Integral was a European Space Agency mission that was active between 17 October 2002 and 28th February 2025.
It functioned in a highly elliptical orbit with observations of ~50 h possible. The four onboard instruments were SPI, a gamma-ray spectrograph (18 ke V – 8 MeV) with a resolution of E/deltaE = 500 and a spatial resolution of ~2.5°. It was sensitive down to 8.8e-4 ph/(s cm2 MeV) [3σ in 1e6 s at1 MeV].
IBIS had a spatial resolution of 12 arcmin FWHM and functioned from 15 keV to 10 MeV down to ~1e-6 ph/(s cm2 keV) in a 29.1° x 29.4° FoV. It had a time resolution of 61 microseconds.
JEM-X functioned in the 3-35 keV band with a spectral resolution of 1.3 keV. It was sensitive to 1.2e-4 ph/(cm2 s keV) [3σ in 1e5 s at 6 keV] with an angular resolution of 3’ (FWHM). It had a 7.5° FoV and a 1 ms absolute timing capability.
The Optical Monitoring Camera (OMC) had a FoV of 4.979° x 4.979° and observed in the V-band down to a limiting magnitude of ~19th magnitude. It had a time resolution of 3s.