TITLE: GCN CIRCULAR NUMBER: 11871 SUBJECT: GRB 110402A: Swift/UVOT detection of afterglow candidate DATE: 11/04/03 02:32:55 GMT FROM: Craig Swenson at PSU/Swift C. A. Swenson (PSU) and T. N. Ukwatta (MSU)report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 110402A 548 s after the BAT trigger (Ukwatta et al., GCN Circ. 11857). We find a faint new source consistent with the enhanced XRT position (Beardmore et al., GCN Circ. 11860). Preliminary magnitudes and 3-sigma upper limits using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag --------------------------------------------------------------------- white_FC 548 698 147 >20.5 white 548 24657 1628 20.89 ±0.11 v 704 18897 510 >20.1 b 803 24593 1544 20.84 ±0.20 u 778 30417 430 >20.6 w1 754 30390 1296 20.39 ±0.22 m2 7176 7376 197 >19.7 w2 6767 18791 1112 20.29 ±0.20 The values quoted above are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).