{
  "bibcode": "2016GCN.19714....1K",
  "body": "J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) and\nT. G. R. Roegiers (PSU) report on behalf of the Swift Team:\n\nAt 01:02:07 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated a possible source (trigger=704444).  Swift slewed immediately \nto the location. \nThe BAT on-board calculated location is \nRA, Dec 193.774, +13.145 which is \n   RA(J2000) = 12h 55m 06s\n   Dec(J2000) = +13d 08' 42\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As is usual with an image trigger, the available\nBAT light curve shows no significant structure. \n\nThe XRT began observing the field at 01:04:17.9 UT, 130.5 seconds after\nthe BAT trigger. No source was detected in 213 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 136 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\n0.04. \n\nThis is a low significance (5.96 sigma) peak in an image produced \nin the absence of a rate increase.  Swift slews to such marginal\ndetections only when they are sufficiently near a source in the\nonboard catalog to allow XRT and UVOT to confirm or refute the\npossible activity. \n\nIn this case, the lack of XRT detection strongly suggests \nthat this was merely a noise fluctuation in the image. \n\nWe do not believe that this was an astrophysical event.",
  "circularId": 19714,
  "createdOn": 1468545616000,
  "email": "palmer@lanl.gov",
  "subject": "Swift Trigger 704444 is probably not an astrophysical event.",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}