{
  "bibcode": "2019GCN.26205....1V",
  "body": "P. Veres (UAH) reports on behalf of the Fermi-GBM Team and the\nGBM-LIGO/Virgo group:\n\nFor S191109d and using the initial BAYESTAR skymap, Fermi-GBM was observing\n87.2% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of S191109d\n(GCN 26202). An automated, blind search for short gamma-ray bursts below\nthe onboard triggering threshold in Fermi-GBM also identified no\ncounterpart candidates. The GBM targeted search, the most sensitive,\ncoherent search for GRB-like signals, was run from +/-30 s around merger\ntime, and also identified no counterpart candidates.\n\nPart of the LVC localization region is behind the Earth for Fermi, located\nat RA= 320.9, Dec= 12.1 with a radius of 67.5 degrees. We therefore set\nupper limits on impulsive gamma-ray emission for the LVC localization\nregion visible to GBM at merger time. Using the representative soft,\nnormal, and hard GRB-like templates described in arXiv:1612.02395, we set\nthe following 3 sigma flux upper limits over 10-1000 keV, weighted by GW\nlocalization probability (in units of 10^-7 erg/s/cm^2):\n\nTimescale  soft     normal   hard\n--------------------------------------\n0.128 s:   6.3      9.5      23\n1.024 s:   1.5      2.3      5.5\n8.192 s:   0.50     0.76     1.4\n\nAssuming the median luminosity distance of 1810 Mpc from the GW detection,\nwe estimate the following intrinsic luminosity upper limits over the 1\nkeV-10 MeV energy range (in units of 10^49 erg/s):\n\nTimescale  Soft     Normal   Hard\n------------------------------------\n0.128s:    38       52       210\n1.024s:    9.2      13       50\n8.192s:    3.1      4.1      13",
  "circularId": 26205,
  "createdOn": 1573278712000,
  "email": "veresp@gmail.com",
  "subject": "LIGO/Virgo S191109d: Upper limits from Fermi-GBM Observations",
  "submitter": "Peter Veres at UAH  <veresp@gmail.com>",
  "eventId": "LIGO/Virgo S191109d"
}