{
  "bibcode": "2017GCN.21032....1O",
  "body": "N. Omodei, G.Vianello (Stanford University), report on behalf of the Fermi-LAT team:\n\nAt 10:12:30.75 on April, 24, 2017 Fermi-LAT detected high-energy emission from GRB 170424A, which was also detected by Fermi-GBM (trigger 514721555 / 170424425).\n\nThe best LAT on-ground location is found to be\n\nRA, Dec = 343.7, -45.12 (J2000)\n\nwith an error radius of 0.45 deg (90 % containment, statistical error only). \n\nThis was 57 deg from the LAT boresight at the time of the trigger.\n\nThe data from the Fermi-LAT show a significant increase in the event rate that is spatially and temporally correlated with the trigger with high significance. \n\nThe highest-energy photon is a 1 GeV event which is observed 56 seconds after the GBM trigger. \n\nThe GRB was also detected using LAT Low Energy (LLE) data selection, with a significance of 6 sigma. \n\nA Swift ToO has been requested for this burst.\n\nThe Fermi-LAT point of contact for this burst is Nicola Omodei (nicola.omodei@stanford.edu).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.",
  "circularId": 21032,
  "createdOn": 1493071223000,
  "email": "nicola.omodei@slac.stanford.edu",
  "subject": "GRB 170424A: Fermi-LAT detection",
  "submitter": "Nicola Omodei at Stanford U.  <nicola.omodei@slac.stanford.edu>",
  "eventId": "GRB 170424A"
}