Image correction in a coded mask X-ray telescope

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Abstract
A large coded mask telescope was flown on the Spacelab 2 mission in 1985. This was the first time that large amounts of data from such an instrument had been obtained and much effort was devoted to optimizing the methods of reducing detector background effects and of correcting and co-adding images. An unexpected problem was encountered in that small errors in energy calibration led to a large apparent detector background in the presence of bright sources. To provide background information for the scientific results from this instrument, and also because of their relevance to the analysis of data from other coded mask telescopes, we describe the data processing procedures adopted. They have led to an overall performance for the instrument which is close to that theoretically achievable.

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