The conversation between human and AI assistant.
[|Human|] What is the CGRO that detects photons?
[|AI|] The CGRO is the Compton Gamma Ray Observatory (CGRO) and was a space observatory detecting photons with energies from 20 keV to 30GeV in earth from 1991 to 2000.
[|Human|] 
What is the CGRO that detects photons?