Table 2: Observed properties of 18 GRBs with no measured redshift. The eight columns give the name of the GRB, the time of arrival, the duration T90 in seconds, the three spectral parameters ($\alpha $, $\beta $, and E0), the gamma-ray fluence  $S_{\gamma }$ in units of 10-6 erg cm-2 in the range 30-400 keV, the pseudo-redshift $\hat{z}$, and a comment on the eventual detection of an afterglow (XRR stands for X-Ray Rich GRB, OA, XA, and RA, respectively for Optical Afterglow, X-ray Afterglow, and Radio Afterglow).
\begin{table}\begin{displaymath} \begin{array}{llllllll} \hline\hline \noalign... ...rm XRR} \\ \noalign{\smallskip } \hline \end{array}\end{displaymath}\end{table}

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