TITLE: GCN CIRCULAR NUMBER: 17028 SUBJECT: GRB 141017A: Skynet PROMPT-CTIO/SSO Observations DATE: 14/11/05 15:40:00 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, J. Haislip, D. Reichart, 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 XRT localization of GRB 141017A (Marshall et al., GCN 16919, Swift trigger=615672) with one 24" telescope (P-CTIO 8; I band) and three 16" telescopes (P-CTIO 1,4,5; V,R,I bands) of the PROMPT array at CTIO, Chile, and with one 16" telescope (P-SSO 3; R band) of the PROMPT array at Siding Spring Observatory, Australia. Starting at 2014-10-18 01:10 UT and continuing until 2014-10-20 02:26 UT (t=6.7h-2.3d post-trigger), Skynet took a total of 2316 exposures ranging from 80s-160s each. We stacked subsets of these images to maximize the S/N ratio, and detected no optical source in any band at the OT position reported by Swift UVOT (Oates & Marshall, GCN 16924) and confirmed by GROND (Kann, Guelbenzu & Greiner, GCN 16926). Our 3-sigma limiting magnitudes are: ================================== tmid scope expos fil limit ================================== 7.4h P-CTIO4 26x160s R >21.1 11.2h P-CTIO8 260x80s I >22.2 11.2h P-CTIO1 147x160s V >22.6 11.3h P-CTIO5 143x160s I >22.0 20.8h P-SSO3 134x160s R >22.3 36.5h P-CTIO1 40x160s V >22.0 37.2h P-CTIO8 60x80s I >21.3 37.3h P-CTIO5 33x160s I >21.4 37.9h P-CTIO4 28x160s R >21.7 44.8h P-SSO3 133x160s R >22.4 2.3d P-CTIO1 30x160s V >21.4 2.3d P-CTIO5 30x160s I >20.7 2.3d P-CTIO8 53x80s I >20.5 2.3d P-CTIO4 22x160s R >21.1 ================================== Magnitudes are in the Vega System, calibrated to 5 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.035 (Schlafly & Finkbeiner 2011). No further Skynet observations are scheduled.