{
  "bibcode": "2013GCN.15113....1J",
  "body": "P. Jenke (UAH) reports on behalf of the Fermi GBM Team:\n\n\"At 16:10:28.011 UT on August 21 2013, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 130821A (trigger 398794231/130821674),\nwhich resulted in an Autonomous Repoint Request (ARR) that was accepted and\nthe LAT slewed to the GBM position.\nThe GBM on-ground location, using the Fermi GBM trigger\ndata, is RA = 308.2, Dec = -15.5 (J2000 degrees, equivalent to\nJ2000 20h 32m, -15d 30'), with a statistical uncertainty of 1 degree\n(radius, 1-sigma containment, statistical only; there is additionally\na systematic error which is currently estimated to be 2 to 3 degrees).\n\nThe angle of the burst direction to the Fermi LAT boresight is 37 degrees.\n\nThe GBM light curve consists of multiple peaks\nwith a duration (T90) of about 84 s (50-300 keV).\nThe time-averaged spectrum from T0-3 s to T0+49 s is\nwell fit by a Band function with Epeak of 165 +/- 5 keV,\nAlpha = -0.54 +/- 0.03 and Beta = -2.01 +/- 0.02.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.60 +/- 0.08)E-05 erg/cm^2. The 1.0-sec peak photon flux measured\nstarting from T0+32 s in the 10-1000 keV band\nis 27.6 +/- 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.\"\n\n[GCN OPS NOTE(25aug13); Per operator's request, the \"A\" suffix\nwas added to the GRB name.]",
  "circularId": 15113,
  "createdOn": 1377190278000,
  "email": "peter.a.jenke@nasa.gov",
  "subject": "GRB 130821A: Fermi GBM Detection",
  "submitter": "Peter Jenke at MSFC  <peter.a.jenke@nasa.gov>",
  "eventId": "GRB 130821A"
}