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The proto-galaxy, cB58, was discovered in the CNOC survey of clusterredshifts. Absorption features reveal that this system is at a redshift of$z=2.72$, implying an absolute magnitude of ${\rm M_v \sim -26}$, and astar-formation rate of $4700 {\rm M_{\odot} yr^{-1}}$, making it the most``active'' star-forming galaxy. This proto-galaxy is observed to lie close$\left(\sim 6\scnp\right)$ to a central cluster galaxy at $z=0.373$. The X-rayproperties of the cluster suggest that its mass, and therefore its lensingpotential, could be greater than that found using a virial analysis. In thisLetter we argue that the phenomenal properties of this proto-galaxy are due tothe gravitational lensing effect of the foreground cluster, and the unlensedproperties of the source are typical of high-redshift star-forming systems.Comment: 4 pages, Submitted to MNRAS Letter

The giant protogalaxy cB58: an artefact of gravitational lensing?