An international gamma-ray observatory launched in 2008 June, a successor to the Compton Gamma Ray Observatory; the partners are NASA, the US Department of Energy, France, Germany, Japan, Italy, and Sweden. Fermi carries two instruments: the Large Area Telescope (LAT), which maps the gamma-ray sky at energies from 20 MeV to more than 300 GeV; and the GLAST Burst Monitor (GBM), which detects gamma-ray bursts at energies from 8 keV to 30 MeV. The GBM’s field of view covers the entire sky not obscured by the Earth.
http://fermi.gsfc.nasa.gov/ Official mission website.
http://www.nasa.gov/mission_pages/GLAST/spacecraft/index.html NASA mission page.