{
  "bibcode": "2018GCN.23598....1V",
  "body": "P. Veres, R. Hamburg and C. Meegan (all UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 03:27:43.75 UT on 31 December 2018, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 181231A (trigger 567919668 / 181231144)\nwhich was also detected by Fermi/LAT (Dirirsa et al., GCN 23597).\nThe GBM on-ground location is consistent with the LAT position.\n\nThe GBM light curve shows multiple peaks\nwith a duration (T90) of about 37 s (50-300 keV).\nThe time-averaged spectrum from T0-7.2 s to T0+30.7 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.63 +/- 0.13 and\nthe cutoff energy, parameterized as Epeak, is 215 +/- 25 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.23 +/- 0.46)E-6 erg/cm^2. The 1 second peak photon flux measured\nstarting from T0+14.3 s in the 10-1000 keV band\nis 2.70 +/- 0.27 ph/s/cm^2.\n\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 23598,
  "createdOn": 1546282572000,
  "email": "veresp@gmail.com",
  "subject": "GRB 181231A: Fermi GBM detection",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "GRB 181231A"
}