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BlackGEM is an array of optical telescopes at La Silla Observatory (LSO) in Chile, to follow up GW detections from Virgo and LIGO. It began operation in 2023 with three telescopes of 65 cm diameter, each with a 2-square-degree field of view, the aim being to search a significant portion of the sky quickly. They carry out surveys while awaiting alerts of GW detections. Future plans are to expand to 15 such telescopes. BG4 is a term used for a planned interim-configuration of four of the telescopes.