ISGRI: the INTEGRAL Soft Gamma-Ray Imager

Abstract

For the first time in the history of high energy astronomy, a large CdTe gamma-ray camera is operating in space. ISGRI is the low-energy camera of the IBIS telescope on board the INTEGRAL satellite. This paper details its design and its in-flight behavior and performances. Having a sensitive area of 2621 cm${}^2$ with a spatial resolution of 4.6 mm, a low threshold around 12 keV and an energy resolution of $\sim$ 8% at 60 keV, ISGRI shows absolutely no signs of degradation after 9 months in orbit. All aspects of its in-flight behavior and scientific performance are fully nominal, and in particular the observed background level confirms the expected sensitivity of 1 milliCrab for a 10${}^6$s observation.

INTEGRAL A&A special issue

References in corpus (5)

• The INTEGRAL/IBIS Scientific Data Analysis
• In flight calibration of the ISGRI camera
• IBIS preliminary results on Cygnus X-1 spectral and temporal characteristics
• First results of IBIS/ISGRI Cygnus X-3 monitoring during INTEGRAL PV phase
• First observations of the X-ray transient EXO 2030+375 with IBIS/ISGRI

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• An INTEGRAL Hard X-ray Survey of the Large Magellanic Cloud
• RX J0440.9+4431: another supercritical X-ray pulsar
• A Short Hard X-ray Flare from the Blazar NRAO 530 Observed by INTEGRAL
• Observations of Supergiant Fast X-ray Transients with LOFT
• Unveiling the nature of IGR J17177-3656 with X-ray, NIR and Radio observations
• IGR J17451-3022: a dipping and eclipsing low mass X-ray binary
• The longest observation of a low intensity state from a Supergiant Fast X-ray Transient: Suzaku observes IGRJ08408-4503
• Hard X-ray emission and ${}^{44}$Ti line features of Tycho Supernova Remnant
• A large spin-up rate measured with INTEGRAL in the High Mass X-ray Binary Pulsar SAXJ2103.5+4545
• Searching for gamma-ray blazar candidates among the unidentified INTEGRAL sources
• Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
• AX J1910.7+0917 and three newly discovered INTEGRAL sources
• Constraints on the luminosity of the stellar remnant in SNR1987A
• XMM-Newton and INTEGRAL observations of the very faint X-ray transient IGRJ17285-2922/XTEJ1728-295 during the 2010 outburst
• Is the INTEGRAL/IBIS source IGR J17204-3554 a gamma-ray emitting galaxy hidden behind the molecular cloud NGC 6334 ?
• Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst
• The changing look of PKS 2149-306
• Long-term Hard X-ray Monitoring of 2S 0114+65 with INTEGRAL/IBIS
• A magnetic white-dwarf accretion model for the anomalous X-ray pulsar 4U 0142+61
• Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole
• Properties of the Obscuring Torus in NGC 1052 from Multi-epoch Broadband X-ray Spectroscopy
• Puzzling thermonuclear burst behaviour from the transient low-mass X-ray binary IGR J17473-2721
• 15 years of Galactic surveys and hard X-ray Background measurements
• INTEGRAL high energy behaviour of 4U 1812-12
• INTEGRAL and Swift observations of the supergiant fast X-ray transient AXJ1845.0-0433=IGRJ18450-0435
• The INTEGRAL view of the pulsating hard X-ray sky: from accreting and transitional millisecond pulsars to rotation-powered pulsars and magnetars
• Probing the Transition Between the Synchrotron and Inverse-compton Spectral Components of 1ES 1959+650
• Unveiling Soft Gamma-Ray Repeaters with INTEGRAL
• An XMM-Newton and INTEGRAL view on the hard state of EXO 1745-248 during its 2015 outburst
• Swift J1734.5-3027: a new long type-I X-ray bursting source
• Peculiar X-ray transient SRGA J043520.9+552226/AT2019wey discovered with SRG/ART-XC
• Long-Term INTEGRAL and RXTE Observations of the X-Ray Pulsar LMC X-4
• Chandra-HETGS Characterization of an Outflowing Wind in the accreting millisecond pulsar IGR J17591-2342
