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The XMM Cluster Archive Super Survey (X-CLASS) is a serendipitously-detectedX-ray-selected sample of 845 galaxy clusters based on 2774 XMM archivalobservations and covering approximately 90 deg$^2$ spread across thehigh-Galactic latitude ($|b|>20$ deg) sky. The primary goal of this survey isto produce a well-selected sample of galaxy clusters on which cosmologicalanalyses can be performed. This article presents the photometric redshiftfollowup of a high signal-to-noise subset of 266 of these clusters withdeclination $\delta<+20$ deg with GROND, a seven channel ($grizJHK$)simultaneous imager on the MPG 2.2m telescope at the ESO La Silla Observatory.We use a newly developed technique based on the red sequence colour-redshiftrelation, enhanced with information coming from the X-ray detection to providephotometric redshifts for this sample. We determine photometric redshifts for236 clusters, finding a median redshift of $z=0.39$ with an accuracy of $\Deltaz = 0.02 (1+z)$ when compared to a sample of 76 spectroscopically confirmedclusters. We also compute X-ray luminosities for the entire sample and find amedian bolometric luminosity of $7.2\times10^{43} \mathrm{erg\ s^{-1}}$ and amedian temperature 2.9 keV. We compare our results to the XMM-XCS and XMM-XXLsurveys, finding good agreement in both samples. The X-CLASS catalogue isavailable online at http://xmm-lss.in2p3.fr:8080/l4sdb/.

Cosmology with XMM galaxy clusters: the X-CLASS/GROND catalogue and photometric redshifts