TITLE: GCN CIRCULAR NUMBER: 6689 SUBJECT: Swift/UVOT detection of GRB070714B DATE: 07/07/30 21:17:07 GMT FROM: Wayne Landsman at GSFC/SSAI W. Landsman (NASA/GSFC), F.E. Marshall (NASA/GSFC), and J. Racusin (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT observed the field of the short-hard burst GRB 070714B starting 70 s after the BAT trigger (Racusin et al. GCN Circ. 6620). Upper limits on individual exposures were reported by Landsman & Racusin (GCN Circ. 6632). We now combine all data obtained within the first 7350s and find detections in the white (4.5 sigma) and v (3.3 sigma) filters at the position of the source first reported by Melandri et al. (GCN Circ. 6621). The source is detected in each of the three UV filters at the ~2.9 sigma level. Presuming the detection in the UVW2 (2100 A) filter is real, an upper limit of ~1.3 can be set on the redshift. Filter Tstart Tstop Exp Mag (s) (s) (s) White 70 7143 628 20.95 ± 0.23 v 177 6117 1435 20.36 ± 0.32 7355 87569 4321 >20.9 (3 sigma) uvw1 607 6528 294 20.14 ± 0.38 11649 99315 9741 >22.1 (3 sigma) uvm2 583 6321 294 20.02 ± 0.37 10742 98409 8750 >22.3 (3 sigma) uvw2 687 7350 471 20.55 ± 0.37 16463 104208 5313 >22.1 (3 sigma)