Response Function and Count Rates with the SODART Bragg-Spectrometer

The SODART X-ray telescope includes an Objective Crystal Spectrometer (OCS) providing an energy resolving power around 1000 by Bragg reflection upon crystals. The SODART-OCS response function is used within the XSPEC package for the calculation of count rates for x-ray line and continuum registration from different classes of cosmic x-ray sources.