• Staring at 4U 1909+07 with Suzaku
• Spin and Spectral Variations of Peculiar High-Mass X-ray Binary 4U 2206+54
• Expected number of supergiant fast X-ray transients in the Milky Way
• The 2015 outburst of the accreting millisecond pulsar IGR J17511-3057 as seen by INTEGRAL, Swift and XMM-Newton
• INTEGRAL, XMM-Newton and ESO/NTT identification of AX J1749.1-2733: an obscured and probably distant Be/X-ray binary
• Spectral evolution of bright NS LMXBs with INTEGRAL: an application of the thermal plus bulk Comptonization model
• The first multi-wavelength campaign of AXP 4U 0142+61 from radio to hard X-rays
• Exploring the spreading layer of GX 9+9 using RXTE and INTEGRAL
• The broadband spectral analysis of 4U 1702-429 using XMM-Newton and BeppoSAX data
• Variability of the symbiotic X-ray binary GX 1+4: Enhanced activity near periastron passage
• New orbital ephemerides for the dipping source 4U 1323-619: constraining the distance to the source
• Quasi-periodic flares in EXO 2030+375 observed with INTEGRAL
• Orbital X-ray modulation study of three Supergiant HMXBs
• INTEGRAL observation of the accreting pulsar 1E1145.1-6141
• First results of IBIS/ISGRI Cygnus X-3 monitoring during INTEGRAL PV phase
• Swift, INTEGRAL, RXTE, and Spitzer reveal IGR J16283-4838
• Simultaneous multiwavelength observations of V404 Cygni during its 2015 June outburst decay strengthen the case for an extremely energetic jet-base
• Glimpse of the highly obscured HMXB IGR J16318-4848 with Hitomi
• Spectral and temporal properties of the supergiant fast X-ray transient IGR J18483-0311 observed by INTEGRAL
• GRB021125: the first GRB imaged by INTEGRAL
• Observations of Cygnus X-1 in the MeV band by the INTEGRAL imager
• X-Ray Observations of SN 1006 with Integral
• Anti-correlated Soft Lags in the Intermediate State of Black Hole Source GX 339-4
• An online data analysis system of INTEGRAL telescope
• Hard X-ray/Soft gamma-ray experiments and missions: overview and prospects
• Investigating the EGRET-radio galaxies link with INTEGRAL: the case of 3EG J1621+8203 and NGC 6251
• The multi-outburst activity of the magnetar in Westerlund I
• INTEGRAL Observations of the Perseus cluster
• Discovery of X-ray Pulsations from the HMXB Source AXJ1749.1-2733
• Influence of Compton scattering on the broad-band X-ray spectra of intermediate polars
• The Fermi-GBM X-ray burst monitor: thermonuclear bursts from 4U 0614+09
• Variations and Correlations in Cyclotron Resonant Scattering Features of Vela X-1 Studied by INTEGRAL
• Confirming the thermal Comptonization model for black hole X-ray emission in the low-hard state
• The efficient low-mass Seyfert MCG-05-23-016
• The discovery of hard X-ray emission in the persistent flux of the Rapid Burster
• INTEGRAL/IBIS observations of a hard X-ray outburst in high mass X-ray binary 4U 2206+54
• Unveiling the hard X-ray spectrum from the "burst-only" source SAX J1753.5-2349 in outburst
• Infrared identification of IGR J09026-4812 as a Seyfert 1 galaxy
• INTEGRAL and XMM-Newton Observations of GRB040106
• Bursting behavior of the Galactic Center faint X-ray transient GRS 1741.9-2853
• The nature of the multi-wavelength emission of 3C 111
• Detection and analysis of a new INTEGRAL hard X-ray transient, IGR J17285-2922
• Chasing candidate Supergiant Fast X-ray Transients in the 1,000 orbits INTEGRAL/IBIS catalog
• Multi-messenger astronomy with INTEGRAL
• INTEGRAL discovery of a high-energy tail in the microquasar Cygnus X-3
• X-ray and Near Infrared observations of the obscured accreting pulsar IGR J18179-1621
• The ultra-compact binary 4U1850-087 observed with INTEGRAL: hard X-ray emission from an X-ray burster
• GRB030406 an extremely hard burst outside of the INTEGRAL field of view
• Is 4U 0114+65 an eclipsing HMXB?
