{
  "bibcode": "2019GCN.26119....1F",
  "body": "C. Fletcher (USRA), R. Hamburg (UAH) and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 18:43:16.71 UT on 31 October 2019, the Fermi Gamma-Ray Burst Monitor (GBM)\ntriggered and located GRB 191031C (trigger 594240201 / 191031780)\nwhich was also detected by the Swift BAT and XRT (Ambrosi et al. 2019, GCN 26108).\nThe Fermi GBM Final Real-time Localization (GCN 26107) is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time is 20 degrees.\n\nThe GBM light curve shows a complex, multi-peaked structure\nwith a duration (T90) of about 78 s (50-300 keV).\nThe time-averaged spectrum from T0+3.3  s to T0+81.2 s is\nbest fit by a Band function with Epeak = 107 +/- 9 keV,\nalpha = -0.5 +/- 0.1, and beta = -2.3 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.33 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+42.2 s in the 10-1000 keV band\nis 7.3 +/- 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:\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": 26119,
  "createdOn": 1572580112000,
  "email": "cfletcher@usra.edu",
  "subject": "GRB 191031C: Fermi GBM detection",
  "submitter": "Cori Fletcher at USRA  <cfletcher@usra.edu>",
  "eventId": "GRB 191031C"
}