Black hole transient during transition from hard to soft state

We propose a ToO observation of a transient blackhole candidate, either knownor unknown, during its transition from hard to soft state. This transition,which takes place at high flux levels, encompasses marked changes in theproperties of the accretion flow and it includes the time at which the ejectionof an accelerating relativistic jet stops abruptly. The study of the softspectral component as well as the behaviour of the iron line is important forour understanding of the accretion disc during state transition. We would liketo investigate in particular the process responsible for the disappearance ofthe variability in the soft energy band, which has been detected in the hardstate with XMMNewton, but is absent in the soft state. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]