{
  "bibcode": "2017GCN.20718....1D",
  "body": "V. D'Elia (ASDC), A. Cholden-Brown (PSU), A. D'Ai (INAF-IASFPA),\nA. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. Sakamoto (AGU) and\nB. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:\n\nAt 02:24:31 UT, the Swift Burst Alert Telescope (BAT) triggered \non increasing count rate due to the approach to the SAA and\nproduced an image with a marginal-significance peak (trigger=739517). \nSwift slewed to the location after a brief delay due to an observing \nconstraint.  The BAT on-board calculated location is \nRA, Dec 230.670, -55.739 which is \n   RA(J2000) = 15h 22m 41s\n   Dec(J2000) = -55d 44' 20\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows the increasing\ncount rate due to approaching the SAA, but no obvious peak at the\ntrigger time. \n\nThe XRT began observing the field at 02:39:06 UT, 875 seconds after\nthe BAT trigger. No source was detected in 639 s of promptly downlinked\ndata. \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 1464 seconds after the BAT trigger, once Swift had left the SAA. \nNo credible afterglow candidate has been found in the initial data products. \n\nDue to the lack of a clear peak in the BAT lightcurve, the\nmarginal (6.5 sigma) BAT image peak, and the lack of an\nXRT counterpart, we believe that this event was due to particle\nbackground near the SAA and is not an astrophysical event. \n\nFurther analysis will require the full downlinked dataset. \n\nBurst Advocate for this burst is V. D'Elia (delia AT asdc.asi.it). \nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/too.html.)",
  "circularId": 20718,
  "createdOn": 1487733001000,
  "email": "palmer@lanl.gov",
  "subject": "Swift Trigger 739517 is probably not a GRB",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>"
}