{
  "bibcode": "2009GCN..9535....1M",
  "body": "Sheila McBreen (UCD/MPE)\nreports on behalf of the Fermi GBM Team:\n\n\"At 08:28:26.66 UT on 18 June 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 090618 (trigger 267006508 / 090618353)\nwhich was also detected by Swift/BAT (Schady et al. 2009, GCN 9512)\nand AGILE (Longo et al. 2009, GCN 9524).\nThe GBM on-ground location is consistent with the Swift position.\nThe angle from the Fermi LAT boresight is 133 degrees.\n\nThe GBM light curve consists of 4 pulses\nwith a duration of about 155 s (8-1000 keV).\nThe time-averaged spectrum from T0 to T0+140 s is\nadequately fit by a Band function with Epeak = 155.5 (+11.1/-10.5) keV,\nalpha = -1.26 (+0.06/-0.02), and beta = -2.50 (+0.15/-0.33).\nWe observe significant spectral evolution within the fitted\ntime interval.\n\nThe event fluence (8-1000 keV) in this time interval is\n(2.70 +/- 0.06)E-4 erg/cm^2.  Using standard cosmology\n(Omega_matter = 0.27, Omega_lambda = 0.73, H0=71)\nand the reported redshift of 0.54 (Cenko et al. 2009, GCN 9518)\nthe isotropic equivalent energy in the 8-1000 keV band is\nE_iso = 2.0E+53 erg.\n\nThe 1-sec peak photon flux measured starting from T0+63 s\nin the 8-1000 keV band is  73.4 +/- 2.0 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9535,
  "createdOn": 1245452139000,
  "email": "smcbreen@mpe.mpg.de",
  "subject": "GRB 090618: Fermi GBM observation",
  "submitter": "Sheila McBreen at MPE  <smcbreen@mpe.mpg.de>",
  "eventId": "GRB 090618"
}