  We describe the automated calibration system for the antineutrino detectors
in the Daya Bay Neutrino Experiment. This system consists of 24 identical units
instrumented on 8 identical 20-ton liquid scintillator detectors. Each unit is
a fully automated robotic system capable of deploying an LED and various
radioactive sources into the detector along given vertical axes. Selected
results from performance studies of the calibration system are reported.
