{
  "bibcode": "2019GCN.24248....1F",
  "body": "C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team and the\nGBM-LIGO/Virgo group:\n\nFor S190426c, and using the updated BAYESTAR skymap, Fermi-GBM was\nobserving 100% 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 S190426c (GCN 24237). An automated,\nblind search for short gamma-ray bursts below the onboard triggering\nthreshold in Fermi-GBM also identified no counterpart candidates. The GBM\ntargeted search, the most sensitive, coherent search for GRB-like signals,\nwas run from +/-30 s around merger time, and also identified no counterpart\ncandidates.\n\nWe therefore set upper limits on impulsive gamma-ray emission.  Using the\nrepresentative soft, normal, and hard GRB-like spectral templates described\nin arXiv:1612.02395, we set the following 3 sigma flux upper limits over\n10-1000 keV (in units of 10^-7 erg/s/cm^2):\n\nTimescale  Soft     Normal   Hard\n------------------------------------\n0.1 s:     3.9-7.0  8.3-12.  26.-30.\n1.0 s:     1.2-2.2  2.6-3.7  7.7-8.8\n10  s:     0.4-0.7  0.8-1.1  2.4-2.7\n\nAssuming the mean luminosity distance of ~375 Mpc from the GW detection, we\nestimate intrinsic luminosity upper limits of (0.09-1.6)E49 erg/s for the\nsoft template, (0.2-2.6)E49 erg/s\nfor the normal template, and (0.9-10.6)E49 erg/s for the hard template over\nthe 1 keV-10 MeV energy range.",
  "circularId": 24248,
  "createdOn": 1556311831000,
  "email": "adam.michael.goldstein@gmail.com",
  "subject": "LIGO/Virgo S190426c: Fermi GBM Observations",
  "submitter": "Adam Goldstein at Fermi-GBM, USRA  <adam.michael.goldstein@gmail.com>",
  "eventId": "LIGO/Virgo S190426c"
}