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The analysis of the light curves of the optical counterparts of GRB 970228and GRB 970508 points out remarkable similarities. The spectral distributionobtained from the color indices shows that both the transients became bluerduring the increasing stage, and redder after the maximum. A main differenceconcerns the behaviour of the optical fading which is well fitted by a singlepower law in the case of GRB 970508 but not in the case of GRB 970228.Comment: 5 pages plus 6 .ps figures, AIP style file aipproc.sty (included). To  appear in the Proceedings of the 4th Huntsville Symposium on Gamma-Ray  Bursts. Replaced version with bibliographic references in the tex

Did GRB970228 and GRB970508 present similar optical properties?