2040001

Black hole X-ray binaries (BHXBs) cycle through different accretion states rapidly providing a time- resolved view of how matter behaves in a strong gravity environment. Simultaneous multi-wavelength observations are the optimal tool that exposes this view. However these campaigns (connecting the evolving accretion inflow and jet outflow) have been rarely achieved. We request a TOO consisting of two INTEGRAL revolutions (340ks) of a BHXB as it transitions from the hard to the soft state to complement our Astrosat accepted coverage. Our target list contains 15 candidates. We target the transition to reveal both the rapid orbit-to-orbit X-ray variability and the slower X-ray variability that characterize the significantly changing accretion disk (derived from X-ray spectra and timing) and directly measure the broad-band SED in connection with multi-wavelength coverage. The INTEGRAL data will be crucial to extend the coverage at high energies and obtain complete spectral information. [truncated! Please see actual data for full text]