INTEGRAL is an ESA mission, built in collaboration with Russia (responsible for the launcher) and USA (that contributed the Deep Space Network). INTEGRAL is the first space observatory made to observe the sky in the gamma ray, X and visible windows.
IBIS, the imaging instrument onboard, was designed to provide to the scientific community a combination of wide field imaging capacity in high energy, multiband spettroscopy, and high resoultion timing capacity in X and gamma ray.