  A narrow resonance peak was observed at 1.54 +/- 0.01 GeV as an exotic baryon
with strangeness S = +1 in the gamma + n going to K^+ + K^- + n reaction on
Carbon. The new state have a width smaller than 0.025 GeV and a Gaussian
significance of 4.6 sigma. It can not be interpreted as three quark state and
is consistent with the lightest member of an antidecuplet of baryons predicted
by the chiral soliton model.
