{
  "bibcode": "2020GCN.26654....1L",
  "body": "F. Longo (University and INFN, Trieste), D. Kocevski (NASA/MSFC), M.\nAxelsson (KTH & Stockholm Univ.)\nand N. Omodei (Stanford Univ.) report on behalf of the Fermi-LAT Collaboration:\n\nWe have searched data collected by the Fermi Large Area Telescope (LAT) on\nJanuary 5th, 2020, for possible high-energy (E > 100 MeV) gamma-ray emission in\nspatial/temporal coincidence with the LIGO/Virgo sub threshold trigger\nS200105ae\n(GCN 26640).\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,\nand \"cumulative\ncoverage\" as the integral of the instantaneous coverage over time. Fermi-LAT had\nan instantaneous coverage of ~40% of the LIGO probability at the time\nof the trigger\n(T0 =2020-01-05 16:24:26 UTC), and reached ~75% cumulative coverage after about\n5 ks. The remaining area was not observed within 10 ks following the\ntrigger time of\nthe event.\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.\nOne significant excess (with TS>25) was found at R.A., Dec. = 215.6,\n32.3, but it is likely\nassociated with the known and currently active source OQ 334 (lies\nwithin the 90%\nuncertainty region).\n\nWe also performed a search which adapted the time interval of the\nanalysis 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 1.1e-10 and 3.5e-07 [erg/cm^2/s].\n\nThe Fermi-LAT point of contact for this event is\nF.Longo (francesco.longo@ts.infn.it).\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": 26654,
  "createdOn": 1578395510000,
  "email": "franzlongo1969@gmail.com",
  "subject": "LIGO/Virgo 200105ae: No counterpart candidates in Fermi-LAT observations",
  "submitter": "Francesco Longo at U of Trieste,INFN Trieste  <franzlongo1969@gmail.com>"
}