Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..312..441l&link_type=abstract
Third Rome Workshop on Gamma-Ray Bursts in the Afterglow Era ASP Conference Series, Volume 312, Proceedings of the conference he
Astronomy and Astrophysics
Astronomy
Scientific paper
Scattering by the baryon associated electrons or by a pair photosphere are sometimes invoked to explain spectral and/or temporal features in GRB lightcurves. Downscattering may be important to reproduce, within the internal shock model, the variability luminosity and the peak-frequency luminosity correlations. I here make use of the variability parameter of GRB lightcurves to produce average power spectra in 6 bins of variability. I find that the power spectra do not show any sign of a cutoff due to the smearing of the high frequencies by scattering. Rather, the different variability is due to a moving break in the power-law spectrum. I conclude that photon scattering is not important in shaping the lightcurves of GRBs.
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