  We are conducting an archival Swift program to measure multiwavelength
variability in active galactic nuclei (AGN). This variability information will
provide constraints on the geometry, physical conditions and processes of the
structures around the central black holes that emit and reprocess the observed
flux. Among our goals are: (1) to produce a catalog of type 1 AGN with
time-resolved multi-wavelength data; (2) to characterize variability in the
optical, UV and X-ay bands as well as changes in spectral slope; (3) to
quantify the impact of variability on multi-wavelength properties; and (4) to
measure correlated variability between bands. Our initial efforts have revealed
a UVOT calibration issue that can cause a few percent of measured UV fluxes to
be anomalously low, by up to 30%.
