SUNNYVALE, Calif., March 10 -- NASA's Space Infrared Telescope Facility (SIRTF) has completed integration, testing and prelaunch checkout at Lockheed Martin Space Systems in Sunnyvale and has been delivered to the NASA Kennedy Space Center in Florida for an April launch. SIRTF's Cryogenic Telescope Assembly, which includes the scientific instruments, was built by Ball Aerospace in Boulder, Colo., and was delivered to Space Systems in Sunnyvale in February and integrated with the Lockheed Martin-built spacecraft. 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