The Role of Ground-Based Robotic Observatories in Satellite Projects
The X-ray (IBIS, (a)) and optical (OMC, (b)) light curves for V1223 Sgr. The fluxes especially in (15–25) keV and (25–40) keV bands are long-term variable with significant drop around MJD 53 650. Optical variations are correlated with the changes in (15–25) keV, (25–40) keV and (40–60) keV spectral bands with correlation coefficient 0. 81, 0.82, and 0.89, respectively. The fluxes from INTEGRAL/JEM-X were persistent within their errors in monitored time period.