Normalized flux averaging of the photon spectra of BATSE GRBs

Details Normalized flux averaging of the photon spectra of BATSE GRBs Normalized flux averaging of the photon spectra of BATSE GRBs

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..428..374c&link_type=abstract

Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 374-378 (1998).

Physics

Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray, Spectroscopy And Spectrophotometry

Scientific paper

We apply the method of Normalized Flux Averaging (NFA) to the analysis of 16-channel photon spectra of BATSE GRBs. The method allows us to find average parameters of Band's spectral function (low-energy spectral index α and νFν peak energy Ep) for selected time intervals where the normalized flux (the apparent flux divided by the peak flux) falls into a predefined range. We have found that while the average Ep correlates with flux, the average α exhibits a clear irreversible decrease after the main peaks of bursts. For the bright and dim groups of bursts the patterns of spectral evolution in α vs. Ep are similar. However, the dim bursts are significantly softer than the bright ones in terms of Ep.

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