{
  "editedBy": "Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Eva MP <eva.palafox@gmail.com>",
  "eventId": "GRB 251013D",
  "subject": "GRB 251013D: Fermi GBM Observation",
  "submitter": "Eva MP <eva.palafox@gmail.com>",
  "version": 2,
  "bibcode": "2025GCN.42280....1P",
  "circularId": 42280,
  "createdOn": 1760504917147,
  "format": "text/plain",
  "body": "E. Palafox (INAOE) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 18:17:00.39 UT on 13 October 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 251013D (trigger 782072225/251013762).\nwhich was also detected by Swift BAT (J. DeLaunay et al. 2025, GCN 42244).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\n\nThe angle from the Fermi LAT boresight is 70 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 42 s (50-300 keV). \nThe time-averaged spectrum from T0-2.0 to T0+53.2 s is best fit by a Comptonized function with Epeak = 129 +/- 12 keV, alpha = -0.9 +/- 0.1.\nA Band function fits equally well with Epeak = 103 +/- 16 and alpha = -0.8 +/- 0.2, and \nbeta -2.3 +/- 0.2.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.4 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.9 s in the 10-1000 keV band is 0.83 +/- 0.03 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog:\nhttps://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html\n\nFor Fermi GBM data and info, please visit the official Fermi GBM Support Page:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "editedOn": 1760558933220,
  "submittedHow": "web"
}