Abstract
The time-resolved spectra of several gamma- ray bursts have shown that near the beginning of the burst, some absorption mechanism makes the spectra inconsistent with the simple optically-thin synchrotron shock model. We t GRB 970111, which shows strong evidence for such absorption, with a synchrotron shock spectra suering self-absorption. The synchrotron self- absorption shape does t the BATSE time-evolving spec- tra, although it may be inconsistent with BeppoSAX WFC data. If the turnover just below the spectral break is due to synchrotron self-absorption, a magnetic eld strength of 4 10 7 G is required.
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