{
  "bibcode": "2009GCN..9463....1S",
  "body": "B. Sbarufatti, V. Mangano (INAF-IASFPA) and\nJ. R. Cummings (NASA/UMBC) report on behalf of the\nSwift-XRT team\n\n\nThe XRT began observing the field of GRB 090531B\n(trigger 353728, Cummins,  et al., GCN Circ 9461) at\n19:26:22 UT, 3026 seconds after the BAT trigger, as\nsoon as the burst went outside the Earth limb observing\nconstraint.\nUsing promptly downlinked data we find an X-ray\nsource with an enhanced position: RA,Dec = 252.0748, -36.0350\n(degrees) which is equivalent to:\n\nRA  (J2000.0) = 16 48 17.95\nDEC (J2000.0) = -36 02 06.0\n\nwith an uncertainty of 3.4 arcsec (radius, 90% containment).\nThis location is 47.8 arcseconds from the BAT onboard position, inside  \nthe BAT\nerror circle.\n\nThis circular is an official product of the Swift-XRT team.\n\n[GCN OPS NOTE(03sep09): Per operator's desire, the Subject line\nwas corrected from \"090831B\" to \"090531B\". F.Marshall and H.Krimm noticed this.]",
  "circularId": 9463,
  "createdOn": 1243801670000,
  "email": "sbarufatti@ifc.inaf.it",
  "subject": "GRB 090531B: Swift-XRT candidate afterglow position",
  "submitter": "Boris Sbarufatti at INAF-IASF-Pa  <sbarufatti@ifc.inaf.it>",
  "eventId": "GRB 090531B"
}