{
  "subject": "GRB 251013C: Fermi GBM Observation",
  "eventId": "GRB 251013C",
  "createdOn": 1760456136636,
  "bibcode": "2025GCN.42259....1S",
  "submitter": "Jacob Smith at Fermi-GBM Team <jrs0118@uah.edu>",
  "body": "Jacob Smith (UAH), E. Palafox (INAOE), and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 17:39:41.94 UT on 13 October 2025, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 251013C (trigger 782069986/251013736),\nwhich was also detected by SVOM (N. A. Rakotondrainibe et al. 2025, GCN 42222) and Swift XRT (P.A. Evans et al. 2025, GCN 42232).\nThe Fermi GBM on-ground location is consistent with the Swift BAT position.\nNOT measured a spectroscopic redshift z = 0.572 (A. Martin-Carrillo et al. 2025, GCN 42227).\n\nThe angle from the Fermi LAT boresight is 60 degrees.\n\nThe GBM light curve consists of a single emission episode with a duration (T90)\nof about 12 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.1 to T0+4.0 s is best fit by\na simple power law function with index -1.50 +/- 0.02.\nA Comptonized function fits equally well with Epeak = 7291.00 +/- 4840.00 and alpha = -1.46 +/- 0.03.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.4 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+0.32 s in the 10-1000 keV band is 5 +/- 0.2 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/\"",
  "circularId": 42259,
  "submittedHow": "web",
  "format": "text/plain"
}