{
  "bibcode": "2008GCN..8664....1W",
  "body": "Colleen A. Wilson-Hodge (NASA/MSFC) and Valerie Connaughton (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 23:41:56.39 UT on 9 December 2008, the Fermi Gamma-Ray Burst Monitor\n(GBM) triggered and located GRB 081209 (trigger 250558317 / 081209981).\n\nThe on-ground calculated location, using the GBM trigger data, is\nRA = 45.3, DEC = 63.5 (J2000 degrees, equivalent to 02 h 20 m, 68 d 52'),\nwith an uncertainty of 4.9 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic error which is\ncurrently estimated to be 2 to 3 degrees). This location overlaps the IPN\narc reported in Golenetskii et al. 2008 (GCN Circular #8646).\n \nThe angle from the Fermi LAT boresight is 109 degrees.\n\nThe GBM light curve consists of a single peak with a duration (T90) of\nabout 0.4 s (8-1000 keV). The time-averaged spectrum from T0-0.110 s to\nT0+0.210 s is best fit by a Band function with Epeak = 808 +/- 163 keV,\nalpha = -0.5 +/- 0.1, and beta = -2.0 +/- 0.1. (chi squared 321.85 for\n360 d.o.f.).\n\nThe event fluence (8-1000 keV) in this time interval is\n(5.9 +/- 0.3)E-07 erg/cm^2. The 1-sec photon flux measured starting from\nT0-0.110 s in the 8-1000 keV band is 7.8 +/- 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": 8664,
  "createdOn": 1229117042000,
  "email": "colleen.wilson@nasa.gov",
  "subject": "GRB 081209: Fermi GBM detection",
  "submitter": "Colleen A. Wilson at NASA/MSFC/NSSTC  <colleen.wilson@nasa.gov>",
  "eventId": "GRB 081209"
}