TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5605 SUBJECT: GRB 060923A: Gemini Second Epoch and Afterglow Confirmation DATE: 06/09/24 22:34:47 GMT FROM: Derek Fox at PSU D.B. Fox (Penn State) reports on behalf of a larger collaboration: "We have imaged the Swift XRT localization region for GRB060923A (Stamatikos et al., GCN 5583) with Gemini-North + NIRI on a second occasion. The candidate afterglow of Tanvir et al. (GCN 5587) and Fox et al. (GCN 5597) is no longer detected, and we estimate its brightness as: K-band: Ks>21.5 mag at 05:05 UT, 24 Sep (mean epoch) using the same photometric calibration as for the previous night (GCN 5597). Fading of the candidate by >~1 mag between our two epochs is separately confirmed in an image subtraction analysis. This confirms the afterglow nature of the source, and thus the highly reddened, high-redshift and/or highly-extinguished nature of the afterglow of GRB 060923A."