During the course of our optical deep survey program on LΞ± emitters at
zβ5.7 in the sky area surrounding the quasar SDSSp
J104433.04β012502.2 at z=5.74, we found that a faint galaxy with mBβ(AB)
β25 is located at \timeform{1".9} southwest of the quasar. Its
broad-band color properties from B to zβ² suggest that the galaxy is
located at a redshift of zβΌ1.5 -- 2.5. This is consistent with no strong
emission line in our optical spectroscopy. Since the counter image of the
quasar cannot be seen in our deep optical images, the magnification factor
seems not to be very high. Our modest estimate is that this quasar is
gravitationally magnified by a factor of 2.Comment: 11 pages, 5 figures, PASJ, in pres