TITLE: GCN CIRCULAR NUMBER: 19353 SUBJECT: GRB 160325A: Skynet PROMPT-CTIO observations of the optical afterglow DATE: 16/04/26 14:02:12 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, D. Reichart, J. Haislip, J. Moore, N. Frank, M. Maples, E. Johnson, R. Joyner, J. Martin, C. Salemi, J. A. Crain, K. Ivarsen, A. LaCluyze, and M. Nysewander report: Skynet observed the Swift BAT/XRT localization of GRB 160325A (Sonbas et al., GCN 19222, Swift trigger=680436) with with two 16" telescopes (P5, P6) and one 24" telescope (P1) of the PROMPT array at CTIO, Chile. Starting at 2016-03-25 07:01:44 UT and continuing until 09:55 UT (t=100s-2.9h post-trigger), Skynet took a total of 211 exposures ranging from 10-160s in the V band (P6) and the I band (P1,P5). We clearly detected a fading optical afterglow at the position first reported by Fugazza & Melandri (GCN 19223). A preliminary light curve is at: http://www.skynet.unc.edu/grb/grb160325a.png Magnitudes are in the Vega System, calibrated to 4 APASS DR9 stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.12 (Schlafly & Finkbeiner 2011). No further Skynet observations are scheduled.