{
  "bibcode": "2020GCN.29161....1W",
  "body": "J. Wood (NASA/MSFC) reports on behalf of the Fermi GBM Team:\n\n\"At 17:58:25.69 UT on 23 December 2020, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 201223A (trigger 630439110 / 201223749)\nwhich was also detected by the Swift/BAT and Swift/XRT\n(Gropp et al. 2020, GCN 29158). The GBM\non-ground location is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 63 degrees.\n\nThe GBM light curve shows multiple peaks\nwith a duration (T90) of about 33 s (50-300 keV).\nThe time-averaged spectrum from T0-17 s to T0+13 s is\nbest fit by a Band function with Epeak = 86 +/- 12 keV, \nalpha = 0.14 +/- 0.38 and beta = -2.6 +/- 0.4.\nA power law function with an exponential\nhigh-energy cutoff fits the spectrum equally well.\nThe power law index is -0.14 +/- 0.24 and\nthe cutoff energy, parameterized as Epeak, is 99 +/- 8 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.1 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+4.1 s in the 10-1000 keV band\nis 2.4 +/- 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": 29161,
  "createdOn": 1608767610000,
  "email": "joshua.r.wood@nasa.gov",
  "subject": "GRB 201223A: Fermi GBM Detection",
  "submitter": "Joshua Wood at MSFC/Fermi-GBM  <joshua.r.wood@nasa.gov>",
  "eventId": "GRB 201223A"
}