X-ray spectral properties of γ-ray bursts

Details X-ray spectral properties of γ-ray bursts X-ray spectral properties of γ-ray bursts

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..428..461s&link_type=abstract

Fourth Huntsville gamma-ray burst symposium. AIP Conference Proceedings, Volume 428, pp. 461-465 (1998).

Computer Science

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

Scientific paper

We summarize the spectral characteristics of a sample of 22 bright γ-ray bursts detected with the γ-ray burst sensors aboard the satellite Ginga. This instrument employed a proportional and scintillation counter to provide sensitivity to photons in the 2-400 keV range, providing a unique opportunity to characterize the largely unexplored X-ray properties of γ-ray bursts. The photon spectra of the Ginga bursts are well described by a low-energy slope, a bend energy, and a high-energy slope. In the energy range where they can be compared, this result is consistent with burst spectral analyses obtained from the BATSE experiment aboard the Compton Observatory. However, below 20 keV we find evidence for a positive spectral number index in approximately 40% of our burst sample, with some evidence for a strong rolloff at lower energies in a few events. We find that the distribution of spectral bend energies extends below 10 keV. The observed ratio of energy emitted in the X-rays relative to the γ-rays can be much larger than a few percent and, in fact, is sometimes larger than unity. The average for our sample is 24%.

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