Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..138..405c&link_type=abstract
Astronomy and Astrophysics Supplement, v.138, p.405-406
Astronomy and Astrophysics
Astrophysics
7
Gamma-Rays: Bursts, Gamma-Rays: Observations, Radiation Mechanisms: Non-Thermal, Techniques: Spectroscopic
Scientific paper
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 fit GRB 970111, which shows strong evidence for such absorption, with a synchrotron shock spectra suffering self-absorption. The synchrotron self-absorption shape does fit the BATSE time-evolving spectra, 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 field strength of 4 \ 10(7) G is required.
Crider Anthony
Liang Edison P.
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