Computer Science
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..384..238p&link_type=abstract
Gamma-ray bursts: 3rd Huntsville symposium. AIP Conference Proceedings, Volume 384, pp. 238-242 (1996).
Computer Science
3
Gamma-Ray Sources, Gamma-Ray Bursts, Gamma-Ray, Spectroscopy And Spectrophotometry
Scientific paper
The BATSE spectroscopy detectors were designed to detect photons with energies as low as 5 keV. For gamma-ray burst studies, the discriminators provide a broad-band energy bin available for spectral fitting, which lies below the burst high resolution spectroscopy data. The energy range of this bin can be as low as 5-10 keV depending on the gain setting of the detector. We have surveyed roughly 100 strong bursts which satisfy the following criteria: 1) sufficient signal-to-noise, 2) a detector observing the source with a viewing angle less than 60° and 3) a detector gain sufficient to bring the low-energy data coverage down to the 5-20 keV range of interest. Spectra integrated over the bright portions were fit with one of several spectral forms and the agreement between the fitted model and the low-energy data is determined. We find evidence that x-ray excesses exist in ~10% of the bursts. In most cases, the excess can be accounted for by a spectral model with upward curvature, such as has been proposed by Brainerd, or by a separate spectral component.
Band David L.
Briggs Michael Stephen
Matteson James L.
Meegan Charles A.
Paciesas William Simon
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