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We report on a preliminary measurement of time-dependent CP-violatingasymmetries in B0 --> J/psi K0S and B0 --> psi(2S) K0S decays recorded by theBABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sampleconsisted of 9.0 fb-1 collected at the Y(4S) resonance and 0.8 fb-1off-resonance. One of the pair of neutral B mesons produced at the Y(4S) wasfully reconstructed, while the flavor of the other neutral B meson was taggedat the time of its decay. The value of the asymmetry amplitude, sin(2beta), wasdetermined from a maximum likelihood fit to the time distribution of 120 taggedcandidates to be sin(2beta) = 0.12 +- 0.37 (stat.) +- 0.09 (syst.)(preliminary).Comment: 5 pages, submitted to DPF200

FIRST MEASUREMENT OF THE CP-VIOLATING ASYMMETRIES WITH BABAR