{
  "bibcode": "2006GCN..5605....1F",
  "body": "D.B. Fox (Penn State) reports on behalf of a larger collaboration:\n\n\"We have imaged the Swift XRT localization region for GRB060923A\n(Stamatikos et al., GCN 5583) with Gemini-North + NIRI on a second\noccasion.  The candidate afterglow of Tanvir et al. (GCN 5587) and Fox\net al. (GCN 5597) is no longer detected, and we estimate its\nbrightness as:\n\n   K-band:  Ks>21.5 mag at 05:05 UT, 24 Sep (mean epoch)\n\nusing the same photometric calibration as for the previous night (GCN\n5597).  Fading of the candidate by >~1 mag between our two epochs is\nseparately confirmed in an image subtraction analysis.\n\nThis confirms the afterglow nature of the source, and thus the highly\nreddened, high-redshift and/or highly-extinguished nature of the\nafterglow of GRB 060923A.\"",
  "circularId": 5605,
  "createdOn": 1159137287000,
  "email": "dfox@astro.psu.edu",
  "subject": "GRB 060923A:  Gemini Second Epoch and Afterglow Confirmation",
  "submitter": "Derek Fox at PSU  <dfox@astro.psu.edu>",
  "eventId": "GRB 060923A"
}