{
  "bibcode": "2019GCN.25096....1P",
  "body": "D. M. Palmer (LANL), S. D. Barthelmy (NASA/GSFC),\nA. Y. Lien (GSFC/UMBC), T. Sakamoto (AGU),\nA. A. Breeveld (MSSL-UCL), A. P. Beardmore (U. Leicester),\nD. N. Burrows (PSU), S. Campana (INAF-OAB), S. B. Cenko (NASA/GSFC),\nG. Cusumano (INAF-IASF PA), A. D'Ai (INAF-IASFPA),\nP. D'Avanzo (INAF-OAB), V. D'Elia (ASI-SSDC), S. Emery (UCL-MSSL),\nP. A. Evans (U. Leicester), P. Giommi (ASI), C. Gronwall (PSU),\nD. Hartmann (Clemson U.), J. A. Kennea (PSU), H. A. Krimm (NSF),\nN. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC),\nA. Melandri (INAF-OAB), J. A. Nousek (PSU),\nS. R. Oates (Uni. of Warwick), P. T. O'Brien (U. Leicester),\nJ. P. Osborne (U. Leicester), C. Pagani (U. Leicester),\nK. L. Page (U.Leicester), M. J. Page (UCL-MSSL), M. Perri (ASDC),\nJ. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU),\nM. H. Siegel (PSU), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (PSU),\nE. Troja (NASA/GSFC/UMCP) report on behalf of the Swift team:\n\nWe report the search results in the BAT data within T0 +/- 100 s of the\nLVC event S190718y (LIGO/VIRGO Collaboration GCN Circ. 25087),\nwhere T0 is the LVC trigger time (2019-07-18T14:35:12.067 UTC).\n\nThe center of the BAT FOV at T0 is\nRA = 357.719 deg,\nDEC = -45.287 deg,\nand the ROLL angle is 94.804 deg.\nThe BAT Field of View (>10% partial coding) covers 6.27% of the integrated\nLVC localization probability, and 11.94% of the galaxy convolved\nprobability (Evans et al. 2016).\n\nSwift/BAT was in SAA during this time. Within T0 +/- 100 s, no significant\ndetections are found in the BAT raw light curves with time bins of 64 ms,\n1 s, and 1.6 s. The flux upper limit estimation is unavailable due\nto the rapid increase of background during the SAA.\n\nBAT retains decreased, but significant, sensitivity to rate increases for\ngamma-ray events outside of its FOV. About 23.33% of the integrated LVC\nlocalization probability was outside of the BAT FOV but above the\nEarth's limb from Swift's location, and the corresponding flux upper limits\nfor this region are within roughly an order of magnitude higher than those\nwithin the FOV.\n\nThe results of the BAT analysis are available at\nhttps://swift.gsfc.nasa.gov/results/BATbursts/team_web/S190718y/web/source.html",
  "circularId": 25096,
  "createdOn": 1563496037000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "LIGO/Virgo S190718y: No counterpart candidates in the Swift/BAT Observations",
  "submitter": "Amy Lien at GSFC  <amy.y.lien@nasa.gov>",
  "eventId": "LIGO/Virgo S190718y"
}