• Broadband X-ray spectrum of XTE J1550-564 during 2003 outburst
• Broadband Observations of the Transient X-ray Pulsar SAX J2103.5+4545
• The ISGRI CdTe gamma camera In-flight behavior
• Spectral evolution of the supergiant HMXB IGR J16320-4751 along its orbit using XMM-Newton
• Progressive steepening of the SNR RX J1713.7-3946 X-ray spectrum from XMM-Newton to INTEGRAL
• IGR J17445-2747 - yet another X-ray burster in the Galactic bulge
• Sgr B2 hard X-ray emission with INTEGRAL after 2009: still detectable?
• Discovery of a magnetic neutron star in X-ray transient IGR J01583+6713
• An X-ray view of the INTEGRAL/IBIS blazars
• Extending the baseline for SMC X-1's spin and orbital behavior with NuSTAR stray light
• Out of the darkness: the infrared afterglow of the INTEGRAL burst GRB 040422 observed with the VLT
• INTEGRAL serendipitous detection of the gamma-ray microquasar LS 5039
• The coronal temperature of NGC 4388 and NGC 2110 measured with INTEGRAL
• INTEGRAL and Swift observations of IGRJ19294+1816 in outburst
• INTEGRAL/IBIS polarization detection in the hard and soft intermediate states of Swift J1727.8-1613
• X-ray nova MAXI J1828-249. Evolution of the broadband spectrum during its 2013-2014 outburst
• First Results from the IBIS/ISGRI Data Obtained During the Galactic Plane Scan. II. The Vela Region
• RT Cru: a look into the X-ray emission of a peculiar symbiotic star
• First broad band study of the mysterious source 1E 1743.1-2843
• INTEGRAL observations of the gamma-ray binary 1FGL J1018.6-5856
• GRB 021219: the first Gamma-Ray Burst localized in real time with IBAS
• INTEGRAL/IBIS search for e-e+ annihilation radiation from the Galactic Center Region
• Broad-band X-ray spectra and timing of the accretion-powered millisecond pulsar Swift J1756.9$-$2508 during its 2018 and 2019 outbursts
• INTEGRAL-ISGRI observations of the CygOB2 region: earching for hard X-ray point sources in a region containing several non-thermal emitting massive stars
• Broad-band X-ray spectra of anomalous X-ray pulsars and soft $\gamma$-ray repeaters: pulsars in a weak-accretion regime ?
