{
  "bibcode": "2011GCN.12632....1H",
  "body": "E. A. Hoversten (PSU), P. A. Evans (U Leicester),\nC. Guidorzi (U Ferrara), A. Y. Lien (NASA/GSFC/ORAU),\nC. Pagani (U Leicester), K. L. Page (U Leicester),\nD. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU),\nM. C. Stroh (PSU), G. Tagliaferri (INAF-OAB) and B.-B. Zhang (PSU)\nreport on behalf of the Swift Team:\n\nAt 07:12:08 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 111209A (trigger=509336).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 14.360, -46.788 which is \n   RA(J2000) = 00h 57m 26s\n   Dec(J2000) = -46d 47' 17\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  After the original 320 second long image \ntrigger, the source caused a second trigger (#509337) over the\n64 second time interval starting at T+424s, at much higher intensity. \n\nThe XRT began observing the field at 07:19:07.2 UT, 418.9 seconds after\nthe BAT trigger. XRT found a bright, uncatalogued X-ray source located\nat RA, Dec 14.3462, -46.8005 which is equivalent to:\n   RA(J2000)  = 00h 57m 23.08s\n   Dec(J2000) = -46d 48' 01.7\"\nwith an uncertainty of 4.7 arcseconds (radius, 90% containment). This\nlocation is 56 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\nThe initial flux in the 2.5 s image was 1.20e-08 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 150 seconds with the White\nfilter  starting 427 seconds after the BAT trigger.  There is a\ncandidate afterglow in  the rapidly available 2.7'x2.7' sub-image at\napproximately the same position as the XRT source with a magnitude of\n18.1.  No correction has been made  for the expected extinction\ncorresponding to E(B-V) of 0.02. \n\nBurst Advocate for this burst is E. A. Hoversten (hoversten AT astro.psu.edu). \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": 12632,
  "createdOn": 1323416560000,
  "email": "palmer@lanl.gov",
  "subject": "GRB 111209A: Swift detection of a long burst with an optical counterpart",
  "submitter": "David Palmer at LANL  <palmer@lanl.gov>",
  "eventId": "GRB 111209A"
}