Fig. 4.
DCF cross-correlations of light curves (from top to bottom panel): FACT with Swift/BAT, MAXI, Swift/XRT (2–10 keV), Swift/XRT (0.3–2 keV). One-day binning was used. Left: DCF values as a function of lag. Grey error bars denote 1σ uncertainties. Right: lag distributions derived from FR/RSS simulations (more details are provided in Sect. 3.2). A Gaussian fit (black lines) was used to derive the lag indicated on the plots.
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