0.09. With this model, the  4-120 keV fluence is (1.4 +/- 0.1) e-06 erg/cm^2. \n\nAll the quoted errors are at the 68% confidence level.\n\nWe note that the calibration of SVOM/ECLAIRs is undergoing thus these results are preliminary\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: Tais Maiolino (LUPM) (tais.maiolino at lupm.in2p3.fr)\n",
  "createdOn": 1757079285569,
  "eventId": "GRB 250901A",
  "subject": "GRB 250901A - SVOM/ECLAIRs refined analysis"
}