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We have gathered optical photometry data from the literature on a largesample of Swift-era gamma-ray burst (GRB) afterglows including GRBs up toSeptember 2009, for a total of 76 GRBs, and present an additional threepre-Swift GRBs not included in an earlier sample. Furthermore, we publish 840additional new photometry data points on a total of 42 GRB afterglows,including large data sets for GRBs 050319, 050408, 050802, 050820A, 050922C,060418, 080413A and 080810. We analyzed the light curves of all GRBs in thesample and derived spectral energy distributions for the sample with the bestdata quality, allowing us to estimate the host galaxy extinction. Wetransformed the afterglow light curves into an extinction-corrected z=1 systemand compared their luminosities with a sample of pre-Swift afterglows. Theresults of a former study, which showed that GRB afterglows clustered andexhibited a bimodal distribution in luminosity space, is weakened by the largersample. We found that the luminosity distribution of the two afterglow samples(Swift-era and pre-Swift) are very similar, and that a subsample for which wewere not able to estimate the extinction, which is fainter than the mainsample, can be explained by assuming a moderate amount of line-of-sight hostextinction. We derived bolometric isotropic energies for all GRBs in oursample, and found only a tentative correlation between the prompt energyrelease and the optical afterglow luminosity at one day after the GRB in thez=1 system. A comparative study of the optical luminosities of GRB afterglowswith echelle spectra (which show a high number of foreground absorbing systems)and those without reveals no indication that the former are statisticallysignificantly more luminous. (abridged)

The Afterglows of Swift-era Gamma-Ray Bursts. I. Comparing pre-Swift and Swift era Long/Soft (Type II) GRB Optical Afterglows