TITLE: GCN CIRCULAR NUMBER: 8283 SUBJECT: GRB 080922: Swift/UVOT Upper Limits DATE: 08/09/23 14:52:56 GMT FROM: Stephen Holland at USRA/NASA/GSFC/SSC S. T. Holland (CRESST/GSFC/USRA) and B. Sbarufatti (INAF-IASFPa) report on the behalf of the Swift UVOT team: The Swift/UVOT observed the field of GRB 080922 starting 13,904 s (= 3.84 hr) after the INTEGRAL detection (Mereghetti et al. 2008, GCN Circ. 8281). We do not find any new source, relative to the DSS or 2MASS, or any variable source inside the INTEGRAL/IBAS error circle. The 3-sigma upper limits for detecting a source in the co-added images, using a 2.5 arcsecond radius circular aperture, are: Filter T_start T_stop Exp(s) Mag ----------------------------------------- v 15,622 15,834 208 >18.9 b 14,550 26,731 625 >20.6 u 14,333 31,298 834 >20.3 uvw1 13,904 30,081 1668 >20.5 uvm2 15,839 15,853 14 >16.1 uvw2 14,769 27,419 2341 >20.8 ----------------------------------------- The quoted upper limits have not been corrected for the expected, and highly uncertain, Galactic extinction along the line of sight corresponding to a reddening of E_{B-V} = 20 mag (Schlegel, et al., 1998, ApJS, 500, 525). All photometry is on the UVOT flight system described in Poole et al. (2008, MNRAS, 383, 627).