A NASA satellite launched in April 1991 by the space shuttle Atlantis to observe the high-energy Universe. Named after the American physicist Arthur H. Compton, it was the second of NASA's series of four ‘Great Observatories’. It had four instruments larger and more sensitive than any previous orbiting gamma-ray telescopes. They were the Imaging Compton Telescope (COMPTEL), the Energetic Gamma-ray Experiment Telescope (EGRET), the Oriented Scintillation Spectrometer Experiment (OSSE), and the Burst and Transient Source Experiment (BATSE). The instruments investigated solar flares, gamma-ray bursts, pulsars, quasar emissions, nova and supernova explosions, black holes, and interactions of cosmic radiation with interstellar matter. The observatory was commanded to burn up in the atmosphere over the Pacific Ocean on 4 June 2000.

https://heasarc.gsfc.nasa.gov/docs/cgro/index.html Dedicated to the nine-year mission of the Compton Gamma-Ray Observatory, outlining its objectives and providing information on the spacecraft's scientific instruments and results. Among the many resources are images and links to other gamma-ray astronomy sites.