{
  "bibcode": "2009GCN..9534....1S",
  "body": "T. Sakamoto (GSFC/UMBC), T. N. Ukwatta (GWU/GSFC),\nS. D. Barthelmy (GSFC), (i.e. the Swift-BAT team):\n\nUsing the data set from T-373 to T+962 sec from the\nrecent telemetry downlink, we report further spectral\nanalysis of BAT GRB 090618 (trigger #355083)\n(Schady, et al., GCN Circ. 9512).\n\nThe time-averaged spectrum from T-4.4 to T+213.6 sec\nis best fit by a power law with an exponential cutoff.\nThis fit gives a photon index 1.42 +/- 0.08,\nand Epeak of 134 +/- 19 keV (chi squared 14.6\nfor 56 d.o.f.).  For this model the total fluence in\nthe 15-150 keV band is 1.05 +/- 0.01 x 10^-04 erg/cm2\nand the 1-sec peak flux measured from T+65.38 sec in\nthe 15-150 keV band is 38.8 +/- 0.8 ph/cm2/sec.\nA fit to a simple power law gives a photon index\nof 1.72 +/- 0.02 (chi squared 55.8 for 57 d.o.f.).\nAll the quoted errors are at the 90% confidence level.\n\nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/355083/BA/",
  "circularId": 9534,
  "createdOn": 1245435180000,
  "email": "tilan.ukwatta@gmail.com",
  "subject": "GRB 090618, Swift-BAT refined spectral analysis",
  "submitter": "Tilan Ukwatta at GSFC/GWU  <tilan.ukwatta@gmail.com>",
  "eventId": "GRB 090618"
}