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One of the key ingredients of the Unified Model of Active Galactic Nuclei(AGN) is the presence of a torus-like optically thick medium composed by dustand gas around the putative supermassive black hole. However, the structure,size and composition of this circumnuclear medium are still matter of debate.To this end, the search for column density variations through X-ray monitoringon different timescales (months, weeks and few days) is fundamental toconstrain size, kinematics and location of the X-ray absorber(s). Here wedescribe our project of mining the Swift-XRT archive to assemble a sample ofAGN with extreme column density variability and determining the physicalproperties of the X-ray absorber(s). We also present the results obtained froma daily-weekly Swift-XRT follow-up monitoring recently performed on one of themost interesting new candidates for variability discovered so far, Mrk 915.

Mining the XRT archive to probe the X-ray absorber structure in the AGN population