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PHOTOSPHERE EMISSION IN THE X-RAY FLARES OF<i>SWIFT</i>GAMMA-RAY BURSTS AND IMPLICATIONS FOR THE FIREBALL PROPERTIES
X-ray flares of gamma-ray bursts (GRBs) are usually observed in the soft X-ray range and the spectral coverage is limited. In this paper, we present an analysis of 32 GRB X-ray flares that are simultaneously observed by both Burst Alert Telescope and X-Ray Telescope on board the Swift mission, so …