TITLE: GCN CIRCULAR NUMBER: 6660 SUBJECT: Swift/UVOT refined analysis of GRB070724 DATE: 07/07/24 18:05:38 GMT FROM: Massimiliano de Pasquale at MSSL-UCL M. De Pasquale (MSSL-UCL) and H. Ziaeepour (MSSL-UCL) report on the behalf of the Swift UVOT/team: The Swift/UVOT observed the field of GRB070724 starting 58s after the BAT trigger (Ziaaepour et al. GCN circ. 6654). Inside the refined XRT error circle (Page et al., GCN circ 6659) we do not find any new source, either in the first finding chart exposures in the White and V filter or in the summed exposures of any of the UVOT filters. The 3 sigma upper limits for detecting a source inside the XRT error circle are: Filter T obs (s) Exp (s) Mag (3 sigma u.l.) White 76-176 98 20.4 v 182-581 393 19.5 White 76-5531 380 21.1 v 182-5941 806 20.0 b 662-5325 216 20.3 u 636-6456 332 20.0 uvw1 612-6352 432 20.4 uvm2 587-6146 432 20.4 uvw2 692-5736 432 20.7 No correction has been done for the expected low Galactic reddening towards the burst, E(B-V)=0.01 (Schlegel et al. 11998).