{
  "bibcode": "2014GCN.16135....1B",
  "body": "S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), C. Gronwall (PSU),\nS. T. Holland (STScI), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL),\nF. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA),\nD. M. Palmer (LANL) and T. Sakamoto (AGU) report on behalf of the\nSwift Team:\n\nAt 00:37:24 UT, the Swift Burst Alert Telescope (BAT) triggered \non something which is not likely astrophysical (trigger=596641). \nSwift slewed immediately to the location.  The BAT on-board calculated location\nis RA, Dec 336.363, +3.636, which is \n   RA(J2000)  =  22h 25m 27s\n   Dec(J2000) = +03d 38' 10\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As per usual for an image trigger, the TDRSS\nreal-time light curve does not show anything significant. \n\nThe XRT began observing the field at 00:39:53.6 UT, 149.5 seconds after\nthe BAT trigger. No source was detected in 862 s of promptly downlinked\ndata. We are waiting for the full dataset to detect and localise the\nXRT counterpart. \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 153 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\n0.10. \n\nDue to the lack of a BAT rate trigger, the marginal detection (7.0 sigma)\nin the BAT image, and the lack of a source in the XRT and UVOT\ndata, we doubt that this is an astrophysical source. \nFurther analysis will require the full ground downlinked data.",
  "circularId": 16135,
  "createdOn": 1398042479000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "Swift Trigger 596641 is not a GRB",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>"
}