VERITAS

VERITAS (for Very Energetic Radiation Imaging Telescope Array System) is a gamma-ray telescope array, a Cherenkov telescope consisting of four 12-meter optical telescopes at Fred Lawrence Whipple Observatory, Arizona, in operation since 2007. I believe it is designed to slew sufficiently rapidly to zero in on some gamma-ray bursts. It has also been used for visible light observations including occultation observations of stars occulted by asteroids and as an optical interferometer.