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The narrow-line Seyfert 1 galaxy (NLS1) Mrk 335 has been continuouslymonitored with Swift since May 2007 when it fell into a long-lasting, X-raylow-flux interval. Results from the nearly 11 years of monitoring are presentedhere. Structure functions are used to measure the UV-optical and X-ray powerspectra. The X-ray structure function measured between 10-100 days isconsistent with the flat, low-frequency part of the power spectrum measuredpreviously in Mrk 335. The UV-optical structure functions of Mrk 335 arecomparable with those of other Seyfert 1 galaxies and of Mrk 335 itself when itwas in a normal bright state. There is no indication that the current X-raylow-flux state is attributed to changes in the accretion disc structure of Mrk335. The characteristic timescales measured in the structure functions can beattributed to thermal (for the UV) and dynamic (for the optical) timescales ina standard accretion disc. The high-quality UVW2 (~1800 A in the source frame)structure function appears to have two breaks and two different slopes between10-160 days. Correlations between the X-ray and other bands are not highlysignificant when considering the entire 11-year light curves, but moresignificant behaviour is present when considering segments of the light curves.A correlation between the X-ray and UVW2 in 2014 (Year-8) may be predominatelycaused by an giant X-ray flare that was interpreted as jet-like emission. In2008 (Year-2), possible lags between the UVW2 emission and other UV-opticalwaveband may be consistent with reprocessing of X-ray or UV emission in theaccretion disc.

Eleven years of monitoring the Seyfert 1 Mrk 335 with Swift: Characterizing the X-ray and UV/optical variability