{
  "bibcode": "2019GCN.24605....1P",
  "body": "S. Poolakkil (UAH) and R. Hamburg (UAH) report on behalf of the\nFermi-GBM Team and the GBM-LIGO/Virgo group:\n\nFor S190519bj, and using the initial BAYESTAR skymap, Fermi-GBM was\nobserving 32.0% 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 S190519bj (GCN 24598). 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\nPart of the LVC localization region is behind the Earth for Fermi,\nlocated at RA = 53.1 and Dec = 15.4 with a radius of 67.5 degrees.\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, weighted by the remaining visible GW localization probability\n(in units of erg/s/cm^2):\n\nTimescale  soft     norm     hard\n--------------------------------------\n0.128 s:   1.3e-07  2.1e-07  4.6e-07\n1.024 s:   3.9e-08  6.2e-08  1.4e-07\n8.192 s:   1.4e-08  1.6e-08  3.8e-08\n\nAssuming the median luminosity distance of ~3154 Mpc from the GW detection,\nwe estimate intrinsic luminosity upper limits of (2.6-24.3)E49 erg/s for the\nsoft template, (2.5-34.0)E49 erg/s for the normal template, and\n(1.0-12.6)E50 erg/s for the hard template over the 1 keV-10 MeV energy\nrange.",
  "circularId": 24605,
  "createdOn": 1558296357000,
  "email": "sp0076@uah.edu",
  "subject": "LIGO/Virgo S190519bj: Fermi GBM Observations",
  "submitter": "Suraj Poolakkil at UAH  <sp0076@uah.edu>",
  "eventId": "LIGO/Virgo S190519bj"
}