TITLE:   GCN CIRCULAR
NUMBER:  17577
SUBJECT: GRB 150314A: Skynet Yerkes-41 Observations of the Optical Afterglow
DATE:    15/03/14 14:04:24 GMT
FROM:    Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet  <atrotter@physics.unc.edu>

A. Trotter, D. Reichart, A. LaCluyze, J. Haislip, V. Hoette, K. Cudworth, D. Harper, R. Kron, T. Linder, R. Russell, E. Struble, A. Aji, T. Berger, A. Dow, A. Foster, N. Frank, K. Ivarsen, M. Maples, J. Moore, M. Nysewander, C. Salemi, and J. A. Crain report:

Skynet observed the Swift BAT/XRT localization of GRB 150314A (Hagen et al., GCN 17573, Swift trigger=634795) with the 41" telescope at Yerkes Observatory in WI, USA, starting at 2015-03-14 04:58:22 (t=3.5m post-trigger) and continuing until t=41m post-trigger. Skynet took a total of 17 exposures ranging from 20s to 160s in the g', r' and i' bands. We detect a fading source in all three bands at the position reported by Zheng & Filippenko (GCN 17574).

A preliminary light curve is at:
http://www.skynet.unc.edu/grb/grb150314a.png

Magnitudes are in the AB System, calibrated to 4 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.