Table 1: Theoretical estimations of several mission/instrument capabilities.
Mission/Instrument Area Coverage Energy band Orbit Relative
  cm2 $\%$ of $4\pi$ str. (keV) efficiency sensitivity $^{\dagger}$
SWIFT/BAT 5200 $14^{\star}$ 15 to 150 0.6 1.0
INTEGRAL/IBIS (ISGRI) 3000 $0.9^{\star}$ 15 to 150 0.8 3.0
HETE 2/WXM 360 13 2 to 25 0.5 1.0
INTEGRAL/JEM-X 1000 0.1 2 to 35 0.8 19.0
SAX/WFC 530 ($\times$2) 2 ($\times$2) 2 to 30 0.5 3.1
$\star$ Half coded field of view (FOV).
$\dagger$ Estimate based on the $P_{\rm ins} \sim \sqrt{\Omega/A}$recipe.

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