  The narrow-line Seyfert 1 galaxy (NLS1) Mrk 335 has been continuously
monitored with Swift since May 2007 when it fell into a long-lasting, X-ray
low-flux interval. Results from the nearly 11 years of monitoring are presented
here. Structure functions are used to measure the UV-optical and X-ray power
spectra. The X-ray structure function measured between 10-100 days is
consistent with the flat, low-frequency part of the power spectrum measured
previously in Mrk 335. The UV-optical structure functions of Mrk 335 are
comparable with those of other Seyfert 1 galaxies and of Mrk 335 itself when it
was in a normal bright state. There is no indication that the current X-ray
low-flux state is attributed to changes in the accretion disc structure of Mrk
335. The characteristic timescales measured in the structure functions can be
attributed to thermal (for the UV) and dynamic (for the optical) timescales in
a standard accretion disc. The high-quality UVW2 (~1800 A in the source frame)
structure function appears to have two breaks and two different slopes between
10-160 days. Correlations between the X-ray and other bands are not highly
significant when considering the entire 11-year light curves, but more
significant behaviour is present when considering segments of the light curves.
A correlation between the X-ray and UVW2 in 2014 (Year-8) may be predominately
caused by an giant X-ray flare that was interpreted as jet-like emission. In
2008 (Year-2), possible lags between the UVW2 emission and other UV-optical
waveband may be consistent with reprocessing of X-ray or UV emission in the
accretion disc.
