{
  "bibcode": "2016GCN.19967....1P",
  "body": "K. L. Page (U Leicester), A. Y. Lien (GSFC/UMBC),\nF. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU)\nreport on behalf of the Swift Team:\n\nAt 01:05:16 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 161001A (trigger=714404).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 71.913, -57.283 which is \n   RA(J2000) = 04h 47m 39s\n   Dec(J2000) = -57d 16' 57\"\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 3 sec.  The peak count rate\nwas ~11000 counts/sec (15-350 keV), at ~1 sec after the trigger. \n\nThe XRT began observing the field at 01:06:21.5 UT, 65.0 seconds after\nthe BAT trigger. Using promptly downlinked data we find an uncatalogued\nX-ray source located at RA, Dec 71.91848, -57.26127 which is equivalent\nto:\n   RA(J2000)  = 04h 47m 40.44s\n   Dec(J2000) = -57d 15' 40.6\"\nwith an uncertainty of 3.9 arcseconds (radius, 90% containment). This\nlocation is 78 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. No\nspectrum from the promptly downlinked event data is yet available to\ndetermine the column density. \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 68 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\nXRT 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\n0.01. \n\nBurst Advocate for this burst is K. L. Page (klp5 AT leicester.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": 19967,
  "createdOn": 1475284539000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 161001A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 161001A"
}