The Spectral Evolution of Gamma-Ray Bursts

Details The Spectral Evolution of Gamma-Ray Bursts The Spectral Evolution of Gamma-Ray Bursts

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.8703c&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #87.03; Bulletin of the American Astronomical Society, Vol. 30, p.1380

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Scientific paper

The discovery of a gamma-ray burst (GRB) optical counterpart with a measurable redshift seems to have shown that the sources are cosmological in origin. The observed fading multi-wavelength afterglows are so far consistent with the simple relativistic blastwave model which radiates via a synchrotron shock. However, the emission mechanism resulting in the prompt gamma rays remains a mystery. We report on our discovery and interpretation of two important characterstics in the spectral evolution of GRBs which can be used to test possible emission mechanisms. We have found that the peak of the nu F_ν decays linearly with energy fluence (=int_ {t'=0}(t'=t) {F_ν}(t') dt'). We have also found that the asymptotic spectral slope below the peak in nu F_ν can be as steep or steeper than a blackbody, possibly ruling out models such as the synchrotron shock model. We propose that these two results suggest saturated Comptonization as the dominant emission mechanism during the early phase of GRBs.

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