  The charmonium potential at non-zero temperature has been studied using gauge
configurations with anisotropic lattices and 2+1 dynamical flavors of light sea
quarks. We use the HAL QCD time-dependent method developed for the study of
nucleon-nucleon potentials. To serve as in-put, local-extended charmonium
correlators were calculated. The results are consistent with the expectation
that the potential between heavy quarks should become deconfining at high
temperatures.
