TITLE: GCN CIRCULAR NUMBER: 3104 SUBJECT: GRB 050315, SMARTS optical/IR afterglow observations DATE: 05/03/16 22:18:02 GMT FROM: Bethany Cobb at Yale U B. E. Cobb and C. D. Bailyn (Yale), part of the larger SMARTS consortium, report: Using the ANDICAM instrument on the 1.3m telescope at CTIO, we obtained optical/IR imaging of the error region of GRB 050315 (GCN 3094, Parsons et al.) beginning ~11.6 hours post-burst (2005-03-16 08:35:09 UT). Total summed exposure times amounted to 180s in BRIYJK and 120s in H and V. An optical source is detected in R and I at the coordinates of the reported optical afterglow candidate (GCN 3100, Kelson & Berger). This source is, however, only slightly brighter than our detection limits. Preliminary comparison with Landolt Standard PG 1047+003 and USNO B1.0 stars yields the following approximate afterglow magnitudes: R = 20.9 I = 20.3 No source was detected in B or V with upper limits of B > 22.3 and V > 21.4. Additionally, the afterglow candidate is not detected in the IR images to the following detection limits (obtained by comparison with 2MASS): J > 18.0 H > 17.4 K > 16.3