IAU02213
Presentation type requested: POSTER
THE REDSHIFT FOR EACH LONG BRIGHT GAMMA-RAY BURST
Lajos G Balázs
Konkoly Observatory, Budapest
The low energy spectra of some gamma-ray bursts' show excess components beside the power-law dependence. We analyzed the consequences of such a feature regarding the different BATSE DISCSC energy channels, and found that this effect allows to estimate the gamma photometric redshift of the long gamma-ray bursts in the BATSE Catalog. This means that for each long bright gamma-ray burst we are able to determine its redshift. There is good correlation between the measured optical and the estimated gamma photometric redshifts, the average error is delta z=0.33. The estimated redshift values for the long bright gamma-ray bursts are up to z=4, while for the the faint long bursts - which should be up to z=20 - the redshifts cannot be determined unambiguously with this method. The redshift distribution of all the gamma-ray bursts with known optical redshift agrees quite well with the BATSE based gamma photometric redshift distribution.
Bagoly Zsolt , Csabai István , Mészáros Attila , Mészáros Peter , Horváth István
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