TITLE: GCN CIRCULAR NUMBER: 8829 SUBJECT: GRB 090118: KPNO 4m Detection of Candidate Afterglow DATE: 09/01/19 21:29:12 GMT FROM: Adria C. Updike at Clemson U Adria C. Updike and Dieter H. Hartmann (Clemson University) report: Using the KPNO 4m telescope and the NEWFIRM instrument, we observed the field of GRB 090118 (GCN 8825, Copete et al.) beginning 11.6 hours after the burst in the J and H bands. Within the XRT error circle (Rowlinson & Page, GCN 8828) we detect a faint source at coordinates RA 03:19:18.6 Dec +18:24:54.3 Variability has not been confirmed. Further observations are planned. Time after burst Band Magnitude ------------------------------------------- 11.6 hours J 21.0 +/- 0.5 12.5 hours H 20.2 +/- 0.4 A total of 40 minutes of exposures were taken in each band and the results were stacked. Magnitudes are calibrated to the 2MASS point source catalog and against a nearby star (RA 03:19:16.7, Dec +18:25:14, J = 14.05). No correction has been made for galactic extinction.