TITLE: GCN CIRCULAR NUMBER: 7881 SUBJECT: GRB080613A: Swift/UVOT Upper Limits DATE: 08/06/14 02:43:26 GMT FROM: Erik Hoversten at Swift/Penn State E. A. Hoversten (PSU) and S. T. Holland (CRESST/USRA/GSFC) on behalf of the Swift/UVOT team. The Swift Ultra-Violet/Optical Telescope (UVOT) began settled observations of the INTEGRAL-detected GRB 080613A (Gotz, et al., GCN Circ. 7871) 6.7 hours after the trigger. No afterglow is detected at the position of the R-band detection by the Faulkes Telescope North (Guidorzi, et al., GCN Circ. 7872). The 22.2 magnitude upper limit in the white band suggests the R~19 object seen by Guidorzi, et al. 3.9 minutes after the trigger has faded and is indeed the afterglow. Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig) white 24725 25189 456 >22.2 v 25195 25638 436 >20.5 b 24257 24720 456 >21.5 The values quoted above are in the UVOT photometric system (Poole et al. 2008, MNRAS, 383, 627). They are not corrected for the expected Galactic extinction corresponding to a reddening of E(B-V)=0.023 mag in the direction of the burst (Schlegel et al. 1998).