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Fig. 10.

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2024 Swift and NICER monitoring campaign. We show the normalised 0.3–1 keV quiescent light curves of GSN 069 as obtained by the Swift XRT and by NICER during the current campaign. Any two consecutive Swift observations with consistent count rates have been combined to reduce the statistical uncertainty. Individual NICER snapshots have been analysed separately, and the data points represent the mean 0.3–1 keV flux and standard deviation obtained within a few hours. The dashed line is a sine function modulation with period ≃19.9 d and semi-amplitude ≃45% resulting in χ2 = 31 for 17 degrees of freedom.

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