{
  "version": 2,
  "bibcode": "2007GCN..6263....1B",
  "body": "N. R. Butler and J. S. Bloom (UC Berkeley) report:\n\nUsing 53.6 ksec of exposure by the Swift XRT on the field of GRB070406\n(Cummings et al.; GCN 6247), we derive a refined astrometrically-corrected\nposition for the X-ray afterglow candidate (Troja et al.; GCN 6255) of\n\nRA= 13 15 51.51 , Dec= +16 30 48.1  +/- 2.7\" (90% Conf.)\n\n(http://astro.berkeley.edu/~nat/swift/xrt_pos.html, DSS position v1.3).\n\nThe position is within 1.4\" of (and the X-ray source is likely associated\nwith) the bright optical source reported by Kann (GCN 6256) and found\nto be a quasar by Berger et al. (GCN 6262).\n\nExamining the arrival times for 70 source counts in comparison to the detector\non-times, we find a KS-test probability that the source rate is steady\nand non-fading of 80%.  It is thus very unlikely that this X-ray source\nand the associated possible optical counterparts are the afterglow of\nGRB070406.",
  "email": "nrbutler@space.mit.edu",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
  "subject": "GRB 070406: Astrometrically Refined XRT Position, Unfading Source",
  "format": "text/plain",
  "circularId": 6263,
  "submitter": "Nat Butler at MIT/CSR  <nrbutler@space.mit.edu>",
  "editedOn": 1744224329024,
  "createdOn": 1176148423000,
  "eventId": "GRB 070406"
}