1997A&A...318L..67C

We report the discovery of a new gravitationally lensed BAL QSO SBS 1520+530 (α(2000)=15h21m44.83s, δ(2000)=52deg54'48.6") at z_em=1.855 from the Second Byurakan Survey using observations with the 6m and 1m telescopes of SAO RAS. Two components with apparent V magnitudes 18.2mag and 18.7mag are resolved with a distance separation 1.6". The spectra, taken with the long-slit spectrograph, exhibit strong SiIV/OIV], CIV and CIII] emission lines with the redshifts 1.855±0.002 and 1.854±0.002, respectively, and two systems of metal-line absorption at z_abs=0.7155±0.0009 and 0.8147±0.0009. The blue wing of CIV lines displays BAL futures. SBS 1520+530, the second gravitationally lensed BAL QSO, offers good opportunity for ground-based and space studies of numerous phenomena connected with physics of lensing because of its appearent magnitude and appropriate separation between companions.