Abstract: Active Galactic Nuclei (AGN) are among the most powerful persistent particle accelerators in our universe. They have been studied for more than half a century, but they are still far from being understood. The advent of new instrumentation for photon and neutrino astronomy brings new perspectives that are starting to help out unraveling the insights of these powerful cosmic accelerators. Among all AGNs, the best candidates to probe the evolution of the particle distribution are the those that are nearby and bright throughout the electromagnetic spectrum. We will present results from extensive multi-instrument observations of a few bright and nearby AGNs and will discuss the complexity in the temporal evolution of the broadband emission. These MWL data can be used to derive particle populations under certain model assumptions, and the next step is to validate these models (and the related dynamics) with dedicated simulations for particle acceleration and temporal evolution.
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