{
  "bibcode": "2017GCN.20688....1B",
  "body": "S. D. Barthelmy (GSFC), S. B. Cenko (GSFC),\nF. E. Marshall (NASA/GSFC), B. Mingo (U Leicester),\nK. L. Page (U Leicester) and E. Troja (NASA/GSFC/UMCP) report on\nbehalf of the Swift Team:\n\nAt 19:21:57 UT, the Swift Burst Alert Telescope (BAT) triggered on noise\nnear NGC 4096 (trigger=738728).  The image significance was 5.86 sigma. \nSwift slewed immediately to the location.  The BAT on-board calculated location\nis RA, Dec 181.474, +47.650, which is \n   RA(J2000)  =  12h 05m 54s\n   Dec(J2000) = +47d 38' 60\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  As is typical for an image trigger\nthere is nothing significant in the real-time light curve. \n\nThe XRT began observing the field at 19:24:12.9 UT, 135.5 seconds after\nthe BAT trigger. No source was detected in 411 s of promptly downlinked\ndata. \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 139 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.",
  "circularId": 20688,
  "createdOn": 1487273975000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "Trigger 738728: Swift triggered on noise near NGC 4096",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>"
}