{
  "bibcode": "2025GCN.42656....1M",
  "body": "A. Mei (INAF-OAB), J. J. DeLaunay (PSU), M. Ferro (INAF-OAB),\nR. Gupta (NASA GSFC) and M. H. Siegel (PSU) report on behalf of the\nNeil Gehrels Swift Observatory Team:\n\nAt 21:28:56 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated a possible GRB 251112A (trigger=1413695).  Swift slewed immediately to the burst.\nThe BAT on-board calculated location is \nRA, Dec 274.019, +24.226 which is \n   RA(J2000) = 18h 16m 05s\n   Dec(J2000) = 24d 13' 32\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a complex\nstructure with a duration of about 60 sec.  The peak count rate\nwas ~600 counts/sec (15-350 keV), at ~25 sec after the trigger.\n\nThe XRT began observing the field at 21:30:22.7 UT, 86.9 seconds after\nthe BAT trigger. No source was detected in 782 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 91 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\n0.161.\n\nDue to no credible afterglow candidate in the initial XRT and UVOT\ndata, we for now call this a possible GRB while we wait for\nadditional data for further inspection.\n\nBurst Advocate for this burst is A. Mei (alessio.mei AT inaf.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/)\n\n",
  "submittedHow": "email",
  "subject": "Swift Trigger 1413695: a possible GRB 251112A",
  "submitter": "James DeLaunay at PSU <jjd330@psu.edu>",
  "createdOn": 1762985065232,
  "circularId": 42656,
  "eventId": "GRB 251112A"
}