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Published online by Cambridge University Press: 12 April 2016
Sco X-1 is known to show periods of correlated X-ray and optical activity on a timescale of minutes to days, see e.g. Ilovaisky et al.,1980. The rapid optical variations show typically an amplitude of about 5%. During the 1979 campaign on Sco X-1, blue band observations were obtained on several nights with the ESO 1 m photometric telescope with a time resolution of 2 seconds.