{
  "bibcode": "2013GCN.14433....1B",
  "body": "W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU),\nM. M. Chester (PSU), J. R. Cummings (NASA/UMBC),\nN. Gehrels (NASA/GSFC), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL),\nF. E. Marshall (NASA/GSFC), S. R. Oates (UCL-MSSL),\nD. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the\nSwift Team:\n\nAt 21:02:10 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated a peak in the resulting image (trigger=554135).  Swift slewed \nimmediately to the location.  The BAT on-board calculated location is \nRA, Dec 235.706, +58.498 which is \n   RA(J2000) = 15h 42m 49s\n   Dec(J2000) = +58d 29' 51\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve is consistent with\nrandom variation. \n\nThe XRT began observing the field at 21:03:36.4 UT, 86.4 seconds after\nthe BAT trigger. No source was detected in 253 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 89 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\n0.01. \n\nBecause BAT's detection was marginal, and XRT found nothing at\nthe location, we believe that this is probably not a GRB. \nHowever, a final determination of the reality of the source\nwill require the full downlinked dataset.",
  "circularId": 14433,
  "createdOn": 1366579098000,
  "email": "palmer@lanl.gov",
  "subject": "Swift Trigger 554135 is probably not a GRB or transient",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}