In this letter we report on the discovery of a z =2.83 Lyman- \alpha Blob ( LAB ) found in our wide field narrow-band survey within the Spitzer First Look Survey region .
The blob is extended over at least 95kpc and has a total Lyman- \alpha luminosity of 2.1 \times 10 ^ { 44 } erg s ^ { -1 } .
It is only the sixth LAB known of this scale ( > 50 kpc ) , and is associated with an embedded continuum source in g ’ , R , i ’ , K & 4.5 \mu m bands .
The LAB ’ s optical spectrum shows clumpy structures and tantalising hints of a sharp red cut-off and shear within the Ly- \alpha emission line .
Studies of the LAB ’ s surface brightness profile and of the continuum counterpart ’ s spectral energy distribution ( SED ) indicate that the profuse Lyman- \alpha emission is consistent with being powered by cold gas accreting onto a massive dark matter halo .