Fermi Gamma-ray Space Telescope

GBM Specifications & Performance

Quantity GBM (Minimum Spec.) BATSE
Energy Range < 10 keV - > 25 MeV 25 keV - 10 MeV
Field of View all sky not
occulted by the Earth		 4π sr
Energy Resolution1 < 10% < 10%
Deadtime per Event < 15 μs  
Burst Sensitivity2 < 0.5 cm-2 s-1 0.2 cm-2 s-1
Alert GRB Location3 ~ 15° ~ 25°
Final GRB Location4 ~ 3° 1.7°

1 1-σ, 0.1 - 1 MeV
2 50 - 300 keV
3 Calculated on-board; 1 second burst of 10 photons cm-2 s-1, 50 - 300 keV
4 Final ground computed locations; 1 second burst of 10 photons cm-2 s-1, 50 - 300 keV