{
  "bibcode": "2020GCN.27209....1G",
  "body": "A. Goldstein (USRA) reports on behalf of the Fermi-GBM Team and the\nGBM-LIGO/Virgo group\n\nFor S200225q and using the latest BAYESTAR skymap, Fermi-GBM was observing\n88.6% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the\nLIGO/Virgo detection of GW trigger S200225q (GCN Circ. 27193). An\nautomated, blind search for short gamma-ray bursts below the onboard\ntriggering threshold in Fermi-GBM also identified no counterpart\ncandidates. The GBM targeted search, the most sensitive, coherent search\nfor GRB-like signals, was run from +/-30 s around merger time, and also\nidentified no counterpart candidates.\n\nPart of the LVC localization region is behind the Earth for Fermi, located\nat RA=224.3, Dec=24.7 with a radius of 67.2 degrees. We therefore set upper\nlimits on impulsive gamma-ray emission for the LVC localization region\nvisible to Fermi at merger time. Using the representative soft, normal, and\nhard GRB-like templates described in arXiv:1612.02395, we set the following\n3 sigma flux upper limits over 10-1000 keV, weighted by GW localization\nprobability (in units of 10^-7 erg/s/cm^2):\n\nTimescale  Soft     Normal   Hard\n---------------------------------\n0.128 s:   10.      13.      23.\n1.024 s:   3.7      3.8      6.6\n8.192 s:   0.9      1.0      2.0\n\nAssuming the median luminosity distance of 1234 Mpc from the GW detection,\nwe estimate the following intrinsic luminosity upper limits over the 1\nkeV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale  Soft     Normal   Hard\n------------------------------------\n0.128s:    2.8      3.3      9.8\n1.024s:    1.0      1.0      2.8\n8.192s:    0.2      0.2      0.8",
  "circularId": 27209,
  "createdOn": 1582649133000,
  "email": "adam.michael.goldstein@gmail.com",
  "subject": "LIGO/Virgo S200225q: Upper limits from Fermi-GBM Observations",
  "submitter": "Adam Goldstein at Fermi-GBM, USRA  <adam.michael.goldstein@gmail.com>",
  "eventId": "LIGO/Virgo S200225q"
}