{
  "circularId": 43369,
  "subject": "Swift trigger 1436759 is not an astrophysical event",
  "createdOn": 1768123351993,
  "body": "R. Brivio (INAF-OAB), A. Mei (INAF-OAB), K. L. Page (U Leicester),\nT. M. Parsotan (GSFC), C. Salvaggio (INAF-OAB),\nB. Sbarufatti (INAF-OAB) and M. H. Siegel (PSU) report on behalf of\nthe Neil Gehrels Swift Observatory Team:\n\nThe downlinked data showed no obvious light curve structure, and the lack of the scaled map at the time prevented full verification of the low image significance of the event in the BAT data.\n\nThe XRT began observing the field at 09:03:15.2 UT, 112.0 seconds after\nthe BAT trigger. No source was detected in 930 s of promptly downlinked\ndata.\n\nUVOT took a finding chart exposure of 250 seconds with the U filter starting\n172 seconds after the BAT trigger. No credible afterglow candidate has been\nfound in the initial data products. The 2.7'x2.7' sub-image covers 25% of the\nBAT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The\n8'x8' region for the list of sources generated on-board covers 100% of the BAT\nerror circle. The list of sources is typically complete to about 18.0 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.111.\n\n",
  "submittedHow": "email",
  "bibcode": "2026GCN.43369....1B",
  "submitter": "K.L. Page at U Leicester <klp5@leicester.ac.uk>"
}