TITLE: GCN CIRCULAR NUMBER: 14507 SUBJECT: GRB 130427A: SARA-N detection DATE: 13/04/29 21:18:59 GMT FROM: Dieter Hartmann at Clemson.U William C. Keel (U. of Alabama, Tuscaloosa), Dieter Hartmann and Aman Kaur (Clemson University) report: We observed the field of GRB 130427A (Maselli, et al., GCN 14448) with the SARA 0.9m telescope at KPNO (http://saraobservatory.org) from 0350-0420 UT on April 29, obtaining a total of 30 min exposure in the B,V, and R band. We detect the optical afterglow (Elenin et al; GCN14450) in all bands. In comparison with Landolt (PG 0942) standard stars we find B = 19.32 V = 19.00 R = 18.53 These magnitudes are not corrected for Galactic extinction, but include KPNO airmass corrections at the time of observation. This message may be cited