Estimation of the Redshifts for Long Gamma-Ray Bursts

Details Estimation of the Redshifts for Long Gamma-Ray Bursts Estimation of the Redshifts for Long Gamma-Ray Bursts

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..446b&link_type=abstract

GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed

Astronomy and Astrophysics

Astronomy

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

It is known that the soft tail of 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 us to estimate the redshifts of bright long gamma-ray bursts given in the BATSE Catalog. For the 8 gamma-ray bursts, which have both BATSE DISCSC data and measured optical spectroscopic redshifts, the correlation between the true and estimated redshifts is remarkable, and the average error is Δz ~ 0.5. The method is similar to the photometric redshift estimation of galaxies in the optical range, hence we call it ``gamma photometric redshift estimation''. These redshifts for the remaining 857 long bright gamma-ray bursts are are up to z ~= (4 - 7). For the the faint long bursts - which should be up to z ~= 20 - the redshifts hardly can be determined unambiguously from this method.

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