Fig. 5
Swift X-ray and light-curves in seconds since the start of the first Swift observation: 2013 Aug. 10 at 23:16 UT = MJD 56 514.97. V751 Cyg was around half a magnitude brighter in late 2013 August than in mid August, while the X-ray flux remained essentially unchanged. In the text, the observations around 3 10 s are referred to as “early”, while the data after 10 s are “late”.
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