The Gran Telescopio Canarias (GTC), also known as GRANTECAN, is an optical and infrared telescope and one of the largest and most advanced telescopes in the world. Located at the Roque de los Muchachos Observatory in the Canary Islands, it's designed for world-class science observations, studying topics like black holes, star and galaxy formation, and dark matter. Operated by GRANTECAN, S.A., its partners include Spain, Mexico, and the University of Florida. The GTC utilizes advanced technologies like active and adaptive optics to optimize image quality and has contributed to discoveries such as the ring system around the dwarf planet Quaoar.
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Visible-light observations of 1ES 1927+654 came from Italy’s 3.6-meter Galileo National Telescope and the 10.4-meter Gran Telescopio Canarias on La Palma in the Canary Islands.