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We present the results of SCUBA2 observations at 450 micron and 850 micron ofthe field lensed by the massive cluster A370. With a total survey area > 100arcmin2 and 1 sigma sensitivities of 3.92 and 0.82 mJy/beam at 450 and 850micron respectively, we find a secure sample of 20 sources at 450 micron and 26sources at 850 micron with a signal-to-noise ratio > 4. Using the latestlensing model of A370 and Monte Carlo simulations, we derive the number countsat both wavelengths. The 450 micron number counts probe a factor of four deeperthan the counts recently obtained from the Herschel Space Telescope at similarwavelengths, and we estimate that ~47-61% of the 450 micron extragalacticbackground light (EBL) resolved into individual sources with 450 micron fluxesgreater than 4.5 mJy. The faint 450 micron sources in the 4 sigma sample havepositional accuracies of 3 arcseconds, while brighter sources (signal-to-noise> 6 sigma) are good to 1.4 arcseconds. Using the deep radio map (1 sigma ~ 6uJy) we find that the percentage of submillimeter sources having secure radiocounterparts is 85% for 450 micron sources with intrinsic fluxes > 6 mJy and67% for 850 micron sources with intrinsic fluxes > 4 mJy. We also find that 67%of the > 4 sigma 450 micron sources are detected at 850 micron, while therecovery rate at 450 micron of > 4 sigma 850 micron sources is 54%. Combinedwith the source redshifts estimated using millimetric flux ratios, therecovered rate is consistent with the scenario where both 450 micron and 20 cmemission preferentially select lower redshift dusty sources, while 850 micronemission traces a higher fraction of dusty sources at higher redshifts.[Abridge]

Faint Submillimter Galaxy Counts at 450 micron