FERMI is a high-energy gamma-ray mission, operating at energies 30MeV-300GeV (LAT) and 8keV-1MeV (GBM). It has two main instuments – LAT (Large Area Telescope) and GBM (Gamma-ray Burst Monitor). The FoV is $\approx 0.2$ entire sky and the whole sky is seen in 3days of operation. The FERMI data is publically available from August,4,2008 up to the current date.
Official website
LAT specifications
GBM specifications