Fig. 7
The optical afterglow of GRB 080928 (thick line) compared with the sample of extinction-corrected afterglows shifted to z = 1 from Kann et al. (2010). For comparison, the GRBs within a redshift interval of 0.1 around the redshift of GRB 080928 for which we have optical data are highlighted and labeled. All magnitudes are Vega magnitudes.
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