TITLE: GCN GRB OBSERVATION REPORT NUMBER: 5587 SUBJECT: GRB 060923: UKIRT nIR observations - candidate afterglow DATE: 06/09/23 07:57:00 GMT FROM: Nial Tanvir at IofA U.Cambridge N. Tanvir (U. Leicester), A. Levan (U. Hertfordshire), M. Jarvis (U. Oxford), T. Wold (JACH) We observed the field of GRB 060923 with UFTI on UKIRT, beginning at 06:07 (UT), approximately 55 minutes post-burst. We detect a faint source in the K-band image at approximately: 16 58 28.18 +12 21 38.9 This position (based on provisional astrometry) is only 4.6 arcsec from the reported XRT position (Stamatikos et al. GCN 5583). The source appears to have faded in another (shallower) K-band observation made 30 mins later, and therefore is likely to be the afterglow of this burst. Further analysis is ongoing.