CLASS (Cosmic Lens All-Sky Survey) and JVAS (Jodrell/VLA Astrometric Survey) are surveys of flat-spectrum radio sources designed to identify gravitational lens candidates. Suspected lenses are followed up by higher resolution VLBA and MERLIN studies. JVAS and its associated analysis was completed in 1992, leading to the discovery of five new gravitational lenses. CLASS is a much larger survey, undertaken by groups at Jodrell Bank, Caltech, the University of Pennsylvania, Dwingeloo and the University of Groningen. CLASS is in the final stages of analysis and followup of suspected lenses. These pages collect the results of observations made on the JVAS/CLASS gravitational lenses reported in the literature.
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