Table 1: Properties of the X-ray afterglows detected by BeppoSAX. We indicate the absorbed flux extrapolated or interpolated to 11 h after the burst, the temporal decay and the energy spectral index, the Galactic column density from Dickey & Lockman (1990), the excess of absorption at z=0, and the excess of absorption at the proper redshift of the burst (assuming a distance of z=1 when the host galaxy redshift was unknown).
GRB name $\rm 1.6{-}10$ keV Flux Decay Spectral Galactic Excess of Excess of
  (10-13erg cm-2 s-1) index index column column column
    $\delta$ $\alpha$ density density (z=0) density
        $\rm (10^{22}$ cm-2) (1022 cm-2) (1022 cm-2)
GRB 970111 $\rm0.75 \pm 0.47$ $\rm 2.8^{-3.7}$ - - - -
GRB 970228 $\rm 20.8 \pm 2.7$ $\rm 1.32^{+0.15}_{-0.20}$ $\rm 1.04^{+0.21}_{-0.27}$ 0.16 $\rm <$0.4 $\rm <$1.12
GRB 970402 $\rm 1.35 \pm 0.73$ $\rm 1.11^{+1.5}_{-0.76}$ - - - -
GRB 970508 $\rm 5.72 \pm 0.90$ $\rm0.80^{+0.18}_{-0.15}$ $\rm 1.40^{+0.32}_{-0.27}$ 0.05 $\rm0.67^{+0.73}_{-0.35}$ $\rm 2.63^{+2.5}_{-1.37}$
GRB 971214 $\rm 6.36 \pm 0.91$ $\rm 1.00 \pm 0.22$ $\rm 1.08^{+0.40}_{-0.23}$ 0.02 $\rm <$1.23 $\rm <$53
GRB 971227 - $\rm >$0.4 - - - -
GRB 980329 $\rm 6.00 \pm 0.56$ $\rm 1.42^{+0.62}_{-0.48}$ $\rm 1.44^{+0.32}_{-0.26}$ 0.09 $\rm <$0.5 $\rm <$3.07
GRB 980425 $\rm 2.82 \pm 0.59$ $\rm0.10\pm0.06$ - - - -
GRB 980515 $\rm 5.6 \pm 2.2 $ $\rm >$0.51 - - - -
GRB 980519 $\rm 3.9^{+1.2}_{-1.1}$ $\rm 2.18^{+0.89}_{-0.65}$ $\rm 2.43^{+0.97}_{-0.65}$ 0.17 $\rm0.97^{+1.13}_{-0.65}$ $\rm 5.1^{+6.0}_{-3.8}$
GRB 980613 $\rm 2.6^{+1.2}_{-1.1}$ $\rm 1.49^{+1.9}_{-0.86}$ - - - -
GRB 980703 $\rm 14.0^{+7.0}_{-3.2}$ $\rm 1.10^{+0.36}_{-0.28}$ $\rm 1.71 \pm0.29 $ 0.06 $\rm0.52^{+0.38} _{-0.25}$ $\rm 2.6^{+2.0}_{-1.3}$
GRB 981226 $\rm 2.8^{2.1}_{1.3}$ $\rm0.66^{+0.68}_{-0.44}$ - - - -
GRB 990123 $\rm 54.2 \pm 1.7$ $\rm 1.45\pm0.06$ $\rm0.99\pm0.05$ 0.02 $\rm0.013^{+0.01}_{-0.008}$ 0.10+0.08-0.06
GRB 990217 $\rm 2.8^{+5.1}_{-1.4}$ $\rm >$0 - - - -
GRB 990510 $\rm 34.7 \pm 2.1 $ $\rm 1.4\pm0.1$ $\rm 1.17\pm 0.09$ 0.09 $\rm <$0.11 $\rm <$0.93
GRB 990627 $\rm 3.3^{+1.6}_{-1.5}$ $\rm 1.32^{+1.7}_{-0.92}$ - - - -
GRB 990704 $\rm 5.87 \pm 0.84$ $\rm0.88^{+0.28}_{-0.20}$ $\rm 1.68^{+0.45}_{-0.38}$ 0.03 $\rm0.72^{+0.7} _{-0.4}$ $\rm 4.1^{+3.4}_{-2.3}$
GRB 990806 $\rm 3.20 \pm 0.87$ $\rm0.9^{+0.47}_{-0.42}$ $\rm 1.31^{+0.57}_{-0.43}$ 0.04 $\rm <$2.2 <13.15
GRB 990907 $\rm 10.6 \pm 4.0 $ - - - - -
GRB 991014 $\rm 5.4^{+1.9}_{-1.5}$ $\rm 1.10^{+0.50}_{-0.32}$ - - - -
GRB 991106 $\rm 1.26 \pm 0.47 $ $\rm 1.1^{+2.5}_{-2.1}$ - - - -
GRB 000210 $\rm 3.10^{+0.90}_{-0.96}$ $\rm 1.41^{+0.98}_{-0.77}$ $\rm 1.54^{+0.31}_{-0.4}$ 0.03 $\rm0.4^{+0.4}_{-0.23}$ $\rm 1.71^{+1.7}_{-1.01}$
GRB 000214 $\rm 6.2^{+2.1}_{-1.8}$ $\rm0.68\pm0.41$ $\rm 1.04\pm0.27$ 0.06 $\rm <$0.17 $\rm <$0.36
GRB 000528 $\rm 3.0^{+4.1}_{-1.4}$ $\rm0.8^{+0.5}_{-1.5}$ - - - -
GRB 000529 $\rm 1.6 \pm 1.2$ $\rm >$0 - - - -
GRB 000615 $\rm 1.28 \pm 0.38 $ $\rm -0.23^{+1.4}_{-0.94}$ - - - -
GRB 000926 $\rm 32.6^{+15.7}_{-8.7}$ $\rm 1.79^{+0.21}_{-0.16}$ - - - -
GRB 001109 $\rm 23.2^{+5.8}_{-4.5}$ $\rm 1.47^{+0.22}_{-0.27}$ $\rm 1.29^{+0.27}_{-0.26}$ 0.04 $\rm0.62^{+0.45}_{-0.32}$ $\rm 3.4^{+2.3}_{-1.7}$
GRB 010214 $\rm 3.06^{+0.71}_{-0.64}$ $\rm 1.90^{+0.90}_{-0.53}$ - - - -
GRB 010220 $\rm <$1.43 - - - - -
GRB 010222 $\rm 70.6 \pm 3.4$ $\rm 1.35\pm0.06$ $\rm 1\pm0.06$ 0.02 $\rm0.16\pm0.04$ $\rm 1.27^{+0.33}_{-0.31}$
GRB 011121 $\rm 13.6 \pm 1.5$ $\rm 1.30\pm0.03$ - - - -
GRB 020321 $\rm <$3.4 - - - - -
GRB 020322 $\rm 3.8 \pm 0.8$ $\rm0.84^{+0.46}_{-0.35}$ - - - -
GRB 020410 $\rm 77.8^{+6.3}_{-6.9}$ $\rm0.92\pm0.12$ $1.3\pm0.19$ 0.08 $\rm <$0.7 $\rm <$4.8
GRB 020427 $\rm 4.8 \pm 1.7$ $\rm 1.3^{+0.10}_{-0.12}$ - - - -


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