{
  "bibcode": "2010GCN.10945....1P",
  "body": "Veronique Pelassa (LPTA), Melissa Pesce-Rollins (INFN-Pisa) report on\nbehalf of the Fermi LAT collaboration:\n\nThe Fermi Large Area Telescope (LAT) detected emission from GRB\n100707A (C. Wilson-Hodge et al, GCN 10944).\n\nThis burst was at an angle of 90 degrees to the LAT boresight, which\nmeans that neither directional nor energy information can be obtained\nwith the standard analysis procedures.\n\nUsing a non-standard data selection, the LAT light curve shows a\nsingle, sharply rising pulse that has a somewhat more gradual decay,\nsimilar to the initial peak in the GBM light curve. The LAT T90\nduration is <30 s. This is shorter than the GBM T90 (82+/-1 s), but\nthe LAT may be missing a long tail at later times owing to noisier\ndata. Over 300 counts above background were detected within a 5 s\ninterval in coincidence with the main GBM peak. The significance of\nthis excess was greater than 14 sigma. A preliminary study of the\ninstrument performance at such a large inclination suggests that these\nevents are likely to be low energy gamma-rays, with energies less than\n200 MeV.\n\nFurther analysis is ongoing.\n\nThe Fermi LAT point of contact for this burst is Veronique Pelassa\n(pelassa@lpta.in2p3.fr).\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.\nThis message can be cited.",
  "circularId": 10945,
  "createdOn": 1278540189000,
  "email": "jchiang@slac.stanford.edu",
  "subject": "GRB 100707A: Fermi LAT detection",
  "submitter": "James Chiang at SLAC  <jchiang@slac.stanford.edu>",
  "eventId": "GRB 100707A"
}