Normal incidence x-ray telescope. Semiannual progress report, 1 May 1985-31 October 1986

The postflight performance evaluation of the x-ray telescope was summarized. All payload systems and subsystems performed well within acceptable limits, with the sole exception of the light-blocking prefilters. Launch, flight and recovery were performed in a fully satisfactory manner. The payload was recovered in a timely manner and in excellent condition. The prefilter performance analysis showed that no x-ray images were detected on the processed flight film. Recommendations for improved performance are listed