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We present results from Chandra observations of NGC 5813, the dominantcentral galaxy in a nearby galaxy group. We focus on three main results. 1) Thediffuse gas shows clear signatures from three distinct outbursts of the centralAGN, with three pairs of roughly collinear cavities. The inner two cavity pairsare associated with unambiguous elliptical shock fronts, with Mach numbersM~1.7 and M~1.5 for the inner and outer shocks, respectively. 2) The mean powerof the two most recent outbursts differs by a factor of six, indicating thatthe mean jet power varies over long (~10^7 yr) time scales. 3) The heating fromthe shocks alone is sufficient to balance radiative cooling of the gas withinat least the central 10 kpc, allowing feedback to operate isotropically atsmall radii.

ICM Signatures from Multiple Outbursts in the Galaxy Group NGC 5813: A Window to AGN Feedback