TITLE: GCN CIRCULAR NUMBER: 19616 SUBJECT: GRB 160625B: SMARTS optical/IR afterglow observations DATE: 16/06/28 20:56:18 GMT FROM: Bethany Cobb at GWU 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 160625B (GCN 19580, Dirirsa et al.) with a mid-exposure time of about 32 hours post-burst (2016-06-27 06:51 UT). Total summed exposure times amounted to 36 minutes in I and 30 minutes in J. The afterglow of GRB 160625B (e.g. GCN 19585, Melandri et al.; GCN 19588, Troja et al.; GCN 19589, Oates et al.) is detected in our images. Preliminary comparison to USNO-B1.0 stars in I and 2MASS stars in J indicates the following afterglow magnitudes: mid-exposure time post-burst I mag J mag 1.338 days 18.9+/-0.2 18.6+/-0.1