{
  "bibcode": "2016GCN.19553....1V",
  "body": "G. Vianello (Stanford), F. Dirirsa (UJ), N. Omodei (Stanford), J. L.\nRacusin (NASA/GSFC), M. Axelsson (KTH Stockholm), D.Kocevski\n(NASA/GSFC)\n\nreport on behalf of the Fermi-LAT team:\n\nAt 05:00:34.23 UT on June, 23, 2016 Fermi-GBM triggered on GRB 160623A\n(trigger 488350837 / 160623209).  This burst is also visible in the\nSwift/BAT raw count rate light curve, during a slew with no event\ncapture (D. Palmer/Swift private communication).\n\nAs the source came into the field of view of Fermi-LAT 400 s later,\nhigh-energy emission was detected at a position compatible with GRB\n160623A.\n\nThe best LAT on-ground location is found to be\n\nRA, Dec = 315.24, 42.27 deg (J2000)\n\nwith an error radius of 0.1 deg (90 % containment, statistical error only).\n\nThe source is very bright in the LAT, with a fading high-energy\nemission detected up to approximately 12 ks after the trigger time. We\ndetect more than 15 photons above 1 GeV.\n\nWe note that the LAT position is close to the Galactic plane,\ncorresponding to (L,B) = (84.17, -2.69) deg. Given the large\nuncertainty in the GBM localization, we cannot exclude at this stage\nthe possibility that the LAT transient is a Galactic transient\nunrelated to the GBM GRB. However, as seen by the LAT, the transient\nhas spectral and temporal properties typical of a long GRB.\n\nA Swift ToO has been requested for this burst.\n\nThe Fermi-LAT point of contact for this burst is Feraol Dirirsa\n(fdirirsa@uj.ac.za)\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": 19553,
  "createdOn": 1466698695000,
  "email": "giacomov@slac.stanford.edu",
  "subject": "GRB 160623A / Galactic transient: Fermi-LAT detection",
  "submitter": "Giacomo Vianello at SLAC  <giacomov@slac.stanford.edu>",
  "eventId": "GRB 160623A"
}