TITLE: GCN CIRCULAR NUMBER: 14870 SUBJECT: GRB 130608A: Swift/UVOT Upper Limits DATE: 13/06/11 14:55:09 GMT FROM: Stephen Holland at STScI S. T. Holland (STScI) and Hans Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130608A starting 168 s after the BAT trigger (Krimm et al. 2013, GCNC 14827). We do not detect any new source consistent with the UVOT-enhanced XRT position (Beardmore 2013, GCNC 14832) 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) 169 318 147 >21.0 607 626 19 >19.6 u (FC) 327 576 246 >20.1 731 750 19 >18.4 ------------------------------------------------- v 657 12,041 1154 >20.6 b 583 6742 452 >20.8 u 4899 6536 393 >20.5 uvw1 706 6331 432 >20.6 uvm2 681 12,759 1134 >21.3 uvw2 632 11,127 1199 >21.5 white 858 6946 560 >21.5 ------------------------------------------------- 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) = 0.05 mag (Schlafly et al. 2011, ApJS, 737, 103).