Table 2: INTEGRAL and some previous gamma-ray experiments.
Parameter OSSE COMPTEL EGRET BATSE SIGMAc HEAO-3 INTEGRAL
Energy range 0.05-10 0.7-30 20-30 000 0.03-1.9 0.035-1.3 0.05-10 0.004-10
(MeV)             (JEM-X, SPI,
              IBIS)
Energy resolution 5-12 4-15  $\sim$20 20-32 8-16 0.2 0.16
(%)           @ 1.8 MeV @ 1.8 MeV
              (SPI)
Source position 10$^{\prime}$ 0.5$^{\circ}$ - 1$^{\circ}$ $\leq$10$^{\prime}$ 1$^{\circ}$ $\sim$1$^{\prime}$ none $\leq$1$^{\prime}$-1.5$^{\prime}$
localization             (IBIS)
Field of View $3.8^{\circ}\times11.4^{\circ}$ 1 sr 0.6 sr Earth occultation $4.7^{\circ}\times4.3^{\circ}$ $30^{\circ}\times30^{\circ}$ 16$^{\circ}$
          fully coded   fully coded
              (SPI)
Narrow line sens. $7\times10^{-5}$ $5\times10^{-5}$ n/a - $\sim$ $8\times10^{-4}$b $\sim$ $2\times10^{-4}$e $2.4\times10^{-5}$
(ph cm-2 s-1) @ 1 MeV @ 1 MeV     @ 511 keV   @ 1 MeV
(3$\sigma$, 106 s)             (SPI)
Continuum sens. $2\times10^{-7}$ $1.7\times10^{-7}$ $5\times10^{-8}$ $\sim$ $2\times10^{-3}$a $7\times10^{-6}$ $\sim$ $1\times10^{-5}$ $5\times10^{-7}$
(ph cm-2 s-1 keV-1) @ 1 MeV @ 1 MeV $\geq $100 MeV 25-35 keV @ 100 keV entire survey @ 1 MeV
(3$\sigma$, 106 s) $5\times10^{-7}$         @ 100 keVd (IBIS)
  @ 100 keV            
Years of 1991-2000 1991-2000 1991-2000 1991-2000 1989-1998 1979-1981 2002 $\rightarrow$
operation              
  • a Calculated from Shaw S. E., et al. 2001, in Exploring the Gamma-ray Universe,
    Proc. of the 4th INTEGRAL Workshop, ed. A. Giménez et al., ESA SP-459, 521.
  • b Goldwurm A., et al. 1992, ApJ, 369, 79.
  • c Paul J., et al. 1991, Adv. Space Res., 11 (8), 289.
  • d Ulmer M. P., et al. 1991, ApJ, 369, 485.
  • e Line sensitivity from http://heasarc.gsfc.nasa.gov/docs/heao3/heao3_about.html.

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