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Swift has initiated a new era of understanding the extremes of activegalactic nuclei (AGN) variability, their drivers and underlying physics. Thisis based on its rapid response, high sensitivity, good spatial resolution, andits ability to collect simultaneously X--ray-to-optical SEDs. Here, we presentresults from our recent monitoring campaigns with Swift of highly variable AGN,including outbursts, deep low states, and unusual long-term trends in severalSeyfert galaxies including Mrk 335, WPVS007, and RXJ2314.9+2243. We also reportdetection of a new X-ray and optical outburst of IC 3599 and our Swiftfollow-ups. IC 3599 was previously known as one of the AGN with thehighest-amplitude outbursts. We briefly discuss implications of this secondoutburst of IC 3599 for emission scenarios including accretion-diskvariability, repeat tidal disruption events, and the presence of a binarysupermassive black hole.

Seyfert galaxies with Swift: giant flares, rapid drops, and other surprises