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GRB 200612A could be classified as an ultralong gamma-ray burst due to its prompt emission lasting up to～1020 s and the true timescale of the central engine activity tburst≥ 4 ×104 s. The late X-ray light curve with a decay index of α=7.53 is steeper than the steepest possible decay from an external shock model.We propose that this X-ray afterglow can be driven by dipolar radiation from the magnetar spindown during its early stage,while the magnetar collapsed into the black... 相似文献
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