TITLE: GCN CIRCULAR NUMBER: 15084 SUBJECT: GRB 130806A: Swift/UVOT Upper Limits DATE: 13/08/08 14:49:32 GMT FROM: Stephen Holland at STScI S. T. Holland (STScI) and B. P. Gompertz (U Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130806A starting 69 s after the BAT trigger (Gompertz et al. 2013, GCNC 15071). We do not detect any new source consistent with the UVOT-enhanced XRT position (Beardmore et al. 2013, GCNC 15072) in any of the UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the finding chart (FC) exposures and initial summed exposures are presented below. ------------------------------------------------- Filter TSTART TSTOP Exposure Mag ------------------------------------------------- white (FC) 69 218 147 >20.6 u (FC) 282 305 23 >18.2 ------------------------------------------------- b 3571 11,831 1028 >21.3 u 4801 11,172 1082 >21.4 v 4187 5823 393 >19.9 uvw1 4597 10,259 1116 >21.2 uvm2 4391 15,843 1066 >20.9 uvw2 3982 5618 393 >20.7 white 3776 5411 393 >21.8 ------------------------------------------------- The quoted upper limits have not been corrected for the expected extinction due to the Galactic reddening along the line of sight to this burst of E(B-V) = 1.02 mag (Schlafly et al. 2011, ApJS, 737, 103). GRB 130806A was 6 degrees above the Galactic Plane, so this extinction value is highly uncertain.