On-board Instruments

Following the scientific requirements described before, The baseline Instrument suite configuration of THEUS payload includes 5 lobster-eye modules (F=300mm), a 70cm class IR telescope and a set of hard 25 X-ray / soft gamma-ray detectors based on Si+CsI(Tl) coupling technology covering the total FOV of the lobster-eye modules. In summary, the scientific payload of THESEUS will be composed by:

  • Soft X-ray Imager (SXI): a set of 4 « Lobster-Eye » X-ray (0.3 - 6 keV) telescopes covering a total FOV of 0.1 sr field with 0.5 – 1 arcmin source location accuracy, provided by a UK led consortium;

  • InfraRed Telescope (IRT): a 70 cm class near-infrared (up to 2 microns) telescope with imaging and moderate spectral capabilities provided by a France led consortium (+ ESA, Swiss and German);

  • X-Gamma-rays Imaging Spectrometer (XGIS): spectrometer based on 4 detection units based on SDD+CsI(Tl) modules (2 keV – 20 MeV) , covering twice the FOV of the SXI. This instrument will be provided by an Italian led consortium (+Spain);

All the Instrument shall be equipped by an: Instrument Data Handling Unit (I-DHU): interfacing each of the three instruments with spacecraft. Provided by a German led consortium (+ Poland).