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Presentation #108.13 in the session Time-domain Astrophysics - Poster Session.
Variability is a distinctive trait of Active Galactic Nuclei (AGN), and its study holds paramount importance for various reasons. The Neutron Star Interior Composition ExploreR (NICER), boasting a large effective area, provides an impressive temporal resolution of approximately 300 nanoseconds within the 0.2-10 KeV energy range. In this presentation, I will discuss recent findings from our study, employing the power spectral density analysis technique. By leveraging the exceptional temporal resolution offered by the NICER mission, our study aims to delve into the temporal variations of AGN on timescales shorter than ever before.