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It has a weak $\\gamma$-ray emission in the very early phase and followed by a bright spiky $\\gamma$-ray emission pulse. The radiation spectrum of the very early emission is best fitted by a power-law function with index $\\sim -1.7$. However, the bright spiky $\\gamma$-ray pulse, especially the time around the peak, exhibits a distinct two-component radiation spectra, i.e., Band function combined with a blackbody radiation spectrum. 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