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The Gemini/HST Galaxy Cluster Project (GCP) covers 14 z=0.2-1.0 clusters withX-ray luminosity of L_500 >= 10^44 ergs/s in the 0.1-2.4 keV band. In thispaper we provide homogeneously calibrated X-ray luminosities, masses and radii,and we present the complete catalog of the ground-based photometry for the GCPclusters. The clusters were observed with Gemini North or South in three orfour of the optical passbands g', r', i' and z'. The photometric catalogincludes consistently calibrated total magnitudes, colors, and geometricalparameters. The photometry reaches ~25 mag in the passband closest to restframe B-band. We summarize comparisons of our photometry with data from theSloan Digital Sky Survey. We describe the sample selection for ourspectroscopic observations, and establish the calibrations to obtain rest framemagnitudes and colors. Finally, we derive the color-magnitude relations for theclusters and briefly discuss these in the context of evolution with redshift.Consistent with our results based on spectroscopic data, the color-magnituderelations support passive evolution of the red-sequence galaxies. The absenceof change in the slope with redshift, constrains the allowable age variationalong the red sequence to <0.05 dex between the brightest cluster galaxies andthose four magnitudes fainter. The paper serves as the main reference for theGCP cluster and galaxy selection, X-ray data and ground-based photometry.

The Gemini/HST galaxy cluster project: Redshift 0.2-1.0 cluster sample, X-ray data and optical photometry catalog