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The Sunyaev-Zel'dovich (SZ) effect is a spectral distortion of the cosmicmicrowave background as observed through the hot plasma in galaxy clusters.This distortion is a decrement in the CMB intensity for lambda > 1.3 mm, anincrement at shorter wavelengths, and small again by lambda ~250 um. As part ofthe Herschel Lensing Survey (HLS) we have mapped 1E0657-56 (the Bullet cluster)with SPIRE with bands centered at 250, 350 and 500 um and have detected the SZeffect at the two longest wavelengths. The measured SZ effect increment centralintensities are Delta I_{0} = 0.097 +- 0.019 MJy sr^{-1} at 350 um and DeltaI_{0} = 0.268 +- 0.031 MJy sr^{-1} at 500 um, consistent with the SZ effectspectrum derived from previous measurements at 2 mm. No other diffuse emissionis detected. The presence of the finite temperature SZ effect correction ispreferred by the SPIRE data at a significance of 2.1 sigma, opening thepossibility that the relativistic SZ effect correction can be constrained bySPIRE in a sample of clusters. The results presented here have importantramifications for both sub-mm measurements of galaxy clusters and blank fieldsurveys with SPIRE.

First detection of the Sunyaev Zel'dovich effect increment at lambda < 650 um