Abstract
Future programs of x-ray astronomy in Japan are described. Following the Hakucho satellite, ASTRO-B and ASTRO-C are under preparation. ASTRO-B, to be launched in early 1983, is designed for the study of x-ray spectra and variability of x-ray sources. It is equipped with gas scintillation proportional counters of total area 1000 cm2, one dimensional x-ray focusing collectors, transient source monitors and a gamma-ray burst monitor. ASTRO-C will be launched in 1987 to study the time variability of cosmic x-ray sources with high statistical accuracies. The main emphasis is placed not only on the accurate timing analysis of the galactic sources but on the investigation of the time variability of active galactic nuclei. This satellite will be equipped with large area, low background proportional counters of total area of about 5000 cm2, an all sky monitor and a gamma-ray burst detector.
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