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To understand structure formation in the universe and impose strongerconstraints on the cluster mass function and cosmological models, it isimportant to have large galaxy cluster catalogs. The Swift AGN and ClusterSurvey is a serendipitous X-ray survey aimed at building a large statisticallyselected X-ray cluster catalog with 442 cluster candidates in its firstrelease. Our initial SDSS follow-up study confirmed $50\%$ of clusters in theSDSS footprint as z $<$ 0.5 clusters. Here, we present further opticalfollow-up analysis of 248 (out of 442) cluster candidates from the Swiftcluster catalog using multi-band imaging from the MDM $2.4m$ telescope and thePan-STARRS survey. We report the optical confirmation of 55 clusters with $>3\sigma$ galaxy overdensities and detectable red sequences in thecolor-magnitude space. The majority of these confirmed clusters have redshiftsz $<$ 0.6. The remaining candidates are potentially higher redshift clustersthat are excellent targets for infrared observations. We report the X-rayluminosity and the optical richness for these confirmed clusters. We alsodiscuss the distinction between X-ray and optical observables for the detectedand non-detected cluster candidates.

Optical Confirmation of X-ray selected Galaxy clusters from the Swift AGN and Cluster survey with MDM and Pan-STARRS Data (Paper III)