{
  "bibcode": "2015GCN.18398....1K",
  "body": "D. Kocevski (NASA/GSFC/ORAU), S. D. Barthelmy (GSFC),\nP. A. Evans (U Leicester), K. L. Page (U Leicester) and\nB. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team:\n\nAt 09:55:01 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 151006A (trigger=657750).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 147.451, +70.509, which is \n   RA(J2000)  =  09h 49m 48s\n   Dec(J2000) = +70d 30' 31\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows a single FRED-like peak\nstructure with a duration of about 40 sec.  The peak count rate\nwas ~4000 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nThe XRT began observing the field at 09:55:50.4 UT, 48.6 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 147.4256, 70.5036 which is equivalent to:\n   RA(J2000)  = +09h 49m 42.14s\n   Dec(J2000) = +70d 30' 13.0\"\nwith an uncertainty of 4.8 arcseconds (radius, 90% containment). This\nlocation is 36 arcseconds from the BAT onboard position, within the BAT\nerror circle. No event data are yet available to determine the column\ndensity using X-ray spectroscopy. \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 58 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\n0.24. \n\nBurst Advocate for this burst is D. Kocevski (dankocevski AT gmail.com). \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": 18398,
  "createdOn": 1444125937000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "GRB 151006A: Swift detection of a burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 151006A"
}