The Compton Gamma Ray Observatory: Mission status

Abstract
The Arthur Holly Compton Gamma Ray Observatory (Compton) is the second in NASA’s series of Great Observatories. Compton has now been operating for over two and a half years, and has given us a dramatic increase in capability over previous gamma‐ray missions. The spacecraft and scientific instruments are all in good health, and many significant discoveries have already been made and continue to be made. We describe the capabilities of the four scientific instruments, and the observing programs for the first three years of the mission. During Phases 2 and 3 of the mission of Guest Investigator program has been in progress with the Guest Observers’ time share increasing from 30% to over 50% for the later mission phases.

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