{
  "bibcode": "2017GCN.21524....1B",
  "body": "S. D. Barthelmy (NASA/GSFC), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), A. 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), P. D'Avanzo (INAF-OAB),\nV. D'Elia(ASDC), S. Emery (UCL-MSSL), P. A. Evans (U. Leicester), \nP. Giommi (ASI), C. Gronwall (PSU), J. A. Kennea (PSU), \nH. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), \nF. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), \nB. Mingo (U. Leicester), J. A. Nousek (PSU), S. R. Oates (Uni. of Warwick), \nP. T. O'Brien (U. Leicester), J. P. Osborne (U. Leicester), \nC. Pagani (U. Leicester), K. L. Page (U.Leicester), M. Perri (ASDC), \nJ. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU),\nM. H. Siegel (PSU), G. Tagliaferri (INAF-OAB), E. Troja (NASA/GSFC/UMCP)\nreport on behalf of the Swift team:\n\nWe report the search results in the BAT data within T0 +/- 100 s of the\nLVC event G298048 (LIGO/VIRGO Collaboration GCN Circ. 21513), \nwhere T0 is the LVC trigger time (2017-08-17T12:41:04.445 UTC).\n\nThe center of the BAT FOV at T0 is\nRA = 36.075 deg,\nDEC = -52.287 deg,\nROLL = 108.515 deg.\nThe BAT Field of View (>10% partial coding) covers 0.0% of the integrated\nLVC localization probability. That is, there is no overlap between the BAT\nfield of view and the LVC probability region at T0.\n\nWithin T0 +/- 100 s, no significant detections (signal-to-noise ratio >~ 5 sigma) \nare found in the BAT raw light curves with time bins of 64 ms, 1 s, and 1.6 s, \nrespectively. Assuming an on-axis (100% coded) short GRB with a typical spectrum in \nthe BAT energy range (i.e., a simple power-law model with a power-law index of -1.32, \nLien & Sakamoto et al. 2016), the 5-sigma upper limit in the 1-s binned light curve \ncorresponds to a flux upper limit (15-350 keV) of ~ 7.82 x 10^-8 erg/s/cm^2.\n\nBAT retains decreased, but significant, sensitivity to rate increases for\ngamma-ray events outside of its FOV. About 0.15% of the integrated LVC\nlocalization probability was outside of the BAT FOV but above the Earth's limb \nfrom Swift's location, and the corresponding flux upper limits for this region \nare within roughly an order of magnitude of those within the FOV.",
  "circularId": 21524,
  "createdOn": 1503005676000,
  "email": "amy.y.lien@nasa.gov",
  "subject": "LIGO/Virgo G298048: Swift/BAT data search",
  "submitter": "Amy Lien at GSFC/Swift  <amy.y.lien@nasa.gov>",
  "eventId": "LIGO/Virgo G298048"
}