{
  "bibcode": "2019GCN.25122....1W",
  "body": "J. Wood (NASA/MSFC) reports on behalf of the Fermi-GBM Team and the GBM-LIGO/Virgo group:\n\nFor the LIGO/Virgo detection of GW trigger S190720a (GCN 25115) and using the initial BAYESTAR skymap, Fermi-GBM was observing 73.2% of the localization probability at event time.\n\nThere was no Fermi-GBM onboard trigger around the event time of S190720a. 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 (in units of 10^-8 erg/s/cm^2):\n\nTimescale ��Soft �� Normal �� Hard\n------------------------------------\n0.128 s: �� 37. �� ��57. �� �� ��110.\n1.024 s: �� 13. �� ��17. �� �� ��40.\n8.192 s: �� 3.2 �� ��4.9 �� �� ��9.5 \n\nAssuming the median luminosity distance of 1071 Mpc (z=0.215) 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------------------------------------\n0.128 s: �� 78.6 �� 110. �� �� 352.\n1.024 s: �� 27.6 �� 32.7 �� �� 128.\n8.192 s: �� 6.80 �� 9.42 �� �� 30.4",
  "circularId": 25122,
  "createdOn": 1563625917000,
  "email": "joshua.r.wood@nasa.gov",
  "subject": "LIGO/Virgo S190720a: Upper limits from Fermi-GBM Observations",
  "submitter": "Joshua Wood at MSFC/Fermi-GBM  <joshua.r.wood@nasa.gov>",
  "eventId": "LIGO/Virgo S190720a"
}