{
  "bibcode": "2014GCN.17205....1Y",
  "body": "H.-F. Yu (MPE) reports on behalf of the Fermi GBM Team:\n\n\"At 06:02:52.49 UT on 20 Dec 2014, the Fermi Gamma-Ray Burst Monitor triggered \nand located GRB 141220A (trigger 141220252/ 141220252), which was also detected\nby Swift (Cummings et al. 2014, GCN 17196). The GBM on-ground location, using \nthe Fermi GBM trigger data, is consistent with the Swift location. The trigger \nresulted in an Autonomous Repoint Request (ARR) that was accepted and the \nspacecraft slewed to the GBM in-flight location. The angle from the Fermi LAT \nboresight is about 47 degrees.\n\nThe GBM light curve consists of two main pulses with a duration (T90) of about \n7.6 s (50-300 keV). The time-averaged spectrum from T0-1.920 s to T0+8.320 s is\nbest fit by a power law function with an exponential high-energy cutoff. The \npower law index is -0.80 +/- 0.05 and the cutoff energy, parameterized as Epeak, \nis 180 +/- 9 keV.\n\nThe event fluence (8-1000 keV) in this time interval is\n(5.23 +/- 0.15)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting \nfrom T0+0.128 s in the 8-1000 keV band is 12.0 +/- 0.3 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 17205,
  "createdOn": 1419135888000,
  "email": "sptfung@mpe.mpg.de",
  "subject": "GRB 141220A: Fermi GBM observation",
  "submitter": "Hoi-Fung Yu at MPE  <sptfung@mpe.mpg.de>",
  "eventId": "GRB 141220A"
}