{
  "bibcode": "2016GCN.19580....1D",
  "body": "F. Dirirsa (U. Johannesburg), J. Racusin (NASA/GSFC), J. McEnery (NASA/GSFC), \nand R. Desiante (INFN Torino) report on behalf of the Fermi-LAT team:\n\nAt 22:43:24 on June 25, 2016, Fermi/LAT detected a sharp increase in the rate of \nhigh-energy photons, resulting in an onboard trigger on GRB 160625B.  Fermi/GBM \ntriggered on this object two separate times (160625945/488587220, \n160625952/488587880), with emission evident between triggers, including the time \nat which LAT triggered.\n\nNote that all of these triggers are distinct from the Swift/BAT trigger on GRB160625A \n(Maselli et al., GCN 19577) that occurred 15 seconds after the first GBM trigger, and \nwas occulted by the Earth to Fermi at the time, and >100 degrees away on the sky.\n\nThe onboard location is:\nRA, Dec = 308.3, +6.9  (J2000)\n\nwith an error radius of 0.5 deg (90% containment, systematic error only). \n\nThis was 12.3 deg from the LAT boresight at the time of the LAT trigger. \n\nWe anticipate providing a refined location within the next 8 hours when the LAT \nscience data for this burst is downlinked and processed.\n\nA Swift TOO request has been approved, and given the unusual nature of this trigger, \na Fermi TOO will extended the pointed-mode observations to T0+24 hours beyond the \ninitial autonomous repoint.\n\nThe Fermi-LAT point of contact for this burst is Feraol Dirirsa (fdirirsa@uj.ac.za).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band \nfrom 20 MeV to greater than 300 GeV. It is the product of an international collaboration \nbetween NASA and DOE in the U.S. and many scientific institutions across France, \nItaly, Japan and Sweden.",
  "circularId": 19580,
  "createdOn": 1466900612000,
  "email": "judith.racusin@nasa.gov",
  "subject": "GRB 160625B: Fermi-LAT detection of a bright burst",
  "submitter": "Judith Racusin at GSFC  <judith.racusin@nasa.gov>",
  "eventId": "GRB 160625B"
}