TITLE: GCN CIRCULAR NUMBER: 14497 SUBJECT: GRB 130427A: Skynet/PROMPT Observations DATE: 13/04/29 05:45:38 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, D. Reichart, J. Haislip, A. LaCluyze, T. Berger, H. T. Cromartie, R. Egger, A. Foster, N. Frank, K. Ivarsen, M. Maples, J. Moore, M. Nysewander, E. Speckhard, and J. A. Crain report: Skynet observed the Swift/XRT localization of GRB 130427A (Maselli et al., GCN 14448, Swift trigger #554620) with four 16" telescopes of the PROMPT array at CTIO, Chile, starting at 2013-04-27, 23:28 UT, and continuing until 04-28, 05:30 UT (t=15.69h-21.67h post-trigger). It took ~124 160-s exposures, simultaneously in each of the BVRI bands. We performed photometry on each exposure, calibrated to two SDSS stars in the field. We detect a fading afterglow in BVRI at the position reported by Elenin et al. (GCN 14450), which is ~50" south of the initial XRT localization. A preliminary light curve of the first night's data is at: http://skynet.unc.edu/grb/grb130427a.png Further Skynet observations are ongoing.