Table 5: Optical decay indexes and comparison with the X-ray band decay indexes.
GRB  $\rm\delta_{\rm O}$ $\rm\delta_{\rm X} - \delta_{\rm O}$ Reference
GRB 970228 $\rm 1.21\pm0.02$ $\rm0.1 \pm 0.2$ 1
GRB 970508 $\rm0.15\pm0.02$ $\rm0.65 \pm 0.2$ 2
GRB 971214 $\rm 1.20\pm0.02$ $\rm -0.2\pm 0.3$ 3
GRB 980329 $\rm 1.3\pm0.2$ $\rm0.1 \pm 0.6$ 4
GRB 980613 $\rm0.8\pm0.5$ $\rm0.7^{+1.1}_{-2.0}$ 5
GRB 980703 $\rm 1.2\pm0.4$ $\rm -0.1\pm 0.5$ 6
GRB 990123 $\rm 1.1\pm0.4$ $\rm0.3 \pm 0.4$ 7
GRB 990510 $\rm0.8\pm0.2$ $\rm0.6 \pm 0.3$ 8
GRB 010222 $\rm 1.32\pm0.03$ $\rm0.03 \pm 0.07$ 9
GRB 011121 $\rm 1.6\pm0.6$ $\rm -0.3\pm 0.6$ 10
GRB 011211 $\rm0.95\pm0.2$ $\rm 1.2\pm0.4$ 11
GRB 020322 $\rm0.5\pm0.3$ $\rm0.3 \pm 0.5$ 12, 13
References: 1: Masetti et al. (1998), 2: Galama et al. (1998, the index shown is relative to the BeppoSAX observation interval), 3: Diercks et al. (1998), 4: Reichart et al. (1999), 5: Hjorth et al. (2002), 6: Bloom et al. (1998), 7: Kulkarni et al. (1999), 8: Harrison et al. (1999), 9: Masetti et al. (2001), 10: Price et al. (2002), 11: Jacobsson et al. (2003), 12: Bloom et al. (2002), 13: Greiner et al. (2002).

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