{
  "bibcode": "2009GCN..9974....1G",
  "body": "D. Gruber (MPE), E. Bissaldi (MPE) and S. McBreen (UCD/MPE)\nreport on behalf of the Fermi GBM Team:\n\n\n\"At 10:07:17.21 UT on 27 September 2009, the Fermi Gamma-Ray Burst  \nMonitor\ntriggered and located GRB 090927 (trigger 275738839 / 090927422),\nwhich was also detected by the Swift-BAT (Grupe al. 2009, GCN 9945).\nThe GBM on-ground location is consistent with the Swift position.\nThe angle from the Fermi LAT boresight is 85 degrees.\n\nThe GBM light curve consists of one weak pulse with\na duration of about 2 seconds.\nThe time-averaged spectrum from T0-0.256 s to T0+0.896 s is\nadequately fit by a simple power law function\nwith index -1.47 +/- 0.06 (C-stat 330 for 239 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(6.1 +/- 0.5)E-07 erg/cm^2. The 128-msec peak photon flux measured\nstarting from T0-0.128 s in the 8-1000 keV band\nis 7.2 +/- 0.9 ph/s/cm^2.\n\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 9974,
  "createdOn": 1254315706000,
  "email": "dgruber@mpe.mpg.de",
  "subject": "GRB 090927: Fermi GBM observation",
  "submitter": "David Gruber at MPE  <dgruber@mpe.mpg.de>",
  "eventId": "GRB 090927"
}