{
  "bibcode": "2018GCN.22875....1H",
  "body": "R. Hamburg (UAH), A. von Kienlin (MPE), and C. Meegan (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 11:11:54.41 UT on 30 June 2018, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 180630A (trigger 552049919 / 180630467)\nwhich was also detected by the Swift BAT and XRT instruments\n(D'Avanzo et al. 2018, GCN 22872).\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 20\ndegrees.\n\nThe GBM light curve consists of a single structured peak\nwith a duration (T90) of about 12 s (50-300 keV).\nThe time-averaged spectrum from T0-1.54s to T0+8.70 s is\nbest fit by a power law function with an exponential\nhigh-energy cutoff. The power law index is -1.37 +/- 0.09 and\nthe cutoff energy, parameterized as Epeak, is 84 +/- 8 keV.\nA Band function fits the spectrum equally well\nwith Epeak = 60 +/- 10 keV, alpha = -1.11 +/- 0.20,\nand beta = -2.32 +/- 0.16.\n\nThe event fluence (10-1000 keV) in this time interval is\n(2.5 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0+1.15 s in the 10-1000 keV band\nis 9.4 +/- 0.4 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 22875,
  "createdOn": 1530377655000,
  "email": "rkh0007@uah.edu",
  "subject": "GRB 180630A: Fermi GBM detection",
  "submitter": "Rachel Hamburg at UAH  <rkh0007@uah.edu>",
  "eventId": "GRB 180630A"
}