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2. GRANAT/SIGMA observation of GRB 920723 soft gamma-ray afterglow
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4. Costa, E., etal 1998, in AIP Conf. Proc. 428, Fourth Huntsville Symposium on Gamma-Ray Bursts, ed. C. A. Meegan, R. D. Preece, & T. M. Koshut (Melville, NY: AIP), 409
5. Discovery of an X-ray afterglow associated with the γ-ray burst of 28 February 1997