{
  "bibcode": "2019GCN.25522....1V",
  "body": "P. Veres (UAH) reports on behalf of the Fermi-GBM Team and the\nGBM-LIGO/Virgo group:\n\nFor S190828j and using the updated bayestar skymap (GCN 25504), Fermi-GBM\nwas observing 83% 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 S190828j (GCN 25497). 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 templates described in\narXiv:1612.02395, we set the following 3 sigma flux upper limits over\n10-1000 keV (in units of erg/s/cm^2):\n\n\nTimescale  Soft     Normal   Hard\n--------------------------------------\n0.128 s:   5.5e-07  7.5e-07  1.7e-06\n1.024 s:   1.8e-07  2.8e-07  6.8e-07\n8.192 s:   7.1e-08  1.3e-07  2.5e-07\n\nAssuming the median luminosity distance of 1800 Mpc (z=0.34) from the GW\ndetection, we estimate the following intrinsic luminosity upper limits over\nthe 1 keV-10 MeV energy range (in units of 10^50 erg/s):\n\nTimescale  Soft          Normal      Hard\n------------------------------------\n0.128 s:     3.4          4.1         16\n1.024 s:     1.1          1.5         6.2\n8.192 s:     0.44         0.71        2.3",
  "circularId": 25522,
  "createdOn": 1567008883000,
  "email": "veresp@gmail.com",
  "subject": "LIGO/Virgo S190828j: Upper limits from Fermi-GBM Observations",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "LIGO/Virgo S190828j"
}