{
  "bibcode": "2011GCN.12088....1P",
  "body": "K. L. Page (U Leicester), S. D. Barthelmy (GSFC),\nA. P. Beardmore (U Leicester), J. R. Cummings (NASA/UMBC),\nV. D'Elia (ASDC), S. T. Holland (CRESST/USRA/GSFC),\nF. E. Marshall (NASA/GSFC), C. Pagani (U Leicester),\nD. M. Palmer (LANL), P. Romano (INAF-IASFPA), C. J. Saxton (UCL-MSSL),\nM. H. Siegel (PSU), M. C. Stroh (PSU) and T. N. Ukwatta (MSU) report\non behalf of the Swift Team:\n\nAt 21:08:28 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 110625A (trigger=456073).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 286.750, +6.753, which is \n   RA(J2000)  =  19h 07m 00s\n   Dec(J2000) = +06d 45' 10\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows several bright peaks\nwith a total duration of about 60 sec.  The peak count rate\nwas ~20,000 counts/sec (15-350 keV), at ~13 sec after the trigger. \n\nThe XRT began observing the field at 21:10:48.8 UT, 140.3 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nfading, uncatalogued X-ray source located at RA, Dec 286.73189, 6.75386\nwhich is equivalent to:\n   RA(J2000)  = 19h 06m 55.65s\n   Dec(J2000) = +06d 45' 13.9\"\nwith an uncertainty of 3.8 arcseconds (radius, 90% containment). This\nlocation is 64 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. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata does not constrain the column density. \n\nThe initial flux in the 2.5 s image was 1.72e-09 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 250 seconds with the U filter starting\n205 seconds after the BAT trigger. No credible afterglow candidate has been\nfound in the initial data products. The 2.7'x2.7' sub-image covers 100% of the\nXRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The\n8'x8' region for the list of sources generated on-board covers 100% of the XRT\nerror circle. The list of sources is typically complete to about 18.0 mag. No\ncorrection has been made for the large, but uncertain extinction expected. \n\nBurst Advocate for this burst is K. L. Page (kpa AT star.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": 12088,
  "createdOn": 1309037119000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "GRB 110625A: Swift detection of a burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 110625A"
}