{
  "bibcode": "2017GCN.21004....1L",
  "body": "F. Longo (University and INFN, Trieste), J. L. Racusin (NASA/GSFC), and \nD. Kocesvki (NASA/MSFC)report on behalf of the Fermi-LAT team:\n\nAt 02:41:59.49 on April 9, 2017, Fermi-LAT detected high-energy emission \nfrom GRB 170904A, which was also detected by Fermi-GBM (trigger \n513398525/170409112). \n\nThe best LAT on-ground location is found to be:\n\nRA, Dec = 347.53, -7.16 (degrees, J2000)\n\nwith an error radius of 0.15 deg (90% containment, statistical error only). This \nwas 82 deg from the LAT boresight at the time of the trigger and triggered an \nautonomous repoint of the spacecraft.\n\nThe data from the Fermi-LAT show a significant increase in the event rate that \nis spatially and temporally consistent with the GBM emission. More than 14 \nphotons above 100 MeV and 2 photons above 1 GeV are observed within 1000 \nseconds.  The highest-energy photon is a 10 GeV event which is observed 442 \nseconds after the GBM trigger.\n\nA Swift ToO has been requested for this burst.\n\nThe Fermi-LAT point of contact for this burst is Francesco Longo \n(francesco.longo@ts.infn.it).\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 \ncollaboration between NASA and DOE in the U.S. and many scientific institutions \nacross France, Italy, Japan and Sweden.",
  "circularId": 21004,
  "createdOn": 1491752934000,
  "email": "judith.racusin@nasa.gov",
  "subject": "GRB 170409A: Fermi-LAT detection",
  "submitter": "Judith Racusin at GSFC  <judith.racusin@nasa.gov>",
  "eventId": "GRB 170409A"
}