Table 3: X-ray properties of the GRBs with known redshift and data collected from the literature. $\alpha $ and  $\beta _{\rm X}$ are the temporal and spectral power law indices, respectively [i.e. $F(\nu ,t)\propto t^{-\alpha }\nu ^{-\beta _{\rm X}}$]. $F_{\rm X}$ is the observed X-ray flux integrated in the reported energy band and $L_{10~{\rm keV}}^{12~{\rm h}}$ is the monochromatic X-ray luminosity at 12 h (rest frame) calculated at 10 keV.
GRB z $\alpha $ $\beta _{\rm X}$ $F_{\rm X}$ $t_{\rm obs}$ band $\log L_{10~{\rm keV}}^{12~{\rm h}}$ Ref.
        10-12 cgs   keV    
970228 0.6951 1.3 $\pm $ 0.1 1.1 $\pm $ 0.3 1.0 $\pm $ 0.2 1d 2-10 26.81 co97
970508 0.835 1.1 $\pm $ 0.1a 1.1 $\pm $ 0.3 1.0 $\pm $ 0.4 1d 2-10 26.97 gb05, pi98
971214 3.418 1.1 $\pm $ 0.1 1.2 $\pm $ 0.4 0.23 $\pm $ 0.05 1d 2-10 27.47 co99, gb05
980613 1.096 1.1 $\pm $ 0.2 1 0.27 $\pm $ 0.07 1d 2-10 26.63 co99
980703 0.966 0.9 $\pm $ 0.2 1.8 $\pm $ 0.4 0.48 $\pm $ 0.07 1d 2-10 26.70 gb05
990123 1.60 1.35 0.99 $\pm $ 0.07 5.3 $\pm $ 0.2 11h 1.6-10 27.69 dp03, he99
    1.44 $\pm $ 0.11 1.00 $\pm $ 0.05 1.8 $\pm $ 0.4 1d 2-10 27.72 gb05
990510 1.619 1.4 $\pm $ 0.1 1.2 $\pm $ 0.2 1.2 $\pm $ 0.2 1d 2-10 27.57 gb05
991216 1.02 1.6 $\pm $ 0.1 1.2 $\pm $ 0.2 2.58 37h 2-10 27.77 pi00
    1.6 $\pm $ 0.1 0.8 $\pm $ 0.5 5.6 $\pm $ 0.3 1d 2-10 27.89 gb05
000210 0.8462 1.38 $\pm $ 0.03 0.95 $\pm $ 0.15 0.4 $\pm $ 0.06 11h 2-10 26.13 pi02
    1.38 $\pm $ 0.03 0.9 $\pm $ 0.2 0.21 $\pm $ 0.06 1d 2-10 26.32 gb05
000214 0.423 0.8 $\pm $ 0.5b 1.2 $\pm $ 0.3 0.77 $\pm $ 0.08 15h 2-10 26.01 an00
    0.7 $\pm $ 0.3 1.2 $\pm $ 0.5 0.6 $\pm $ 0.2 1d 2-10 26.05 gb05
000926 2.066 1.7 $\pm $ 0.5 0.7 $\pm $ 0.2 0.12 $\pm $ 0.1 2.78d 2-10 27.35 gb05
010222 1.477 1.33 $\pm $ 0.04 1.01 $\pm $ 0.06 2.7 $\pm $ 0.6 1d 2-10 27.85 gb05
011121 0.36 4+3-2 2.4 $\pm $ 0.4 0.6 $\pm $ 0.2 1d 2-10 26.11 gb05
011211 2.14 1.3 $\pm $ 0.1 1.2 $\pm $ 0.1 0.03 $\pm $ 0.01 1d 2-10 26.19 gb05
020405 0.69 1.9 $\pm $ 1.1 0.72 $\pm $ 0.21 1.36 $\pm $ 0.25 1.71d 0.2-10 27.21 mi03
020813 1.25 1.38 $\pm $ 0.06 0.85 $\pm $ 0.04 2.2 1.33d 0.6-6 27.70 bu03
021004 2.33 0.9 $\pm $ 0.1 1.01 $\pm $ 0.08 0.63 1.37d 0.6-6 27.60 but03
030226 1.98 2.7 $\pm $ 1.6 0.9 $\pm $ 0.2 0.035 $\pm $ 0.002 1.77d 2-10 26.59 gb05
030329 0.168 0.9 $\pm $ 0.3 0.9 $\pm $ 0.2 14.3 $\pm $ 2.9 1d 2-10 26.69 gb05
a 970508 showed a substantial rebrightening, correlated with the optical (Piro et al. 1998); b decay index considering only MECS data. If WFC is included, $\alpha=1.41$ $\pm $ 0.03 (Antonelli et al. 2000). For GRB 030329 we have calculated the X-ray flux at 12 h rest frame extrapolating from earlier data, since this GRBs showed a jet break at approximately 10 h (rest frame time) (see Tiengo et al. 2004). References: co97: Costa et al. (1997); gb05: Gendre & Boër (2005); pi98: Piro et al. (1998); st04: Stratta et al. (2004); co99: Costa et al. (1999); dp03: De Pasquale et al. (2003); he99: Heise et al. (1999); pi00: Piro et al. (2000); pi02: Piro et al. (2002); an00: Antonelli et al. (2000); mi03: Mirabal et al. (2003); bu03: Butler et al. (2003). 1 Djorgovski et al. (1999); 2 Piro et al. (2002); 3 Antonelli et al. (2000).

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