TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3804 SUBJECT: GRB050814: SWIFT/UVOT observation DATE: 05/08/15 00:00:42 GMT FROM: Alexander Blustin at MSSL-UCL A. J. Blustin (UCL-MSSL), A. Retter (PSU), F. Marshall (GSFC), M. Chester (PSU), N. Gehrels (GSFC) on behalf of the Swift/UVOT team Swift/UVOT began observing the field of GRB050814 at 11:41:44 UT, 167 s after the BAT trigger (Retter et al., GCN 3799). We detect no new source with respect to the DSS image within the XRT error circle (Morris et al., GCN 3800) in summed images from any filter down to the following 3-sigma magnitude upper limits: Filter T_range Exp (s) 3-sig UL (mag) V 167-13371 1375 20.5 B 313-8353 1046 21.4 U 299-7587 1187 21.2 UVW1 285-6680 1194 20.3 UVM2 271-14137 1144 20.7 UVW2 328-12464 1277 20.8 Where T_range is the time range of the summed images in seconds post-trigger. These magnitudes are based on preliminary zero-points, measured in orbit, and will require refinement with further calibration.