Free Access
Astron. Astrophys. Suppl. Ser.
Volume 138, Number 3, September 1999
Gamma-Ray Bursts in the Afterglow Era Contents Rome, November 3-6, 1998
Page(s) 529 - 530
Published online 15 September 1999
DOI: 10.1051/aas:1999334

Astron. Astrophys. Suppl. Ser. 138, 529-530

GRB spectral turnover and the saturated Compton cooling model

E. Liang

Send offprint request: E. Liang

Department of Space Physics and Astronomy, Rice University, 6100 S. Main, Houston, TX 77005-1892, U.S.A.

Received December 29, 1998; accepted March 30, 1999


We revisit the different physical interpretations of the spectral break in GRB continuum and the low energy turnover, especially at the beginning of pulses. We argue that optically thin synchrotron emission can be ruled out in many cases. Alternative models are discussed. We then concentrate on one paricularly attractive model: saturated Comptonization of soft photons. We summarize the various predictions of this model and highlight the critical tests of this model that may be provided by existing and future data.

Key words: gamma-rays: bursts -- gamma-rays: observations -- radiation mechanisms: non-thermal -- techniques: spectroscopic

Copyright The European Southern Observatory (ESO)

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