{
  "bibcode": "2019GCN.26461....1W",
  "body": "J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo group\n\nFor S191216ap and using the initial bayestar.fits.gz skymap, Fermi-GBM was observing 99.8% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of the LIGO/Virgo detection of GW trigger S191216ap (GCN 26454). 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.\n\nWe therefore set upper limits on impulsive gamma-ray emission. 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):\n\nTimescale  Soft     Normal   Hard\n------------------------------------\n0.128 s:   5.7      8.5      16.\n1.024 s:   2.1      3.6      5.7\n8.192 s:   0.7      1.0      2.0\n\nAssuming the median luminosity distance of 324 Mpc from the GW detection, we estimate the following intrinsic luminosity upper limits over the 1 keV-10 MeV energy range (in units of 10^48 erg/s):\n\nTimescale  Soft     Normal   Hard\n------------------------------------\n0.128s:    11.      15.      47.\n1.024s:    4.0      6.4      17.\n8.192s:    1.4      1.8      5.9",
  "circularId": 26461,
  "createdOn": 1576549186000,
  "email": "joshua.r.wood@nasa.gov",
  "subject": "LIGO/Virgo S191216ap: Upper limits from Fermi-GBM Observations",
  "submitter": "Joshua Wood at MSFC/Fermi-GBM  <joshua.r.wood@nasa.gov>",
  "eventId": "LIGO/Virgo S191216ap"
}