GCN Circular 8538
S. R. Oates and P. Schady (MSSL-UCL) report on behalf of the Swift UVOT team: The Swift/UVOT began observing the field of GRB081121 starting 2816 seconds after the BAT trigger (Oates et al., GCN 8537) with a White finding chart exposure of 150 seconds. There is a candidate afterglow in the 2.7'x2.7' sub- image at RA(J2000) = 05:57:06.19 = 89.27581 DEC(J2000) = -60:36:10.3 = -60.60286 with a 90%-confidence error radius of about 0.62 arc sec. This position is 0.7 arc sec. from the center of the XRT error circle and is consistent with the position of the optical afterglow found by ROTSE-IIIc (Yuan el al., GCN 8536). The estimated magnitude is 17.98 with a 1-sigma error of about 0.04. No correction has been made for the expected extinction corresponding to E(B-V) of 0.05.