The Gravitational-wave Ultraviolet Counterpart Imager consists of two independent small satellites, each scanning the sky in a different ultraviolet band. It would detect the light from hot gas in the explosion that follows a burst of gravitational waves caused by merging neutron stars or a neutron star merging with a black hole. Between these events, the mission would map the sky in ultraviolet light, finding other bright objects such as exploding stars. Principal investigator: Stephen (Brad) Cenko.