  We present time resolved optical data acquired by the TAROT automated
observatory on the afterglow of GRB 050525a from 6 to 136 minutes after the
GRB. We evidence a rapid re-brightening of 0.65 magnitude of the afterglow at
$\sim$ 33 min after the GRB. The decay slope $\alpha$ is $1.14\pm 0.07$ in the
first part and is $1.23\pm 0.27$ after the re-brightening event. The afterglow
of GRB 050525a is the third known afterglow that exhibits a re-brightening
event begining at 0.01--0.02 day in the rest time frame.
