{
  "bibcode": "2011GCN.11754....1S",
  "body": "M. Stamatikos (OSU/NASA/GSFC), S. D. Barthelmy (GSFC),\nW. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester),\nS. Campana (INAF-OAB), P. A. Evans (U Leicester), J. M. Gelbord (PSU),\nC. Guidorzi (U Ferrara), S. T. Holland (CRESST/USRA/GSFC),\nE. A. Hoversten (PSU), J. A. Kennea (PSU),\nH. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL),\nF. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester),\nC. Pagani (U Leicester), K. L. Page (U Leicester),\nD. M. Palmer (LANL), J. L. Racusin (NASA/GSFC),\nE. Sonbas (GSFC/USRA/Adiyaman Univ.), R. L. C. Starling (U Leicester),\nC. A. Swenson (PSU) and E. Troja (NASA/GSFC/ORAU) report on behalf of\nthe Swift Team:\n\nAt 21:25:48 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 110223B (trigger=446677).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 150.276, -68.329 which is \n   RA(J2000) = 10h 01m 06s\n   Dec(J2000) = -68d 19' 44\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a double-peaked\nstructure with a duration of about 5 sec.  The peak count rate\nwas ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger. \n\nThe XRT began observing the field at 21:27:00.0 UT, 72.0 seconds after\nthe BAT trigger. Using promptly downlinked data we find a fading,\nuncatalogued X-ray source with an enhanced position: RA, Dec 150.2339,\n-68.3019 which is equivalent to:\n   RA(J2000)  = 10h 00m 56.15s\n   Dec(J2000) = -68d 18' 06.7\"\nwith an uncertainty of 2.1 arcseconds (radius, 90% containment). This\nlocation is 112 arcseconds from the BAT onboard position, within the\nBAT error circle. This position may be improved as more data are\nreceived; the latest position is available at\nhttp://www.swift.ac.uk/sper. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 1.29\nx 10^21 cm^-2 (Kalberla et al. 2005). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 77 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 none of\nthe XRT error circle. The coverage of the XRT error circle by the 8'x8' region\nfor the list of sources generated on-board is uncertain because the large\nnumber of sources filled the available telemetry. No correction has been made\nfor the expected extinction corresponding to E(B-V) of 0.23. \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": 11754,
  "createdOn": 1298497185000,
  "email": "kennea@astro.psu.edu",
  "subject": "GRB 110223B: Swift detection of a burst",
  "submitter": "Jamie A. Kennea at PSU/Swift-XRT  <kennea@astro.psu.edu>",
  "eventId": "GRB 110223B"
}