{
  "submitter": "Elisabetta Bissaldi at Politecnico and INFN Bari <elisabetta.bissaldi@ba.infn.it>",
  "body": "E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\n\"At 07:53:55.52 UT on 14 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 231214B (trigger 724233240 / 231214329),\nwhich was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2023, GCN 35340).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 137.9, DEC = -13.4 (J2000 degrees,\nequivalent to 09h 11m 36, -13d 24'), with a statistical uncertainty\nof 6.3 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which we have characterized as a core-plus-tail model, with 90% of\nGRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg\nsystematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 78 degrees.\n\nThe GBM light curve shows a single weak and structured emission episode\nwith a duration (T90) of about 39 s (50-300 keV).\nThe time-averaged spectrum from T0-2 s to T0+39 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is 0.30 +/- 0.19 and\nthe cutoff energy, parameterized as Epeak, is 148 +/- 15 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(3.02 +/- 0.24)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0 in the 10-1000 keV band\nis 1.56 +/- 0.17 ph/s/cm^2.\n\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/\"",
  "createdOn": 1702975345625,
  "bibcode": "2023GCN.35400....1B",
  "submittedHow": "web",
  "subject": "GRB 231214B: Fermi GBM observation",
  "circularId": 35400,
  "eventId": "GRB 231214B"
}