Upper panel: historical flux light curve in the 0.2–2 keV for GSN 069. The Swift data are shown in blue squares, while XMM data are shown in green. The new data (after 2013) that have not been presented in M13 are highlighted in red circles. We also plotted the upper limits (downward arrows) from ROSAT observations. Lower panel: the evolution of the Swift count rates in the 0.2–2 keV. The best-fitting model with a ﹩{(t-{t}_{D})}^{-5/12}﹩, ﹩{(t-{t}_{D})}^{-19/16}﹩, and ﹩{(t-{t}_{D})}^{-5/3}﹩ decay law is shown in red dashed, black dotted and solid line, where ﹩{t}_{D}\simeq 0.68,3.29﹩ and 5.62 in units of years before 2010 July 14, respectively.