{
  "bibcode": "2014GCN.16095....1B",
  "body": "W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU),\nS. B. Cenko (GSFC), V. D'Elia (ASDC), J. A. Kennea (PSU),\nF. E. Marshall (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU),\nM. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the\nSwift Team:\n\nAt 17:20:28 UT, the Swift Burst Alert Telescope (BAT) triggered and found an image\npeak in the vicinity of NGC 4457 (trigger=595345).  Swift slewed immediately to the \nBAT position. The BAT on-board calculated location is \nRA, Dec 187.132, +3.480 which is \n   RA(J2000) = 12h 28m 32s\n   Dec(J2000) = +03d 28' 47\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As is usual for an image trigger, nothing of note\nis found in the BAT light curve. \n\nThe XRT began observing the field at 17:22:21.6 UT, 113.5 seconds after\nthe BAT trigger. No source was detected in 1.2 ks of promptly\ndownlinked data. \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 117 seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 25% of\nthe BAT error circle. The typical 3-sigma upper limit has been about 19.6 mag. \nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nBAT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.02. \n\nDue to the low significance of the BAT peak (6.51 sigma) in an image trigger,\nthe lack of a corresponding rate increase, the large distance between \nthe image peak and the potential host galaxy (0.149 degrees), and the lack of \nan XRT detection, we believe that this trigger was a noise peak and not \nan astrophysical source.",
  "circularId": 16095,
  "createdOn": 1397152039000,
  "email": "palmer@lanl.gov",
  "subject": "Swift Trigger 595345 is not an astrophysical source",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}