{
  "bibcode": "2013GCN.14971....1C",
  "body": "T. Cheung (NRL), G.Vianello (Stanford), S. Zhu (NASA/GSFC), J. Racusin\n(NASA/GSFC), V. Connaughton (UAH) and B. Carpenter (NASA/GSFC) report\non behalf of the Fermi-LAT team:\n\nAt 00:05:23.079 UTC on July 02, 2013, Fermi GBM triggered on GRB\n130702A / Fermi394416326 (trigger 394416326). The LAT detected high\nenergy emission from this GRB, which was also detected in the optical\nband by iPTF (Singer et al., GCN 14967) and confirmed by FTN (Guidorzi\net al., GCN 14968).\n\nThe best LAT on-ground location is found to be:\n\nRA, DEC = 216.4, 15.8 (J2000), with an error radius of 0.5 deg (90%\ncontainment, statistical error only)\n\nThis position is 4 deg from the best GBM position (RA, Dec = 218.81,\n+12.25 with a 4 deg radius), and 0.8 deg from the position of the\noptical afterglow. A preliminary IPN triangulation of the burst using\nGBM and Konus-Wind data gives an annulus with center RA, DEC =\n260.8992, -20.7746 (J2000) of radius 50.85 degrees and a width of\n(-32.73,+18.42) deg (3 sigma). The center of this annulus is 6.05 deg\n(0.99 sigma) from the LAT location (Private Communication, with\npossible IPN refinements using data from distant spacecraft).\n\nThe best LAT localization for the source was ~75 deg from the LAT\nboresight at the time of the trigger, i.e., outside the nominal field\nof view of the LAT (~65 deg), but it entered the FOV at T0+250 s to\nexit again at T0 + 2200 s.\n\nThe data from the Fermi LAT in such time interval show a significant\nincrease in the event rate within 10 degree of the source location,\nwith a significance of more than 5 sigmas. This analysis has been\ncarried out with the P7SOURCE_V6 class. More than 5 photons above 100\nMeV are observed within 2200 seconds. The highest energy photon is a\n1.5 GeV event which is observed 260 seconds after the GBM trigger.\n\nThe Fermi LAT point of contact for this burst is Giacomo Vianello\n(giacomov@stanford.edu).\n\nThe Fermi LAT is a pair conversion telescope designed to cover the\nenergy band from 20 MeV to greater than 300 GeV. It is the product of\nan international collaboration between NASA and DOE in the U.S. and\nmany scientific institutions across France, Italy, Japan and Sweden.",
  "circularId": 14971,
  "createdOn": 1372872868000,
  "email": "giacomov@slac.stanford.edu",
  "subject": "GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst",
  "submitter": "Giacomo Vianello at SLAC  <giacomov@slac.stanford.edu>",
  "eventId": "GRB 130702A"
}