{
  "bibcode": "2010GCN.10775....1S",
  "body": "M. Stamatikos (OSU/NASA/GSFC), S. D. Barthelmy (GSFC),\nA. P. Beardmore (U Leicester), M. M. Chester (PSU),\nP. A. Evans (U Leicester), J. M. Gelbord (PSU), J. A. Kennea (PSU),\nC. Pagani (U Leicester), J. L. Racusin (NASA/GSFC) and L. Vetere (PSU)\nreport on behalf of the Swift Team:\n\nSwift began a target of opportunity observation of GRB 100518A on May\n18, 2010 at 14:10 UT, approximately 2.6 hours after the burst was\ndetected by INTEGRAL. Swift data for these observations utilize Target\nID 20138. \n\nThe XRT began observing the field at 14:12:42.5 UT, 9.5 ks after the\nINTEGRAL trigger. Using promptly downlinked data we find an\nuncatalogued X-ray source located at RA, Dec 304.78875, -24.55459 which\nis equivalent to:\n   RA(J2000)  = 20h 19m 9.30s\n   Dec(J2000) = -24d 33' 16.5\"\nwith an uncertainty of 4.1 arcseconds (radius, 90% containment). This\nlocation is 42 arcseconds from the INTEGRAL position, within the\nINTEGRAL error circle. This position may be improved as more data are\nreceived; the latest position is available at\nhttp://www.swift.ac.uk/sper.  We cannot determine whether the source is\nfading at the present time. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of\n6.4e+20 cm^-2 (Kalberla et al. 2005). \n\nUVOT took a finding chart exposure of 150 seconds with the White  \nfilter starting 9551 seconds after the INTEGRAL trigger. No credible  \nafterglow candidate  has been found in the initial data products. The \n 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical \n3-sigma upper limit has been about  19.6  mag. The 8'x8' region for \nthe list of sources generated on-board is typically  complete to about\n18  mag.  No correction has been made for the  expected extinction\ncorresponding  to  E(B-V) of 0.07. \n\nBurst Advocate for this burst is M. Stamatikos (Michael.Stamatikos-1 AT nasa.gov). \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": 10775,
  "createdOn": 1274193335000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 100518A"
}