{
  "bibcode": "2007GCN..6610....1B",
  "body": "A.P. Beardmore, K.L. Page (U. Leicester) and A. Parsons (GSFC) report on\nbehalf of the Swift XRT team:\n\nOn 2007 Jul 08 00:57:50UT the Swift XRT started observing the field of\nthe INTEGRAL burst GRB 070707 (Beckmann et al., GCN 6606; Gotz et al.,\nGCN 6607). In a 3.8ks exposure photon counting mode image taken from\n31.8 ks to 54.1 ks after the trigger, we detect a source at\nRA, Dec = 267.7437, -68.9242, which is\n\nRA(J2000)  =  17h 50m 58.49s\nDec(J2000) = -68d 55m 27.0s\n\nwith an uncertainty of 5.4 arcsec (90% containment). This is 36.3 arcsec\nfrom the position reported by Gotz et al. (GCN 6607), and within their\nerror circle.\n\nUsing a circular extraction region of 10 pixels radius, we observe 26\ntotal counts. Together with an estimated background level of 1.0\ncount in the extraction region, we find the 99.73% Bayesian\nconfidence level on the source count rate is 0.003 to 0.011 count s^-1.\n\nHowever, with such a limited number of photons, it is impossible to\nsay at this stage whether the source is fading and if this is the X-ray\ncounterpart to the GRB.\n\nThis circular is an official product of the Swift XRT team.",
  "circularId": 6610,
  "createdOn": 1183920809000,
  "email": "apb@star.le.ac.uk",
  "subject": "Swift XRT observation of GRB 070707",
  "submitter": "Andy Beardmore at U Leicester  <apb@star.le.ac.uk>",
  "eventId": "GRB 070707"
}