  In the light of the top quark discovered very recently by CDF, we investigate
the possibility of narrowing down the allowed top quark masses by combining for
the first time only two strongest constraints present in the no-scale
$SU(5)\times U(1)$ supergravity model, namely, the ones from the
flavor-changing radiative decay $b\rightarrow s\gamma$ and the precision
measurements at LEP in the form of $\epsilon_{1}$. It turns out that even
without including the most devastating constraint from $\Zbb$ measurement at
LEP in the form of $R_b$ directly or $\epsilon_b$ indirectly, the combined
constraint from $b\rightarrow s\gamma$ and $\epsilon_1$ alone in fact excludes
$m_t(m_t)\gsim 180\GeV$ altogether in the no-scale model, providing a
constraint on $m_t$ near the upper end of the CDF values. The resulting upper
bound on $m_t$ is stronger and $5 \GeV$ lower than the one from combining
$\epsilon_1$ and $\epsilon_b$ constraints and also combining $b\rightarrow
s\gamma$ and $\epsilon_b $ constraints in the previous analysis.
