{
  "bibcode": "2011GCN.12065....1M",
  "body": "F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC),\nA. P. Beardmore (U Leicester), D. N. Burrows (PSU),\nS. Campana (INAF-OAB), J. R. Cummings (NASA/UMBC), V. D'Elia (ASDC),\nJ. M. Gelbord (PSU), S. T. Holland (CRESST/USRA/GSFC),\nJ. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA),\nC. B. Markwardt (NASA/GSFC), P. T. O\\'Brien (U Leicester),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nA. Rowlinson (U Leicester), T. Sakamoto (NASA/UMBC),\nM. H. Siegel (PSU), C. A. Swenson (PSU), G. Tagliaferri (INAF-OAB),\nE. Troja (NASA/GSFC/ORAU) and T. N. Ukwatta (MSU) report on behalf of\nthe Swift Team:\n\nAt 15:21:32 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 110610A (trigger=455155).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 308.151, +74.823 which is \n   RA(J2000)  =  20h 32m 36s\n   Dec(J2000) = +74d 49' 22\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve shows several peaks\nwith a duration of about 60 sec.  The peak count rate\nwas ~6000 counts/sec (15-350 keV), at ~35 sec after the trigger. \n\nThe XRT began observing the field at 15:22:43.9 UT, 71.8 seconds after\nthe BAT trigger. Using promptly downlinked data we find a bright,\nuncatalogued X-ray source located at RA, Dec 308.17636, 74.82415 which\nis equivalent to:\n   RA(J2000)  = 20h 32m 42.33s\n   Dec(J2000) = +74d 49' 26.9\"\nwith an uncertainty of 3.7 arcseconds (radius, 90% containment). This\nlocation is 24 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 gives a column density in excess of the Galactic value (1.32 x\n10^21 cm^-2, Kalberla et al. 2005), with an excess column of 9.4\n(+4.45/-3.60) x 10^21 cm^-2 (90% confidence). \n\nThe initial flux in the 2.5 s image was 8.90e-10 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nDue to a bright star in the field of view, UVOT products will be delayed. \n\nBurst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.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": 12065,
  "createdOn": 1307720194000,
  "email": "scott@milkyway.gsfc.nasa.gov",
  "subject": "GRB 110610A: Swift detection of a burst",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>",
  "eventId": "GRB 110610A"
}