TITLE: GCN CIRCULAR NUMBER: 12057 SUBJECT: GRB 110530A: Swift/UVOT Detection of a Fading Afterglow DATE: 11/05/31 14:14:04 GMT FROM: Frank Marshall at GSFC F. E. Marshall (NASA/GSFC) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 110530A 438 s after the BAT trigger (D'Avanzo et al., GCN Circ. 12046). A fading source consistent with the enhanced XRT position (Evans et al., GCN Circ. 12055) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 18:48:16.40 = 282.06833 (deg.) Dec (J2000) = +61:55:44.9 = 61.92913 (deg.) with an estimated uncertainty of 0.65 arc sec. (radius, 90% confidence). Preliminary detections using the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 438 1015 295 20.31 +/- 0.10 white 7070 8315 1042 21.52 +/- 0.21 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.06 in the direction of the burst (Schlegel et al. 1998).