TITLE: GCN CIRCULAR NUMBER: 14871 SUBJECT: GRB 130609A: Swift/UVOT Upper Limits DATE: 13/06/11 14:56:06 GMT FROM: Stephen Holland at STScI S. T. Holland (STScI) and J. R. Cummings (NASA/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130609A starting 70 s after the BAT trigger (Cummings et al. 2013, GCNC 14828). We do not detect any new source consistent with the UVOT-enhanced XRT position (Evans 2013, GCNC 14835) 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) 70 220 147 >21.0 562 582 19 >19.8 u (FC) 282 532 246 >20.3 686 706 19 >18.6 ------------------------------------------------- v 612 6212 413 >19.9 b 537 18,175 1773 >21.7 u 5191 23,545 2254 >21.4 uvw1 4987 23,257 2164 >21.5 uvm2 4782 22,351 1279 >21.3 uvw2 4372 6007 393 >20.8 white 4166 12,406 1022 >22.0 ------------------------------------------------- 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) = 0.03 mag (Schlafly et al. 2011, ApJS, 737, 103).