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A gamma-ray burst of 28 August 1997 was localized by the All-Sky Monitor onthe Rossi XTE satellite and its coordinates were promptly disseminated. An ASCAfollowup started 1.17 days after the burst as a Target of OpportunityObservation and detected an X-ray afterglow. The spectral data displayed a humparound ~5 keV and an absorption column of 7.1 x 10^21 cm^{-2}. This humpstructure is likely a recombination edge of iron in the vicinity of the source,taking account of the redshift z = 0.9578 found for the likely host galaxy ofthe associated radio flare. Radiative Recombination edge and Continuum modelcan interpret the spectrum from highly ionized plasma in a non equilibriumionization state. The absorption could be also due to the medium presumably inthe vicinity of the GRB.Comment: To appear in the Astrophysical Journal Letters, 13 pages including 2  figures.(Companion paper: Yonetoku et al. (2001)

A Possible Emission Feature in an X-Ray Afterglow of GRB 970828 as a Radiative Recombination Edge