• Investigating the nature of INTEGRAL Gamma-ray Bursts and sub-threshold triggers with Swift follow up
• X-ray, optical and infrared investigation of the candidate Supergiant Fast X-ray Transient IGR J18462-0223
• INTEGRAL observations of the GeV blazar PKS1502+106 and of the hard X-ray bright Seyfert Galaxy Mkn841
• Swift-BAT hard X-ray sky monitoring unveils the orbital period of the HMXB IGR J18219-1347
• High energy properties of PKS 1830-211
• Cosmic gamma-ray burst 060428C detected in the fields of view of the IBIS and SPI telescopes of the INTEGRAL observatory and its early afterglow
• The magnetar candidate AX J1818.8-1559
• Temporal Variations And Spectral Properties of Be/X-ray Pulsar GRO J1008-57 Studied by INTEGRAL
• Hard X-ray emission cutoff in anomalous X-ray pulsar 4U 0142+61 detected by INTEGRAL
• The peculiar high-mass X-ray binary 1ES 1210-646
• New insights into the quasi-periodic X-ray burster GS 0836-429
• A faint outburst of the accreting millisecond X-ray pulsar SAX J1748.9-2021 in NGC 6440
• The Orbital Parameters of the Eclipsing High-Mass X-ray Binary Pulsar IGR J16493-4348 from Pulsar Timing
• New Gamma-Ray Bursts Found in the Archival Data from the IBIS/ISGRI Telescope of the INTEGRAL Observatory
• Distinct accretion modes of Cygnus X-1 revealed from hard X-rays
• Accretion disc by Roche lobe overflow in the supergiant fast X-ray transient IGR J08408-4503
• The outburst of the X-ray nova GRS 1739-278 in September, 2016
• INTEGRAL discovery of unusually long broad-band X-ray activity from the Supergiant Fast X-ray Transient IGR J18483-0311
• Broadband Suzaku observations of IGR J16207-5129
• Serpens X-1 observed by INTEGRAL
• Study of the Fast X-Ray Transient XTE J1901+014 Based on INTEGRAL, RXTE and ROSAT Data
• Cygnus X-3 transition from the ultrasoft to the hard state
• Systematic effects induced on IBIS detectors by background and inhomogeneity of the spatial response
• IBIS performances during the Galactic Plane Scan - I. The Cygnus region
• Contrasting behaviour from two Be/X-ray binary pulsars: insights into differing neutron star accretion modes
• IGR J17503-2636: a candidate supergiant fast X-ray transient
• The 54 days orbital period of AX J1820.5-1434 unveiled by Swift
• Rapid spectral transition of the black hole binary V404 Cyg
• A new determination of the INTEGRAL/IBIS point source location accuracy
• First INTEGRAL Observations of Eight Persistent Neutron Star Low Mass X-ray Binaries
• INTEGRAL observation of 3EG J1736-2908
• The environment of the wind-wind collision region of $\eta$ Carinae
• Spectroscopic study of the optical counterpart to the Fast X-ray Transient IGR J17544-2619 based on observations at the 1.5-m RTT-150 telescope
• Phase-resolved hard X-ray emission of the high-mass binary LS 5039: a spectral hardening above 50 keV detected with INTEGRAL
• INTEGRAL & RXTE Power Spectra of Cygnus X-1
• G0.57-0.018: A young supernova remnant? INTEGRAL and VLA observations
• XTE J1906+090: a persistent low luminosity Be X-ray Binary
• New fast X-ray transient IGR J18462-0223 discovered by the INTEGRAL observatory
• Dust-scattering halo and giant hard X-ray flare from the Supergiant Fast X-ray Transient IGR J16479-4514 investigated with XMM-Newton and INTEGRAL
• IGRJ18179-1621: An obscured X-ray pulsar discovered by INTEGRAL
• Are binary black hole mergers and long gamma-ray bursts drawn from the same black hole population?
• GRB 190919B: Rapid optical rise explained as a flaring activity
• INTEGRAL serendipitous observations of solar and terrestrial X-rays and gamma rays
• Development of a modular CdTe detector plane for gamma-ray burst detection below 100 keV
• In-depth study of long-term variability in the X-ray emission of the Be/X-ray binary system AX J0049.4-7323
• INTEGRAL and Swift observations of the hard X-ray transient MAXI J1828-249
• High-Energy pulse profile of the Transient X-ray Pulsar SAX J2103.5+4545
• The catalog of variable sources detected by INTEGRAL I: Catalog and Techniques
• Swift discovery of the orbital period of the HMXB IGR J015712-7259 in the Small Magellanic Cloud
• GRB 040403: a faint X-ray rich Gamma-ray Burst discovered by INTEGRAL
• Swift, RXTE, and INTEGRAL observation of Swift J1922.7-1716
• INTEGRAL detection of hard X-rays from NGC 6334: Nonthermal emission from colliding winds or an AGN?
