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Published online by Cambridge University Press: 25 April 2016
This paper presents results from a series of rocket flights which have yielded the first unambiguous evidence for the variability of a cosmic X-ray source. The evidence rests primarily on three flights, the first two of which were conducted from Woomera by a joint Universities of Adelaide and Tasmania (UAT) team, and the third from Hawaii by the Lawrence Radiation Laboratories (LRL) of California. Data from two additional flights, one by LRL and the other by the University of Leicester, support this evidence.