  We measured the resistivity, diamagnetization and low temperature specific
heat of the newly discovered noncentrosymmetric superconductor
$Mg_{10}Ir_{19}B_{16}$. It is found that the superconducting gap has an s-wave
symmetry with a value of about $\Delta_0 \approx$ 0.6 meV, and the ratio
$\Delta_0/k_BT_c\approx1.86$ indicates a weak coupling for the
superconductivity. The correlations among the normal state Sommerfeld constant
$\gamma_n$, the slope $-d\mu_0H_{c2}(T)/dT$ near Tc and the condensation energy
Ec are all consistent with the weak coupling picture. The separated phonon
contribution from the specific heat shows that the conduction electrons of the
$Ir$ atoms interact most strongly with the vibrations of themselves, instead of
with that of the light element boron.
