  We report the discovery of a new ultra-bright submillimeter galaxy (SMG)
behind the Small Magellanic Cloud (SMC). This SMG is detected as a 43.3+-8.4
mJy point source (MM J01071-7302, hereafter MMJ0107) in the 1.1 mm continuum
survey of the SMC by AzTEC on the ASTE telescope. MMJ0107 is also detected in
the radio (843 MHz), Herschel/SPIRE, Spitzer MIPS 24 {\mu}m, all IRAC bands,
Wide-field Infrared Survey Explorer, and near-infrared (J, H, KS). We find an
optical (U, B, V) source, which might be the lensing object, at a distance of
1.4 arcsec from near-infrared and IRAC sources. Photometric redshift estimates
for the SMG using representative spectral energy distribution templates show
the redshifts of 1.4-3.9. We estimate total far-infrared luminosity of
(0.3-2.2)x10^14 {\mu}^-1 L_sun and a star formation rate of 5600-39, 000
{\mu}^-1 M_sun yr^-1, where {\mu} is the gravitational magnification factor.
This apparent extreme star formation activity is likely explained by a highly
magnified gravitational lens system.
