  Latest observational data provides evidence that the emissions from Sgr A*
originate from an accretion disc within ten gravitational radii of the
dynamical centre of Milky Way. We investigate the physical processes
responsible for the variable observed emissions from the compact radio source
Sgr A*. We study the evolution of the variable emission region and analyse
light curves and time-resolved spectra of emissions originated at the surface
of the accretion disk, close to the event horizon, near the marginally stable
orbit of a Kerr black hole.
