Instrument | Institute | |
| Low-Energy Imaging Telescope(LE) | Laboratory for Space Research (Leiden) | |
| Mullard Space Science Laboratory (UCL, London) | |
| Space Research Laboratory (Utrecht) |
| Medium-Energy Instrument (ME) | University of Leicester | |
| Max Planck Institute (Garching) | |
| University of Tubingen |
| Gas Scintillation Proportional counter (GSPC) | ESA/SSD | |
| MSSL | |
| University of Palermo | |
| University of Milan | |
