  We present a measurement of the charge asymmetry in top-antitop production
using data corresponding to an integrated luminosity of $0.70 fb^{-1}$ of
proton-proton collisions at $\sqrt s = 7$ TeV collected by the ATLAS detector.
The top pair events decaying semileptonically (lepton+jets channel) to either
an electron or muon, missing transverse energy and at least four jets are
selected. The reconstruction of the $t\bar{t}$ events was performed using a
kinematic likelihood approach. The difference of absolute values of top and
antitop rapidities is used to define the charge asymmetry: $A_{C} = (N(|\Delta
Y|>0) - N(|\Delta Y|<0)) / (N(|\Delta Y>0) + N(|\Delta Y|<0))$. To allow
comparisons with theory calculations, a Bayesian unfolding technique is applied
to correct the measured $|\Delta Y|$ distributions for acceptance and detector
effects. The top charge asymmetry in both channels (e and mu) after correction
is measured to be: $A_{C} = -0.009 \pm 0.023 (stat) \pm 0.032 (syst)$ (e+jets
channel) and $A_{C} = -0.028 \pm 0.019 (stat) \pm 0.022 (syst)$ ($\mu$+jets
channel) giving a combined result of : $A_{C} = -0.024 \pm 0.016 (stat) \pm
0.023 (syst)$. These results are compatible with the Standard Model predictions
of $A_{C}=0.006$.
