TITLE: GCN CIRCULAR NUMBER: 14177 SUBJECT: GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval DATE: 13/02/01 19:23:05 GMT FROM: James Wren at LANL J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis, of Los Alamos National Laboratory report: The RAPTOR network of robotic optical telescopes made observations of Swift trigger 547407 (Grupe, et al., GCN 14156). The burst location was within the field of our wide-field monitor located in Maui, HI, which began a 10 s integration of the location at 13:56:20.65 UT, 1.4 s before the Swift trigger time and during the gamma-ray emitting interval. During the period that the BAT was detecting gamma-ray emission, from ~T-5 s to ~T+65 s (Palmer, et al., GCN 14163), we have a total of four 10 s exposures with limiting magnitudes of R~9.4 in moderate moonglow. We do not detect the optical counterpart (Tanvir et al., GCN 14157; Virgili et al., GCN 14158) in any of our images. Our 3-sigma limiting magnitudes are based on a comparison of our unfiltered image to the Tycho-2 V-band catalog.