TITLE: GCN CIRCULAR NUMBER: 14523 SUBJECT: GRB 130427A: SARA-N optical observations DATE: 13/05/01 20:29:14 GMT FROM: Dieter Hartmann at Clemson.U Aman Kaur, Dieter Hartmann (Clemson University), and William C. Keel (U. of Alabama, Tuscaloosa), report: We continued our observations of GRB 130427A (Maselli, et al., GCN 14448) with the SARA 0.9m telescope at KPNO (http://saraobservatory.org) starting on April 29. We obtained a total of 190 min exposure in the R band, with a sequence of 36 five min exposures, and one ten min exposure. We detect the optical afterglow (Elenin et al; GCN14450) decay between R = 19.2 and R = 19.4 during that sequence, which implies a temporal power law decay of the flux density with a slope of alpha ~ 0.8 Magnitudes are not corrected for Galactic extinction. This message may be cited