{
  "bibcode": "2013GCN.15331....1J",
  "body": "P. Jenke (UAH) reports on behalf of the Fermi GBM Team:\n\nAt 17:47:34.99 UT on October 11 2013, the Fermi Gamma-Ray Burst Monitor\ntriggered and located GRB 131011A (trigger 403206457/131011741).\nA candidate optical afterglow was found by iPTF (Kasliwal et al. 2013, GCN\n15324) using the GBM on-ground location.\nAdditional follow-ups confirmed that the optical source has faded (Xu et\nal. 2013, GCN 15325) and has a redshift of \nz = 1.874 (Rau et al. 2013, GCN 15330).  A weak X-ray\nsource consistent with the optical afterglow was detected by the \nSwift XRT (Page et al. 2013, GCN 15329).\n\nThe angle of the burst direction to the Fermi LAT boresight is 74 degrees.\n\nThe GBM light curve consists of one main peak and a small \npost burst with a combined duration (T90) of about 77 s (50-300 keV).\nThe time-averaged spectrum from T0-3 s to T0+25s is\nwell fit by a Band function with Epeak of 220 +/- 30 keV.\nAlpha = -0.79 +/- 0.08 and Beta = -2.0 +/- 0.1.\n\nThe event fluence (10-1000 keV) in this time interval is\n(6.60 +/- 0.03)E-05 erg/cm^2. The 1.0-sec peak photon flux measured\nstarting from T0+4.3 s in the 10-1000 keV band\nis 4.3 +/- 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": 15331,
  "createdOn": 1381709355000,
  "email": "peter.a.jenke@nasa.gov",
  "subject": "GRB 131011A: Fermi GBM detection",
  "submitter": "Peter Jenke at MSFC  <peter.a.jenke@nasa.gov>",
  "eventId": "GRB 131011A"
}