Soft X-ray response of a CCD with a grating spectrometer

We calibrate the X-ray imaging spectrometers, which are CCD cameras install ed on the ASTRO-E satellite, by using dispersed continuous soft X-rays from a grating spectrometer. We obtained the signal-pulse height and energy-res olution as a function of X-ray energies continuously. However, the wings of the line spread function of the grating distorts the center of the signal- pulse height derived by a simple analysis. An estimation of this distortion is presented. We also describe two methods of extracting the pure signal-p ulse-height distribution from the data using the spectrometer. A brief desc ription of the low-energy tail is presented. (C) 1999 Elsevier Science B.V. All rights reserved.