Table 2: Results reported from previous analysis of X-ray afterglows detected by BeppoSAX. In this table, we indicate the temporal decay, the energy index, the fitted value of $n_{\rm H}$ compared to the galactic column density and the associated reference. A label "W'' close to the decay index indicates that this value was obtained by means of WFC and NFI data.
GRB  Temporal Energy $n_{\rm H}$ / $n_{\rm H}^G$ 2-10 keV flux Ref.
name indexa index   at 105 s a  
  $\delta$ $\alpha$ ( $\times10^{21}$ cm-1) (erg cm-2s-1)  
GRB 970111 $\rm >$1.5 - - $\rm <$ $1.0\times10^{-13}$ Feroci et al. (1998)
GRB 970228 1.3 $\pm$ 0.2 1.1 $\pm$ 0.3 $\rm 3.5_{-2.3}^{+3.3}$ / 1.6 $\rm\sim$ $6.8\times10^{-13}$ Costa et al. (1997); Frontera et al. (1998)
GRB 970402 $\rm 1.45 \pm 0.15$ 1.7 $\pm$ 0.6 $\rm <$20 / 2.0 $\rm\sim$ $4.5\times10^{-14}$ Nicastro et al. (1998)
GRB 970508 1.1 $\pm$ 0.1b 0.5 $\pm$ 0.55 $\rm 6.0_{-3.3}^{+7.9}$ / 0.5 $\rm 3.5\times10^{-13}$ Piro et al. (1998b,1999)
GRB 971214 $\rm\sim$1.2 0.6 $\pm$ 0.2 $\rm 1.0_{-1.0}^{+2.3}$ / 0.6 - Dal Fiume et al. (2000)
GRB 971227 $\rm 1.12^{+0.08}_{-0.05}$(W) [1.1] [0.13] / 0.13 $\rm\sim$ $1.4\times10^{-13}$ Antonelli et al. (1999)
GRB 980329 1.3 $\pm$ 0.03 (W) 1.4 $\pm$ 0.4 10 $\pm$ 4 / 0.9 $2.0\times10^{-13}$ in't Zand et al. (1998)
GRB 980425 0.16 $\pm$ 0.04 1.0 $\pm$ 0.18 [0.39] / 0.39 $\rm\sim$ $4.0\times10^{-13}$ Pian et al. (2000)
GRB 980519 1.83 $\pm$ 0.30 $\rm 1.8^{+0.6}_{-0.5}$ 3-20 / 1.73 $\rm 8.0\times10^{-14}$ Nicastro et al. (1999)
GRB 980613 1.19 $\pm$ 0.17(W) -- - $\rm\sim$ $2.3\times10^{-13}$ Soffitta et al. (2002)
GRB 980703 $\rm >$0.91 1.51 $\pm$ 0.32 $\rm 36_{-13}^{+22}$$^{\rm c}$ / 0.34 $\rm 4.5\times10^{-13}$ Vreeswijk et al. (1999)
GRB 981226 1.3 +0.5-0.4 0.92 $\pm$ 0.47 [0.18] / 0.18 $\sim$ $2.0\times10^{-13}$ Frontera et al. (2000b)
GRB 990123d 1.46 $\pm$ 0.04 0.94 $\pm$ 0.08 $\rm0.9^{+15} _{0.9}$ / 0.21 $\rm 1.25\times10^{-12}$ Maiorano et al. (2005)
GRB 990510 1.42 $\pm$ 0.07 1.03 $\pm$ 0.08 2.1 $\pm$ 0.6/0.94 $\rm 9.6\times10^{-13}$ Kuulkers et al. (2000)
GRB 990704 0.83 $\pm$ 0.16 $\rm0.7^{+0.4}_{-0.2}$ [0.3] / 0.3 $\rm\sim$ $3.3\times10^{-13}$ Feroci et al. (2001)
GRB 990705 1.58 $\pm$ 0.06 - - $\rm <$ $1.2\times10^{-13}$ Frontera et al. (2003)
GRB 990806 1.15 $\pm$ 0.03(W) $\rm 1.16^{+0.3}_{-0.37}$ [0.35] / 0.35 $\rm\sim$ $2.0\times10^{-13}$ Montanari et al. (2002)
GRB 991014 $\rm >$0.4 0.53 $\pm$ 0.25 [2.5]/ 2.5 $\rm\sim$ $3.0\times10^{-13}$ in't Zand et al. (2000b)
GRB 000210 $\rm 1.38\pm0.03$(W) $\rm0.75\pm0.3$ $\rm <$ $4\times10^{21}$ $\rm\sim$ $2\times 10^{-13}$ Piro et al. (2002)
GRB 000214 0.8 $\pm$ 0.3 1.0 $\pm$ 0.18 $\rm0.7_{-0.7}^{+7.5}$/ 0.55 $\rm\sim$ $3.5\times10^{-13}$ Antonelli et al. (2000)
GRB 000926 $1.89^{+0.16 e}_{\rm -0.19}$ $\rm0.9\pm0.42$ 4/0.27e,f $\rm 9.0\times10^{-13}$ Piro et al. (2001)
GRB 001109 1.18 $\pm$ 0.05 1.4 $\pm$ 0.3 8.7 $\pm$ 0.4/0.42 $\rm\sim$ $8.0\times10^{-13}$ Amati et al. (2003)
GRB 010214 $\rm 2.1^{+0.6}_{-1.0}$ $\rm0.3^{+0.8}_{-0.6}$ [0.27] / 0.27 - Guidorzi et al. (2003)
GRB 010222 1.33 $\pm$ 0.04 0.97 $\pm$ 0.05 1.5 $\pm$ 0.3/ 0.16 $\rm 2.4\times10^{-12}$ in't Zand et al. (2001)
GRB 011121 $\rm 1.29\pm0.03$(W) $\rm 1.6\pm0.5$ $\rm <$100/ $\rm\sim$10-13 Piro et al. (2005)
GRB 020321 - - - $\rm <$ $3\times10^{-13}$ in't Zand et al. (2004)
GRB 020410 $\rm0.81\pm0.07$ $\rm 1.05\pm0.08$ - $\rm\sim$ $3.5\times10^{-12}$ Nicastro et al. (2004)
GRB 020427 $\rm 1.3^{+0.13} _{0.09}$ $\rm 1^{+2.2} _{-1.1}$ 0.29/0.29 $\rm\sim$10-13 Amati et al. (2004)
a All upper limits are 3$\sigma$, except for GRB 990705, which are 2$\sigma$. b From $6 \times 10^{4}$ s to  $5.8 \times 10^{5}$ s. c $n_{\rm H}$ value corrected for redshift. d Spectral data of the first 20 000 s. The time decaying index includes the whole NFI TOO. e SAX plus CHANDRA data (Piro et al. 2001). f Corrected for redshift (Piro et al. 2001). This  $n_{\rm H}^z$ value was added to the Galactic column density  $n_{\rm H}^G$.

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