TITLE: GCN CIRCULAR NUMBER: 26745 SUBJECT: LIGO/Virgo S200114f: No counterpart candidates in Fermi-LAT observations DATE: 20/01/14 11:02:00 GMT FROM: Lorenzo Scotton at CNRS/IN2P3/LUPM L. Scotton (CNRS/IN2P3/LUPM), M. Crnogorcevic (Univ. of Maryland & NASA/GSFC), M. Axelsson (KTH & Stockholm Univ.) and F. Longo (University and INFN, Trieste) report on behalf of the Fermi-LAT Collaboration: We have searched data collected by the Fermi Large Area Telescope (LAT) on Jan 14, 2020,��for possible high-energy (E > 100 MeV) gamma-ray emission in��spatial/temporal��coincidence with the LIGO/Virgo trigger S200114f (GCN 26734). We define "instantaneous coverage" as the integral over the region of the LIGO��probability map that is within the LAT field of view at a given time, and��"cumulative��coverage" as the integral of the instantaneous coverage over time.��Fermi-LAT had��an instantaneous coverage of ~87% of the LIGO probability at the��time of the trigger��(T0 = 2020-01-1402:08:18.230UTC), and reached 100%��cumulative coverage��after ~4.2 ks. We performed a search for a transient counterpart within the observed region of the 90% contour of��LIGO map in a fixed time window from T0 to T0 + 10 ks.��No significant new sources��are found. We also performed a search which adapted the time interval of the analysis to the��exposure of each region of the sky, and no additional excesses were found. Energy flux upper bounds for the fixed time interval��between 100 MeV and 1 GeV��for this search vary��between 2e-10 and 2e-08 [erg/cm^2/s]. The Fermi-LAT point of contact for this event is Milena Crnogorcevic (mcrnogor@astro.umd.edu). The Fermi-LAT is a pair conversion telescope designed to cover��the energy band��from 20 MeV to greater than 300 GeV.��It is the product of an international collaboration between��NASA and DOE in the U.S. and many scientific institutions��across France,��Italy, Japan and Sweden.