{
  "bibcode": "2016GCN.20008....1D",
  "body": "V. D'Elia (ASDC), L. M. Z. Hagen (PSU), J. A. Kennea (PSU),\nA. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC),\nD. M. Palmer (LANL), T. Sakamoto (AGU) and\nB. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:\n\nAt 21:25:43 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 161007A (trigger=716127).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 103.390, +23.289 which is \n   RA(J2000) = 06h 53m 34s\n   Dec(J2000) = +23d 17' 20\"\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 ~30 sec after the trigger. \n\nThe XRT began observing the field at 21:27:47.8 UT, 124.9 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source located at RA, Dec 103.40706, 23.30639 which\nis equivalent to:\n   RA(J2000)  = 06h 53m 37.69s\n   Dec(J2000) = +23d 18' 23.0\"\nwith an uncertainty of 4.3 arcseconds (radius, 90% containment). This\nlocation is 84 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\nThe initial flux in the 2.5 s image was 1.56e-09 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 133 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\n0.12. \n\nBurst Advocate for this burst is V. D'Elia (delia AT asdc.asi.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/too.html.)",
  "circularId": 20008,
  "createdOn": 1475876454000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 161007A: Swift detection of a burst",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 161007A"
}