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The Optical Monitor Catalogue of serendipitous sources (OMCat) containsentries for every source detected in the publicly available XMM-Newton OpticalMonitor (OM) images taken in either the imaging or ``fast'' modes. Since the OMis coaligned and records data simultaneously with the X-ray telescopes onXMM-Newton, it typically produces images in one or more near-UV/optical bandsfor every pointing of the observatory. As of the beginning of 2006, the publicarchive had covered roughly 0.5% of the sky in 2950 fields.  The OMCat is not dominated by sources previously undetected at otherwavelengths; the bulk of objects have optical counterparts. However, the OMCatcan be used to extend optical or X-ray spectral energy distributions for knownobjects into the ultraviolet, to study at higher angular resolution objectsdetected with GALEX, or to find high-Galactic-latitude objects of interest forUV spectroscopy.

OMCat: Catalogue of Serendipitous Sources Detected with the XMM-Newton Optical Monitor