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Published online by Cambridge University Press: 04 August 2017
The galactic x-ray source Circinus X-1 is notable for its periodic flares at x-ray, optical, infrared and radio wavelengths. The flares recur at 16.6 day intervals, but there is considerable variability from one cycle to another. (See Dower et al, 1982, and references therein for a detailed review of the properties of Circinus X-1).