TITLE: GCN CIRCULAR NUMBER: 14218 SUBJECT: GRB 130215A: RAPTOR Measurements DATE: 13/02/15 17:56:46 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 follow-up observations of Swift trigger 548760 (D'Elia, et al., GCN 14204). Our narrow-field instruments in Los Alamos, NM USA, began imaging at 01:43:07.0 UT, 696.8 s after the Swift BAT trigger. We detect the optical counterpart initially reported by the ROTSE team (Zheng, et al., GCN 14205). Our unfiltered images are calibrated to the USNO-B1 r-band. The following table gives a sample of our observations. T-Start Exp-Time Mag +/- error ------------------------------------ 696.85 5.0 13.73 +/- 0.014 725.35 5.0 13.70 +/- 0.015 762.35 5.0 13.74 +/- 0.014 796.75 10.0 13.80 +/- 0.009 927.55 10.0 13.98 +/- 0.010 1089.9 30.0 14.13 +/- 0.006