{
  "bibcode": "2017GCN.20532....1G",
  "body": "Adam Goldstein (USRA) and Colleen Wilson-Hodge (NASA/MSFC) report on\nbehalf of the GBM-LIGO Group:\nLindy Blackburn (CfA), Michael S. Briggs (UAH), Jacob Broida (Carleton\nCollege),\nEric Burns (UAH), Jordan Camp (NASA/GSFC), Tito Dal Canton (NASA/GSFC),\nNelson Christensen (Carleton College), Valerie Connaughton (USRA),\nRachel Hamburg (UAH), C. Michelle Hui (NASA/MSFC), Pete Jenke (UAH),\nDan Kocevski (NASA/MSFC), Nicolas Leroy (LAL), Tyson Littenberg\n(NASA/MSFC),\nJulie McEnery (NASA/GSFC), Rob Preece (UAH), Judith Racusin (NASA/GSFC),\nPeter Shawhan (UMD), Karelle Siellez (GA Tech), Leo Singer (NASA/GSFC),\nJohn Veitch (Birmingham), Peter Veres (UAH)\n\nAs mentioned by Kocevski et al. (GCN 20499), Fermi was passing through the\nSouth Atlantic Anomaly at the time of the LIGO trigger, and therefore the\nGBM\ndetectors were disabled.\n\nUsing the Earth Occultation technique (Wilson-Hodge et al. 2012, ApJS, 201,\n33)\nto estimate the amount of persistent emission during a 48-hour period\ncentered\non the LIGO trigger time, we place the following range of 3-sigma\nday-averaged\nflux upper limits based on observed sources over the entire LIGO sky map:\n\nEnergy       min  max  median\n--------------------------------\n 12- 27 keV: 0.09 0.34 0.11 Crab\n 27- 50 keV: 0.13 0.42 0.17 Crab\n 50-100 keV: 0.20 0.70 0.26 Crab\n100-300 keV: 0.32 1.28 0.43 Crab\n300-500 keV: 2.58 13.2 3.64 Crab\n\nThese limits are based on the minimum requirement that each source in the\nEarth\nOccultation catalog was Earth-occulted at least 6 times in each of the 24\nhour\nperiods preceding and following the LIGO trigger and that the occultations\nwere\nwell separated from nearby bright sources.",
  "circularId": 20532,
  "createdOn": 1485452180000,
  "email": "adam.michael.goldstein@gmail.com",
  "subject": "LIGO/Virgo G270580: Fermi GBM Observations",
  "submitter": "Adam Goldstein at Fermi/GBM  <adam.michael.goldstein@gmail.com>",
  "eventId": "LIGO/Virgo G270580"
}