We present physical properties of two submillimeter selected gravitationally lensed sources , identified in the Herschel Astrophysical Terahertz Large Area Survey .
These submillimeter galaxies ( SMGs ) have flux densities > 100 mJy at 500 \mu m , but are not visible in existing optical imaging .
We fit light profiles to each component of the lensing systems in Spitzer IRAC 3.6 and 4.5 \mu m data and successfully disentangle the foreground lens from the background source in each case , providing important constraints on the spectral energy distributions ( SEDs ) of the background SMG at rest-frame optical-near-infrared wavelengths .
The SED fits show that these two SMGs have high dust obscuration with A _ { V } \sim 4 - 5 and star formation rates of \sim 100 M _ { \odot } yr ^ { -1 } .
They have low gas fractions and low dynamical masses compared to 850 \mu m selected galaxies .