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GRB 130925A: an ultralong gamma ray burst with a dust-echo afterglow, and implications for the origin of the ultralong GRBs
GRB 130925A was an unusual gamma ray burst (GRB), consisting of three distinct episodes of high-energy emission spanning ā¼20 ks, making it a member of the proposed category of āultralongā bursts. It was also unusual in that its late-time X-ray emission observed by Swift was very soft, and showed a ā¦