{
  "bibcode": "2010GCN.11006....1V",
  "body": "A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: \n\n\"At 02:17:30.61 UT on 28 July 2010, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 100728A (trigger 301976252 / 100728095), \nwhich was also detected by the Swift-BAT (Cannizzo et al. 2008, GCN 11004)\n\nThe GBM on-ground location is consistent with the Swift position.\n \nThe angle from the Fermi LAT boresight is 58.6 degrees.\n\nThe GBM light curve shows a multi-peaked structure \nwith a duration (T90) of about  162.9 +/- 0.9 s (50 - 300 keV). \nThe time-averaged spectrum from T0-8.192 s to T0+191.491 s is \nwell fit by a power law function with an exponential\nhigh energy cutoff.  The power law index is -0.76 +/- 0.01 and\nthe cutoff energy, parameterized as Epeak, is 353.7 +/- 6.7 keV\n(Castor C-STAT 3540 for 727 d.o.f.) .\n\nThe event fluence (8-1000 keV) in this time interval is \n(1.291 +/- 0.008)E-04 erg/cm^2. The 1.024-sec peak photon flux measured \nstarting from T0+80.2 s in the 8-1000 keV band is 10.8 +/- 0.2 ph/s/cm^2.\n\nA Band function fits the spectrum equally well (Castor C-STAT 3537 for 726\nd.o.f.) with Epeak= 344.3 +9.1/-7.9 keV, alpha = -0.75 +/- 0.01 and \nbeta = -3.04 +0.23/-0.57. \n\nThe spectral analysis results presented above are preliminary; \nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 11006,
  "createdOn": 1280311561000,
  "email": "azk@mpe.mpg.de",
  "subject": "GRB 100728A: Fermi GBM observation",
  "submitter": "Andreas von Kienlin at MPE  <azk@mpe.mpg.de>",
  "eventId": "GRB 100728A"
}