TITLE: GCN CIRCULAR NUMBER: 17161 SUBJECT: GRB 141212A: Skynet R-COP Observations DATE: 14/12/12 15:14:45 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, J. Haislip, D. Reichart, A. Verveer, T. Spuck, A. Aji, R. Beauchemin, T. Berger, A. Dow, A. Foster, N. Frank, M. Hinckle, K. Ivarsen, A. LaCluyze, M. Maples, J. Moore, M. Nysewander, C. Salemi, L. Zbinden, and J. A. Crain report: Skynet observed the Swift BAT/XRT localization of GRB 141212A (Ukwatta et al., GCN 17158, Swift trigger=621229) with the 14" R-COP telescope at Perth Observatory, Australia. Starting at 2014-12-12 12:24 UT and continuing until 14:13 UT (t=10.2m-119m post-trigger), Skynet took a total of 24x160s exposures in the B, V, R, and I bands. We stacked subsets of these images to maximize the S/N ratio, and detected no optical source in any band at the XRT position. Our 3-sigma limiting magnitudes are: ================================== tmid expos fil limit ================================== 87m 7x160s B >19.9 106m 8x160s V >20.5 41m 3x160s R >20.0 30m 2x80s I >18.5 ================================== Limiting magnitudes are in the Vega System, calibrated to 6 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.09 (Schlafly & Finkbeiner 2011). No further Skynet observations are scheduled.