{
  "subject": "GRB 180704A: Swift-XRT observations",
  "eventId": "GRB 180704A",
  "bibcode": "2018GCN.22887....1B",
  "createdOn": 1530688732000,
  "circularId": 22887,
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "email": "pae9@leicester.ac.uk",
  "body": "D.N. Burrows (PSU), J.A. Kennea (PSU), M. Perri (ASDC), G. Tagliaferri\n(INAF-OAB), P.A. Evans (U. Leicester) and J.P. Osborne (U. Leicester)\nreport on behalf of the Swift-XRT team:\n\nThe XRT began observing the field of GRB 180704A at 06:26:11.9 UT,\n2969.1 seconds after the BAT trigger. Using promptly downlinked data we\nfind an uncatalogued X-ray source with an enhanced position: RA, Dec\n32.6592, 69.9641 which is equivalent to:\n   RA(J2000)  = 02h 10m 38.22s\n   Dec(J2000) = +69d 57' 50.7\"\nwith an uncertainty of 2.1 arcseconds (radius, 90% containment). This\nlocation is 63 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 consistent with the Galactic value of 4.92\nx 10^21 cm^-2 (Willingale et al. 2013)."
}