1220042

We propose fixed-time observations of the galactic microquasar SS433 with a total duration of ~ 500 ks centered at the middle of the orbital hard X-ray eclipse at the disk precessional phase $Psi ~ 0$ of the source in May 2015 (INTEGRAL orbits 1538-1540). The proposal is the continuation of INTEGRAL observations of the unique galactic source SS433 carried out in previous AOs. The main scientific goal of the new observations is to investigate the form of hard X-ray flux variations before and after the X-ray eclipse in order to study the accretion disk nutation effects discovered by previous INTEGRAL observations. These observations should also add to confirm spectral changes across the primary eclipse. The results will be used to understand the physics of supercritical accretion disk and hot scattering corona around it discovered by INTEGRAL a unique feature of SS433 among other galactic microquasars. The proposal is not associated with any of the AO12 Key Programs. [truncated! Please see actual data for full text]