TITLE: GCN CIRCULAR NUMBER: 11088 SUBJECT: GRB 100814A: Swift UVOT observations of the optical afterglow DATE: 10/08/14 04:49:29 GMT FROM: Caryl Gronwall at PSU/Swift-UVOT C. Gronwall (PSU) and C. J. Saxton (MSSL) report on behalf of the Swift/UVOT team: In response to GRB 100814A (Swift/BAT trigger 431605) at 03:50:11 UT, UVOT took a finding chart exposure of 250 seconds with the U filter starting 153 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 01:29:53.54 = 22.47309 DEC(J2000) = -17:59:43.5 = -17.99541 with a 90%-confidence error radius of about 0.75 arc sec. This position is 4.7 arc sec. from the center of the XRT error circle. This position supersedes the position given in (Beardmore et al., GCN Circ. 11087) and is consistent with the optical afterglow position from ROTSE (Schaefer et al., GCN Circ. 11086). The estimated magnitude is 16.76 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.