GCN Circular 8534
B. E. Cobb (UC Berkeley) reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 081016b (Page et al. GCN 8381) with a mid-exposure time of 4.3 hours post-burst (2008-10-17 00:06 UT). Total summed exposure times amounted to 36 minutes in I and 30 minutes in J. No source is detected at the position of the X-ray afterglow (Osborne et al. GCN 8383) to approximate limiting magnitudes of I > 22.1 and J > 19.8. Magnitudes are calibrated using Landolt standard stars in I, and 2MASS stars in J.