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We propose a novel method of identifying supermassive binary black holes by means of reverberation mapping their circumbinary disk after a tidal disruption has ionized it.The tidal disruption of a star at the secondary leads to strong asymmetries in the disk response.We model the shape of velocity–delay maps for various toy disk models and more realistic gas distributions obtained by SPH simulations.The emissivity of the ionized disk is calculated with Cloudy.We find peculiar asymmetries in the maps for off center ionizing sources that may help us constrain geometrical parameters of a circumbinary disk such as semimajor axis and orbital phase of the secondary,as well as help strengthen the observational evidence for sub-parsec SMBBHs as such.