{
  "bibcode": "2014GCN.16998....1G",
  "body": "B.P. Gompertz (U Leicester), J. R. Cummings (NASA/UMBC),\nV. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC),\nH. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester),\nD. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and\nM. H. Siegel (PSU) report on behalf of the Swift Team:\n\nAt 14:56:45 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 141031B (trigger=617149).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 356.932, +41.365 which is \n   RA(J2000) = 23h 47m 44s\n   Dec(J2000) = +41d 21' 56\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a single-peaked\nstructure with a duration of about 20 sec.  The peak count rate\nwas ~500 counts/sec (15-350 keV), at ~5 sec after the trigger. \n\nThe XRT began observing the field at 14:58:42.5 UT, 117.5 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source with an enhanced position: RA, Dec 356.9056, 41.3519 which\nis equivalent to:\n   RA(J2000)  = 23h 47m 37.33s\n   Dec(J2000) = +41d 21' 07.0\"\nwith an uncertainty of 2.6 arcseconds (radius, 90% containment). This\nlocation is 85 arcseconds from the BAT onboard position, within the BAT\nerror circle. This position may be improved as more data are received;\nthe latest position is available at http://www.swift.ac.uk/sper.  We\ncannot determine whether the source is fading at the present time. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 1.22\nx 10^21 cm^-2 (Willingale et al. 2013). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 119 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 100% of\nthe XRT 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\n0.15. \n\nBurst Advocate for this burst is B.P. Gompertz (bpg6 AT le.ac.uk). \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": 16998,
  "createdOn": 1414768205000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 141031B: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 141031B"
}