{
  "bibcode": "2018GCN.23183....1R",
  "body": "O.J. Roberts (USRA/NASA) and C. Meegan (UAH) report on behalf\nof the Fermi GBM Team:\n\n\"At 18:57:26.58 UT on 28 August 2018, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 180828A (trigger 557175451 / 180828790),\nwhich was also detected by Swift (Beardmore et al. 2018, GCN 23182).\nThe GBM on-ground location is consistent with the Swift position.\n\nThe angle from the Fermi LAT boresight at the GBM trigger time using the\nSwift-XRT position is 77 degrees.\n\nThe GBM light curve consists of multiple bright pulses with a duration\n(T90) of 8.3 s (50-300 keV). The time-averaged spectrum from T0+1.5s to \nT0+11 s is best fit by a power law function with an exponential\nhigh-energy cutoff.  The power law index is -0.46 +/- 0.02 and the \ncutoff energy, parameterized as Epeak, is 358 +/- 9 keV.\n\nA Band function fits the interval equally well, with \nEpeak =346 +/- 12 keV, alpha = -0.44 +/- 0.03 and\nbeta = -3.01 +/- 0.33.\n\nThe event fluence (10-1000 keV) over the T90 interval is\n(3.39 +/- 0.5)E-05 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0 +8s in the 10-1000 keV band is 38 +/- 1 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 23183,
  "createdOn": 1535516378000,
  "email": "oliver.roberts@nasa.gov",
  "subject": "GRB 180828A: Fermi GBM observation",
  "submitter": "Oliver J Roberts at USRA/NASA  <oliver.roberts@nasa.gov>",
  "eventId": "GRB 180828A"
}