{
  "bibcode": "2019GCN.26599....1P",
  "body": "S.Poolakkil(UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 01:39:24.72 UT on 27 December 2019, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 191227A(trigger 599103569 / 191227069),\nwhich was also detected by the Swift/BAT (Melandri et al. 2019, GCN 26595)\nand Fermi LAT (Fana Dirirsa et al. 2019, GCN 26598).\nThe GBM on-ground location is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 96\ndegrees.\n\nThe GBM light curve consists of multiple overlapping pulses\nwith a duration (T90) of about 25 s (50-300 keV).\nThe time-averaged spectrum from T0+8.19 s to T0+37.88 s is\nbest fit by a Band function with Epeak = 362 +/- 10 keV,\nalpha = -0.93 +/- 0.01 and beta = -2.36 +/- 0.07.\n\nThe event fluence (10-1000 keV) in this time interval is\n(7.30 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux\nmeasured starting from T0+15.8 s in the 10-1000 keV band\nis 38.0 +/- 0.5 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\nPage:\nhttps://fermi.gsfc.nasa.gov/ssc/data/access/gbm/\"",
  "circularId": 26599,
  "createdOn": 1577486674000,
  "email": "sp0076@uah.edu",
  "subject": "GRB 191227A: Fermi GBM detection",
  "submitter": "Suraj Poolakkil at UAH  <sp0076@uah.edu>",
  "eventId": "GRB 191227A"
}