Julie E. McEnery NASA Goddard Space Flight Ctr. (United States) Peter F. Michelson Stanford Univ. (United States) William S. Paciesas The Univ. of Alabama in Huntsville (United States) Steven Ritz Univ. of California, Santa Cruz (United States)
The Fermi Gamma-ray Space Telescope, launched in June 2008, is an observatory designed to survey the high-energy gamma-ray sky. The primary instrument, the Large Area Telescope (LAT), provides observations from 20 MeV to greater than 300 GeV. A second instrument, the Gamma-ray Burst Monitor (GBM), provides observations of transients from less than 10 keV to 40 MeV. We describe the design and performance of the instruments and their subsystems, the spacecraft and the ground system.