TITLE: GCN CIRCULAR NUMBER: 6784 SUBJECT: GRB 070913: SMARTS optical/IR observations DATE: 07/09/13 02:08:48 GMT FROM: Bethany Cobb at Yale U B. E. Cobb (Yale), 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 070913 (Markwardt et al. GCN 6782) with a mid-exposure time of (2007-09-13 01:11 UT, ~34 minutes post-burst). Optical imaging in B,V,R and I has a field of view of 6'x6' and, therefore, covers the entire GRB error circle. IR imaging in J, H, K and Y has a smaller field of view and covers a region totalling 3 square arcminutes in the middle of the quoted error region. Several dithered images were obtained in each filter, with total summed exposure times of 180s in each of BRIYJK and 120s in each of H and V. Preliminary visual comparison of the optical images to the DSS and the IR images to 2MASS frames does not reveal any new sources to a limiting magnitude of I>18.2 and J>15.8 (calibrated using USNO-B1.0 and 2MASS stars). [GCN OPS NOTE (13sep07): Per author's request, the following statement was added: "Due to the recalculated BAT position position (#6785), the SMARTS observations actually do not cover any of the GRB error region for this burst."]