TITLE: GCN CIRCULAR NUMBER: 16514 SUBJECT: GRB 140703A: P60 observations of a red, slowly-fading afterglow DATE: 14/07/03 16:51:02 GMT FROM: Daniel Perley at Caltech D. A. Perley (Caltech) and S. B. Cenko (NASA/GSFC) report: We observed the afterglow of GRB 140703A (Kocevski et al., GCN 16503) with the Palomar 60-inch (P60) robotic telescope. We acquired 3x180s in each of the r, i, and z filters between 08:40:37 and 09:11:02 on 2014-07-03 UT. We measure the following magnitudes: r = 20.03 +/- 0.02 t_mid = 0.3462 days i = 19.46 +/- 0.02 t_mid = 0.3380 days z = 18.99 +/- 0.05 t_mid = 0.3533 days This indicates very little fading since the observations of Cunniffe et al. (GCN 16504) and Ciabattari et al. (GCN 16511). However, the spectroscopy of Castro-Tirado et al. (GCN 16505) confirms this source is the GRB afterglow. We note that the afterglow color is fairly red (beta~2.2 after correction for foreground extinction), possibly indicating significant dust obscuration in the host frame.