The Danish experiment WATCH (Wide Angle Telescope for Cosmic Hard X-rays) is to be flown on board the Soviet satellite GRANAT in middle of 1989. The performance characteristics of the WATCH instrument is described. It is estimated that WATCH can detect about 100 solar hard X-ray bursts per day. WATCH can also detect about 40 energetic stellar soft X-ray flares, similar to the fast transient X-ray emissions detected by the Ariel V satellite.
Solar and Stellar Flares: Proceedings of the 104th Colloquium of the International Astronomical Union Held in Stanford, California, August 15–19, 1988, 1989, p. 33-36
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104th IAU Colloquium on Solar and Stellar Flares, 1989