TITLE: GCN CIRCULAR NUMBER: 14075 SUBJECT: GRB 121211A: RAPTOR Limits During Gamma-Ray Emitting Interval DATE: 12/12/13 01:05:47 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 541200 (Mangano, et al., GCN 14057). 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 03:47:00.17 UT, 2.8 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+200 s (Barthelmy, et al., GCN 14067), we have a total of twenty 10 s exposures with limiting magnitudes of R~9.8. We do not detect the optical counterpart 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.