When it left Earth in the spring of 1991, the Compton payload was the heaviest in American spaceflight. It was number two in order of launch for NASA's Great Observatories. It probably would have lasted longer in its data-gathering life had one of its three gyroscopes not failed. It was sensitive from 30 keV to 30 GeV.
https://heasarc.gsfc.nasa.gov/docs/cgro ... index.html
https://www.daviddarling.info/encyclope ... atory.html
CGRO on stamps:
The workings of the Universe.
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