{
  "bibcode": "2018GCN.23118....1B",
  "body": "E. Bissaldi (Politecnico & INFN Bari)\nreports on behalf of the Fermi GBM Team:\n\n\n\"At 11:38:12.08 UT on 9 August 2018, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 180809A (trigger 555507497 / 180809485),\nwhich was also detected by MAXI/GSC (Yatabe et al. 2018, GCN 23103) and\nSwift/XRT (D'Elia et al. 2018, GCN 23106).\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 60 degrees.\n\nThe GBM light curve consists of multiple emission episodes\nwith a duration (T90) of about 220 s (50-300 keV).\nThe time-averaged spectrum of the main emission episode\nfrom T0-5 s to T0+15 s is adequately fit by a power law\nfunction with an exponential high-energy cutoff.\nThe power law index is -1.37 +/- 0.06 and the cutoff energy,\nparameterized as Epeak, is 620 +/- 230 keV.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.8 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+3.2 s in the 10-1000 keV band is 4.0 +/- 0.3 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": 23118,
  "createdOn": 1533906048000,
  "email": "elisabetta.bissaldi@ba.infn.it",
  "subject": "GRB 180809A: Fermi GBM observation",
  "submitter": "Elisabetta Bissaldi at INFN,Bari  <elisabetta.bissaldi@ba.infn.it>",
  "eventId": "GRB 180809A"
}