{
  "subject": "GRB 240115A: Fermi GBM Observation",
  "eventId": "GRB 240115A",
  "submittedHow": "web",
  "bibcode": "2024GCN.35578....1H",
  "circularId": 35578,
  "createdOn": 1705678592338,
  "body": "R. Hamburg (CNRS/IN2P3) and C. Meegan (UAH) report on behalf of\nthe Fermi Gamma-ray Burst Monitor Team:\n\n\"At 11:03:14.11 UT on 15 January 2024, the Fermi Gamma-ray Burst Monitor (GBM)\ntriggered and located GRB 240115A (trigger 727009399/240115461),\nwhich was also detected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35557).\nThe Fermi Final Real-time Localization is reported in GCN 35537.\n\nThe angle from the Fermi LAT boresight is 37 degrees.\n\nThe GBM light curve consists of one main pulse with a duration (T90)\nof about 1.79 s (50-300 keV). The time-averaged spectrum\nfrom T0-0.26 to T0+0.77 s is best fit by a power law function \nwith an exponential high-energy cutoff.\nThe power law index is -0.7 +/- 0.2 and the cutoff energy,\nparameterized as Epeak, is 450 +/- 137 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(4.8 +/- 0.6)E-07 erg/cm^2. The 64-ms peak photon flux measured\nstarting from T0+0.64 s in the 10-1000 keV band is 3.4 +/- 1.0 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/\"",
  "submitter": "rachel.hamburg@ijclab.in2p3.fr"
}