Fig. 1
Swift/XRT light curve of Swift J1644+57 in the 0.3–10 keV range during 2011–2012 (top panel). Here, red, blue points mark the source signal (with 2σ detection level) for PC/WT mode. Green and cyan points indicate the background level for PC/WT mode, respectively. In the bottom panel we show the hardness ratio curve (1.51–10 keV/0.3–1.5 keV) using PC mode data of Swift J1644+57.
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