  We study the broad band (3-100 keV) spectrum of Cygnus X-2 with INTEGRAL. We
find that the spectrum is well fitted by a Comptonized component with a
seed-photons temperature of ~1 keV, an electron temperature of ~3 keV and an
optical depth tau ~ 8. Assuming spherical geometry, the radius of the
seed-photons emitting region is ~17 km. The source shows no hard X-ray
emission; it was detected only at a 3 sigma level above 40 keV. We also
analyzed public ISGRI data of Cyg X--2 to investigate the presence of a hard
X-ray component. We report the possible presence of hard X-ray emission in one
data set.
