... The 220 Mirrors of CRTF . ... Recently, astronomers with the STACEE project have begun using CRTF to collect secondary light emitted when high-energy gamma rays strike the Earth's atmosphere. Photons in this range might allow further exploration of enigmatic gamma ray burst explosions, and might be emitted when cosmic rays from supernovae impact gas clouds in the interstellar medium . ... Publications with keywords: cosmic rays - telescope - gamma ray . ... Solar Flare in the Gamma ray Sky . ...