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N. Butler, H. Marshall, G. Ricker, P. Ford, R. Vanderspek, G. Crew (MIT CSR), D. Lamb (U. Chicago)
We report the detection of lines from light elements (Si, S, and Ca), and possibly Ni, in the Chandra HETGS spectrum taken ~1 day after GRB 020813. These appear to be variable and seem to be well fit by a reflection model. Lines from Fe are not observed, indicating that a pre-cursor SN must have been recent. We discuss the significance and interpretation of the spectral features observed.
This research was supported in part by NASA contract NASW-4690.
Bulletin of the American Astronomical Society,
© 2003. The American Astronomical Soceity.