TITLE: GCN CIRCULAR NUMBER: 16108 SUBJECT: GRB 140412A: Swift/UVOT Upper Limits DATE: 14/04/14 12:46:51 GMT FROM: Stephen Holland at STScI S. T. Holland (STScI) and V. D'Elia (ASDC) report on behalf of the Swift/UVOT team: Swift/UVOT began settled observations of the field of GRB 140412A 237 s after the BAT trigger (D'Elia et al. 2014, GCNC 16097). We do not detect any new source consistent with the UVOT-enhanced XRT afterglow position (Goad et al. 2014, GCNC 16100) 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 and summed exposures are presented below. --------------------------------------------------- Filter TSTART TSTOP Exposure Mag --------------------------------------------------- v 393 1055 69 >19.0 b 491 6805 255 >21.0 u 466 6599 309 >20.6 uvw1 442 4815 255 >20.0 uvm2 418 4610 255 >19.6 uvw2 541 1040 58 >18.7 white 237 6811 336 >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) = 0.19 mag (Schlafly et al. 2011, ApJS, 737, 103).