{
  "bibcode": "2017GCN.22277....1S",
  "body": "M. Stanbro (UAH), C. M. Hui (NASA/MSFC) and C. Meegan (UAH)\nreports on behalf of the Fermi GBM Team:\n\nAt 16:25:10.54 UT on 22 December 2017, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 171222A (trigger 535652715/171222684) which\nwas also detected by the Swift/BAT and XRT (Racusin et al. 2017, GCN 22265).\nThe GBM on-ground location is consistent with the Swift position.\nThe angle from the Fermi LAT boresight is 43 degrees.\n\nThe GBM light curve shows a single peak with a duration (T90)\nof about 80.4s (50-300 keV).  The time-averaged spectrum from\nT0+0.0s to T0+78.8s is adequately fit by a power law function with\nan exponential high-energy cutoff.  The power law index is\n-1.09+/- 0.27 and the cutoff energy, parameterized as Epeak,\nis 29.18 +/- 2.73 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.27 +/- 0.13)E-06 erg/cm^2. The 1s peak photon flux measured\nstarting from T0+60.1s in the 10-1000 keV band is 2.3 +/- 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.",
  "circularId": 22277,
  "createdOn": 1514049200000,
  "email": "mcs0001@uah.edu",
  "subject": "GRB 171222A: Fermi GBM detection",
  "submitter": "Matthew Stanbro at UAH/Fermi  <mcs0001@uah.edu>",
  "eventId": "GRB 171222A"
}