{
  "bibcode": "2013GCN.15357....1V",
  "body": "G. Vianello (Stanford), R. Desiante (University of Udine and INFN Trieste)\nand F.Longo (University of Trieste and INFN Trieste) report on behalf of\nthe Fermi-LAT team:\n\nAt 16:08:39 on 2013-10-18 Fermi LAT detected high energy emission from GRB\n131018B, which was also detected by Fermi-GBM ( trigger bn131018673).\n\nThe best LAT on-ground location is found to be (RA, DEC) = 304.41, 23.11\n(J2000) with an error radius of 0.13 deg (68% containment, statistical\nerror only), which was 25 deg from the LAT boresight at the time of the\ntrigger. This position is 12 deg away from the best available GBM\nlocalization. This can be explained by the large statistical error on the\nGBM position (4 deg) and its typical systematic error, which is of the\norder of few degrees.\n\nThe data from the Fermi LAT show an increase in the event rate within 10\ndegrees of the reported position starting few seconds after the GBM trigger\n(a delay common to many Fermi-LAT GRBs), which behaves spatially and\ntemporally like a new transient point source. This excess has a high\nsignificance (~6 sigma).\n\nMore than 10 photons above 100 MeV are observed within 2000 seconds after\nthe trigger. The highest energy photon is a 13 GeV event which is observed\n250 seconds after the GBM trigger.\n\nA Swift ToO request for this burst has been submitted.\n\nThe Fermi LAT point of contact for this burst is Rachele Desiante (\nrachele.desiante@ts.infn.it).\n\nThe Fermi LAT is a pair conversion telescope designed to cover the energy\nband from 20 MeV to greater than 300 GeV. It is the product of an\ninternational collaboration between NASA and DOE in the U.S. and many\nscientific institutions across France, Italy, Japan and Sweden.",
  "circularId": 15357,
  "createdOn": 1382176956000,
  "email": "giacomov@slac.stanford.edu",
  "subject": "GRB 131018B: Fermi-LAT detection of a burst",
  "submitter": "Giacomo Vianello at SLAC  <giacomov@slac.stanford.edu>",
  "eventId": "GRB 131018B"
}