Gamma photometric redshifts for long gamma-ray bursts

Details Gamma photometric redshifts for long gamma-ray bursts Gamma photometric redshifts for long gamma-ray bursts

2002-11-25

arxiv.org/abs/astro-ph/0211539v1

Astron.Astrophys. 398 (2003) 919-926

Astronomy and Astrophysics

Astrophysics

accepted in A&A, 7 pages incl. 7 figures

Scientific paper

10.1051/0004-6361:20021724

It is known that the soft tail of the gamma-ray bursts' spectra show excesses from the exact power-law dependence. In this article we show that this departure can be detected in the peak flux ratios of different BATSE DISCSC energy channels. This effect allows to estimate the redshift of the bright long gamma-ray bursts in the BATSE Catalog. A verification of these redshifts is obtained for the 8 GRB which have both BATSE DISCSC data and measured optical spectroscopic redshifts. There is good correlation between the measured and esti redshifts, and the average error is $\Delta z \approx 0.33$. The method is similar to the photometric redshift estimation of galaxies in the optical range, hence it can be called as "gamma photometric redshift estimation". The estimated redshifts for the long bright gamma-ray bursts are up to $z \simeq 4$. For the the faint long bursts - which should be up to $z \simeq 20$ - the redshifts cannot be determined unambiguously with this method.

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