{
  "bibcode": "2011GCN.11878....1B",
  "body": "P. N. Bhat (UAH) \nreports on behalf of the Fermi GBM Team:\n\n\"Fermi Gamma-Ray Burst Monitor trigger at 22:04:19.63 UT on 01 April 2011,\ntentatively classified as \"Below Horizon\" by the flight software,\nis in fact due to GRB 110401A (trigger 323388261  / 110401920).\n\nThe on-ground calculated location, using the GBM trigger\ndata, is RA = 268.56, DEC = 26.87 (J2000 degrees,\nequivalent to 17 h 54 m, 26 d 52'), with an uncertainty\nof 3.8 degrees (radius, 1-sigma containment,\nstatistical only; there is additionally a systematic\nerror which is currently estimated to be 2 to 3 degrees).\n \nThe angle from the Fermi LAT boresight is 94 degrees.\n\nThe GBM light curve shows 2 strong pulses\nwith a duration (T90) of about 2 s (50-300 keV).\n\nThe time-averaged spectrum from T0-0.32 s to T0+0.704 s is\nwell fit by a Band function with Epeak = 1194 +/- 406 keV,\nalpha = -0.66 +/- 0.15, and beta = -2.36 +/- 0.53\n\nThe event fluence (10-1000 keV) in this time interval is\n(1.51 +/- 0.09)E-06 erg/cm^2. The 1-sec peak photon flux measured\nstarting from T0-0.256 s in the 10-1000 keV band\nis 3.53 +/- 0.25 ph/s/cm^2.\n\nThe spectral analysis results presented above are preliminary;\nfinal results will be published in the GBM GRB Catalog.\"",
  "circularId": 11878,
  "createdOn": 1301934832000,
  "email": "Narayana.Bhat@nasa.gov",
  "subject": "GRB 110401A: Fermi GBM detection",
  "submitter": "Narayana Bhat at U Alabama/Huntsville/GBM  <Narayana.Bhat@nasa.gov>",
  "eventId": "GRB 110401A"
}