{
  "bibcode": "2020GCN.27207....1S",
  "body": "L. Scotton (CNRS/IN2P3/LUPM), M. Crnogorcevic (Univ. of Maryland & NASA/GSFC), N. Di Lalla (Stanford University), M. Axelsson (KTH & Stockholm Univ), E. Bissaldi (Politecnico & INFN Bari), D. Kocevski (NASA/MSFC), N. Omodei (Stanford Univ.) and F. Longo (University and INFN, Trieste) report on behalf of the Fermi-LAT Collaboration:\n\nWe have searched data collected by the Fermi Large Area Telescope (LAT) on \nFebruary 25, 2020, for possible high-energy (E > 100 MeV) gamma-ray emission in \nspatial/temporal coincidence with the LIGO/Virgo trigger S200225q (GCN 27193).\n\nWe define \"instantaneous coverage\" as the integral over the region of the LIGO\nprobability map that is within the LAT field of view at a given time, and \"cumulative\ncoverage\" as the integral of the instantaneous coverage over time. Fermi-LAT had\nan instantaneous coverage of ~3% of the LIGO probability at the time of the trigger\n(T0 = 2020-02-25 06:04:21.397 UTC), and reached 100% cumulative coverage \nafter ~5.3 ks.\n\nWe performed a search for a transient counterpart within the observed region of \nthe 90% contour of LIGO map in a fixed time window from T0 to T0 + 10 ks. \nNo significant new sources are found.\n \nWe also performed a search which adapted the time interval of the analysis to the\nexposure of each region of the sky, and no additional excesses were found.\n\nEnergy flux upper bounds for the fixed time interval between 100 MeV and 1 GeV\nfor this search vary between 1.8e-10 and 8.1e-7 [erg/cm^2/s].\n  \nThe Fermi-LAT point of contact for this event is \nLorenzo Scotton (lorenzo.scotton@lupm.in2p3.fr).\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": 27207,
  "createdOn": 1582648000000,
  "email": "milenaGCN@gmail.com",
  "subject": "LIGO/Virgo S200225q: No counterpart candidates in Fermi-LAT observations",
  "submitter": "Milena Crnogorcevic at U.of Maryland/NASA-GSFC  <milenaGCN@gmail.com>",
  "eventId": "LIGO/Virgo S200225q"
}