{
  "circularId": 45753,
  "createdOn": 1790390632781,
  "subject": "Swift Trigger 1513439 is probably not a GRB",
  "body": "V. D'Elia (SSDC & INAF-OAR), R. Gupta (NASA GSFC),\nA. Y. Lien (U Tampa), K. L. Page (U Leicester), D. M. Palmer (LANL),\nB. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nAt 02:16:42 UT, the Swift Burst Alert Telescope (BAT) triggered on a rate\nincrease and located an apparent peak in the image (trigger=1513439).\nSwift slewed immediately to the location.\nThe BAT on-board calculated location is \nRA, Dec = 358.064, +58.474 deg,  which is \n   RA(J2000) = +23h 52m 15s\n   Dec(J2000) = +58d 28' 27\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve does not show any\nsignificant GRB-like behavior over the high and smoothly-varying\nbackground count rates, consistent with Swift's location near the SAA.\n\nThe XRT began observing the field at 02:20:29.3 UT, 227.5 seconds after\nthe BAT trigger. No source was detected in the 2.5-s promptly available\nimage.\n\nDue to the low significance of the image peak (6.5 sigma), the geographical\nlocation of Swift near the fringes of the SAA at the time of the trigger,\nleading to the rate increase, and the lack of an XRT counterpart, we believe\nthat this is probably not due to an astrophysical source.\n\n",
  "submitter": "Jimmy DeLaunay at PSU <jjd330@psu.edu>",
  "submittedHow": "email"
}