**Table 1:** Observed properties of 17 GRBs with known redshift. The ten columns give the GRB name, the duration T₉₀ in seconds, the three spectral parameters ( $\alpha , \beta$ , and E₀), the gamma-ray fluence $S_{\rm\gamma }$ in units of 10^-6 erg cm^-2, the spectroscopic redshift z, the pseudo-redshift $\hat{z}$ , the ratio $\hat{z}$ /z, and a reference for the spectral parameters.
$\begin{table}\begin{displaymath} \begin{array}{llllllllll} \hline\hline \noali... ....99 & 7 \\ \noalign{\smallskip } \hline \end{array}\end{displaymath}\end{table}$

$^{{\it a}}$ $\beta$ has been frozen to -2.3 for HETE GRBs 010921 to 030228.
1 Amati et al. (2002). Fluence measured in the range 40-700 keV.
2 Andersen et al. (2000). Fluence measured in the range 28-1800 keV.
3 Barraud et al. (2003). Fluence measured in the range 30-400 keV.
4 Sakamoto et al. (2003). Fluence measured in the range 7-30 keV.
5 Crew et al. (2003). Fluence measured in the range 7-30 keV.
6 Lamb et al. (2003). Fluence measured in the range 30-400 keV.
7 Vanderspek et al. (2003). Fluence measured in the range 7-30 keV.