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Blazars are a class of active galactic nuclei (AGNs) known for their veryrapid variabilty in the high energy regions of the electromagnetic spectrum.Despite this known fast variability, X-ray observations have generally notrevealed variability in blazars with rate doubling or halving timescales lessthan approximately 15 min. Since its launch, the Swift X-ray Telescope hasobtained 0.2-10 keV X-ray data on 143 AGNs, including blazars, through intensetarget of opportunity observations that can be analyzed in a multiwavelengthcontext and used to model jet parameters, particularly during flare states. Wehave analyzed this broad Swift data set in a search for short timescalevariability in blazars that could limit the size of the emission region in theblazar jet. While we do find several low-significance possible flares withpotential indications of rapid variability, we find no strong evidence forrapid ($<$15 minutes) doubling or halving times in flares in the soft X-rayenergy band for the AGNs analyzed.

A Search for Fast X-ray Variability from Active Galactic Nuclei using Swift