GCN Circular 7386
B. E. Cobb, part of the larger SMARTS consortium, reports: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 080310 (GCN 7382, Cummings et al.) beginning 20 minutes post-burst (2008-03-10 08:58 UT). Total summed exposure times amounted to 180s in BRIYJK and 120s in H and V. The afterglow of GRB 080310 (GCN 7382, Cummings et al. & GCN 7383, Chornock 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: time post-burst I mag J mag ~25 minutes 16.3+/-0.2 15.9+/-0.2 The afterglow fades by ~0.4 magnitudes in I between 25 and 45 minutes post-burst. This source is therefore confirmed to be the afterglow of GRB 080310, with a decay rate of alpha ~ -0.6.