Testing for synchrotron self-absorption in GRB 970111

Details Testing for synchrotron self-absorption in GRB 970111 Testing for synchrotron self-absorption in GRB 970111

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.

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