GCN Circular 20432
B. E. Cobb (GWU) reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 170111A (GCN 20423, Beardmore et al.) with a mid-exposure time of about 1 hour post-burst (2017-01-11 01:36 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 (GCN 20424, Evans et al.) in either I or J, to an approximate 3-sigma limiting magnitude of I > 21.9 (calibrated using USNO-B1.0 stars).