• On the nature of the hard X-ray source IGR J2018+4043
• First hard X-ray detection and broad band X-ray study of the unidentified transient AX J1949.8+2534
• To understand the X-ray spectrum of anomalous X-ray pulsars and soft gamma-ray repeaters
• Swift unveils the orbital period of IGR J18214-1318
• ProtoEXIST: Advanced Prototype CZT Coded Aperture Telescopes for EXIST
• Coded Mask Instruments for Gamma-Ray Astronomy
• Investigating the nature of IGR J17454-2919 using X-ray and Near-Infrared observations
• Synthesis of radioactive elements in novae and supernovae and their use as a diagnostic tool
• Tandem Swift and INTEGRAL Data to Revisit the Orbital and Superorbital Periods of 1E 1740.7-2942
• Stellar wind structures in the eclipsing binary system IGR J18027-2016
• No apparent accretion mode changes detected in Cen X-3
• 20 years of disk winds in 4U 1630-47 -- I. Long-term behavior and influence of hard X-rays
• NuSTAR spectral analysis beyond 79 keV with stray light
• INTEGRAL and Swift/XRT observations of the source PKS 0208-512
• Broad-band X-ray spectral and timing properties of the accreting millisecond X-ray pulsar IGR J17498$-$2921 during the 2023 outburst
• Exploring the MeV Sky with a Combined Coded Mask and Compton Telescope: The Galactic Explorer with a Coded Aperture Mask Compton Telescope (GECCO)
• High-energy emission from NGC 5506, the brightest hard X-ray Narrow Line Seyfert 1 galaxy
• Discovery and Identification of MAXI J1621-501 as a Type I X-ray Burster with a Super-Orbital Period
• Investigating the Optical Counterpart Candidates of Four INTEGRAL Sources localized with Chandra
• The failed state transition of the ATOLL source GRS 1724-308
• The hard X-ray view of bright infrared galaxies
• First observations of the X-ray transient EXO 2030+375 with IBIS/ISGRI
• Discovery of two new Fast X-ray Transients with INTEGRAL: IGR J03346+4414 and IGR J20344+3913
• The properties of the Galactic Hard X-Ray and soft gamma-ray Background based on 20 years of INTEGRAL/IBIS observations
• Designing large pixelated CdTe detection planes for hard X-ray transients detection
• Search for Nonthermal X-ray Emission in the Ophiuchus Galaxy Cluster
• INTEGRAL and Swift/XRT observations of IGR~J16460+0849
• The broad-band spectrum of Cyg X-2 with INTEGRAL
• Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14
• Modeling the flaring activity of the high z, hard X-ray selected blazar IGR J22517+2217
• First IBIS results on the high energy emission of Cyg X-2
• A multifrequency characterization of the extragalactic hard X-ray sky
• High-energy observations of black hole binaries with the INTEGRAL satellite
• A magnetar giant flare in the nearby starburst galaxy M82
• INTEGRAL and Swift/XRT observations of IGR J19405-3016
• Development of the cadmium zinc TElluride Radiation Imager (TERI)
• In-flight calibration of the INTEGRAL/IBIS Compton mode: Application to the Crab Nebula polarization
• Deeply x-raying the high-energy sky
• Search for Astrophysical Transients on Limiting Time Scales and Their Classification Based on INTEGRAL Data
• ISINA: INTEGRAL Source Identification Network Algorithm
• Unprecedentedly bright X-ray flaring in Cygnus X-1 observed by INTEGRAL
• GOLIA: an INTEGRAL archive at INAF-IASF Milano
• Hard X-ray colours of Neutron Star and Black Hole Low Mass X-ray Binaries with INTEGRAL
• Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter
• The spectral catalogue of INTEGRAL gamma-ray bursts: results of the joint IBIS/SPI spectral analysis
• INTEGRAL limits on past high-energy activity from FRB 20200120E in M81
• New approaches for faint source detection in hard X-ray surveys
• Deep Hard X-ray Survey of the M81 Field Based on INTEGRAL Data
• The INTEGRAL - HESS/MAGIC connection: a new class of cosmic high energy accelerators from keV to TeV
• On the behavior of the black hole candidate 1E 1740.7-2942's corona based on long-term INTEGRAL database