TITLE: GCN CIRCULAR NUMBER: 10637 SUBJECT: GRB 100418A: SARA second epoch DATE: 10/04/20 21:07:59 GMT FROM: Adria C. Updike at Clemson U Adria C. Updike, Dieter H. Hartmann (Clemson University), and Chris De Pree (Agnes Scott College) report: We re-observed the field of GRB 100418A (Marshall et al., GCN 10612) using the 0.9m SARA telescope located at KPNO beginning 1.44 days after the trigger. Observations consisted of 40 minutes in the R band. We detect the afterglow (Filgas et al., GCN 10617) at R = 19.3 +/- 0.1, fading 1.0 mag from our previous detection (upon comparison to USNO B1.0 catalog field stars). Further observations are planned.