The Compton Gamma Ray Observatory was a space observatory detecting photons with energies from 20 keV to 30 GeV, in Earth orbit from 1991 to 2000. The observatory featured four main telescopes in one
CGRO deployed in 1991
Launch of Space Shuttle Atlantis carrying the observatory to Earth orbit (STS-37)
Astronaut Jay Apt in the Space Shuttle bay with the observatory partially deployed but still attached to the Shuttle's robotic arm
Compton Gamma Ray Observatory cutaway
Neil Gehrels Swift Observatory, previously called the Swift Gamma-Ray Burst Explorer, is a NASA three-instrument space observatory for studying gamma-ray bursts and monitoring the afterglow in X-ray a
Compton Gamma Ray Observatory
…Agency and various universities, as well as the U.S. Naval Research Laboratory. Successors to CGRO include the ESA INTEGRAL spacecraft (2002–2025), NASA Swift Gamma-Ray Burst Mission (launched 2004), ASI AGILE (2007–2024) and NASA Fermi Gamma-ray Space Telescope (launched 2008); Swift and Fermi remain operational as of August 2025…
Diagram of Burst Alert Telescope
Swift before launch
UVOT's "first light" image
A model of the satellite