  We present the spectral and temporal analysis of the 2004/2005 outburst of
the transient X-ray pulsar V0332+53 as observed with Integral. After the
discovery of the third cyclotron line in phase averaged spectra (Kreykenbohm et
al 2005, Pottschmidt et al 2005), detailed pulse phase spectroscopy revealed
remarkably little variability of the cyclotron lines through the 4.4s X-ray
pulse (Pottschmidt et al 2005). During the decline of the outburst, the flux
was observed to decay exponentially until 2005 Feb 10 and linearly thereafter.
The spectrum was found to become harder with time, while the folding energy
remained constant. The energy of the fundamental cyclotron line increased with
time from 26.5kev in the RXTE observation up to 29.5kev in the last Integral
one indicating that the emission region is moving closer to the surface of the
neutron star. For a detailed analysis, see Mowlavi et al (2005).

Astrophysics