Abstract
We report on the results of R-band observations of the error box of the gamma -ray burst of 1997 August 28 made between 4 hr and 8 days after this burst occurred. No counterpart was found varying by more than 0.2 mag down to R=23.8 . We discuss the consequences of this nondetection for relativistic blast wave models of gamma -ray bursts and the possible effect of redshift on the relation between optical absorption and the low-energy cutoff in the X-ray afterglow spectrum.
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