{
  "bibcode": "2019GCN.25020....1A",
  "body": "M. Axelsson (KTH and Stockholm Univ.) and\nE. Bissaldi (Politecnico and INFN Bari)\nreport on behalf of the Fermi-LAT Collaboration:\n\n\n\"We have searched data collected by the Fermi Large Area Telescope (LAT)\non July 1, 2019, for possible high-energy (E > 100 MeV) gamma-ray emission\nin spatial/temporal coincidence with the LIGO/Virgo trigger S190701ah (GCN 24950).\n\nWe define \"instantaneous coverage\" as the integral over the region\nof the LIGO probability map that is within the LAT field of view\nat a given a time, and \"cumulative coverage\" as the integral\nof the instantaneous coverage over time.\nFermi-LAT had instantaneous coverage of the full\nLIGO probability region at the time of the trigger\n(T0 = 2019-07-01 20:33:06.578 UTC).\n\nWe performed a search for a transient counterpart\nwithin the observed region of the 90% contour\nof the LIGO map in a fixed time window from T0 to T0+10 ks.\nNo significant sources were found.\nWe also performed a search which adapted the time interval\nof the analysis to the exposure of each region of the sky,\nand no additional excesses were found.\n\nEnergy flux upper bounds for the fixed time interval\nbetween 100 MeV and 1 GeV for this search vary\nbetween 3.4e-10 and 1.2e-09 [erg/cm^2/s].\n\nThe Fermi-LAT point of contact for this event is\nElisabetta Bissaldi (elisabetta.bissaldi@ba.infn.it).\"\n\n\nThe Fermi-LAT is a pair conversion telescope designed to cover\nthe energy band from 20 MeV to greater than 300 GeV.\nIt is the product of an international collaboration between\nNASA and DOE in the U.S. and many scientific institutions\nacross France, Italy, Japan and Sweden.",
  "circularId": 25020,
  "createdOn": 1562513738000,
  "email": "elisabetta.bissaldi@ba.infn.it",
  "subject": "LIGO/Virgo S190701ah: No counterpart candidates in Fermi-LAT observations",
  "submitter": "Elisabetta Bissaldi at INFN,Bari  <elisabetta.bissaldi@ba.infn.it>",
  "eventId": "LIGO/Virgo S190701ah"
}