{
  "bibcode": "2019GCN.26224....1W",
  "body": "C.A. Wilson-Hodge (NASA/MSFC) reports on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo group\r\n\r\nFor S191110af and using the initial cWB.fits.gz skymap, Fermi-GBM was observing 90.5% of the localization probability at event time.\r\n\r\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo detection of GW trigger S191110af (GCN 26222). An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM also identified no counterpart candidates. The GBM targeted search, the most sensitive, coherent search for GRB-like signals, was run from +/-30 s around merger time, and also identified no counterpart candidates.\r\n\r\nPart of the LVC localization region is behind the Earth for Fermi, located at RA=315.2, Dec=9.0 with a radius of 67.5 degrees. We therefore set upper limits on impulsive gamma-ray emission for the LVC localization region visible to Fermi at merger time. Using the representative soft, normal, and hard GRB-like templates described in arXiv:1612.02395, we set the following 3 sigma flux upper limits over 10-1000 keV, weighted by GW localization probability (in units of 10^-7 erg/s/cm^2):\r\n\r\nTimescale  soft     norm     hard\r\n--------------------------------------\r\n0.128 s:   7.4      12.      20.\r\n1.024 s:   2.2      3.4      5.6\r\n8.192 s:   0.8      1.1      2.3",
  "circularId": 26224,
  "createdOn": 1573448235000,
  "email": "colleen.wilson@nasa.gov",
  "subject": "LIGO/Virgo S191110af: Upper limits from Fermi-GBM Observations",
  "submitter": "Colleen A. Wilson at NASA/MSFC/NSSTC  <colleen.wilson@nasa.gov>",
  "eventId": "LIGO/Virgo S191110af"
}