INTEGRAL reloaded: spacecraft, instruments and ground system
Erik Kuulkers, Carlo Ferrigno, Peter Kretschmar, Julia Alfonso-Garzon,, Marius Baab, Angela Bazzano, Guillaume Belanger, Ian Benson, Anthony J. Bird,, Enrico Bozzo, Soren Brandt, Elliott Coe, Isabel Caballero, Floriane Cangemi,, Jerome Chenevez, Bradley Cenko, Nebil Cinar

TL;DR
INTEGRAL has provided extensive gamma-ray observations since 2002, discovering new sources, detecting radioactive decay lines, and contributing to multi-messenger astronomy over 18 years of operation.
Contribution
This paper offers a comprehensive update on INTEGRAL's satellite status, instruments, and ground system after over 18 years in space, highlighting its scientific achievements.
Findings
Discovered over 600 high-energy sources.
Detected radioactive decay lines from supernovae.
Contributed to multi-messenger astronomy with neutron star merger detection.
Abstract
ESA's INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) was launched on 17 Oct 2002 at 06:41 CEST. Since then, it has been providing long, uninterrupted observations (up to about 47 hr, or 170 ksec, per satellite orbit of 2.7 days) with a large field-of-view (fully coded: 100 deg^2), msec time resolution, keV energy resolution, polarization measurements, as well as additional coverage in the optical. This is realized by two main instruments in the 15 keV to 10 MeV range, the spectrometer SPI (spectral resolution 3 keV at 1.8 MeV) and the imager IBIS (angular resolution 12 arcmin FWHM), complemented by X-ray (JEM-X; 3-35 keV) and optical (OMC; Johnson V-band) monitors. All instruments are co-aligned to simultaneously observe the target region. A particle radiation monitor (IREM) measures charged particle fluxes near the spacecraft. The Anti-coincidence subsystems of the main…
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