Abstract
In order to achieve as close as possible to the ground calibration goal of approximately equals 1-2 percent for the Chandra X-ray Observatory, two high purity solid state detectors (SSDs) were used as transfer standards for measuring absolute x-ray flux. The calibration of these SSDs are based on the analysis of data obtained on various monochromatic and undispersed synchrotron beamlines at the BESSY electron storage ring in Berlin, Germany. Here we report on our updated analysis for determining the detector response function in the energy range 2.1-5.9 keV and on our recently completed analysis of the response function and detection efficiency measurements in the energy range 0.4-1.7 keV. The response function model used for spectral analysis of the data is based on the HYPERMET function, which is included in JMKmod within the XSPEC package.
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