Fig. A.1.
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X-ray flux light curve of GRB 150309A. Top panel: XRT flux light curves at the 2 keV energy range. The light curve has been fitted with power-law and broken power-law (best fit) models. Bottom panel: Evolution of hardness ratio in the XRT energy channel. The dashed vertical red line indicates the mean value of the hardness ratio for GRB 150309A.
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