We report the discovery of a new two-image gravitational lens system from the Cosmic Lens All-Sky Survey , CLASS B2319+051 .
Radio imaging with the Very Large Array ( VLA ) and Multi-Element Radio-Linked Interferometer Network ( MERLIN ) shows two compact components with a flux density ratio of \simeq 5:1 , separated by 1 \farcs 36 .
Observations with the Very Long Baseline Array ( VLBA ) resolve each of the radio components into a pair of parity-reversed subcomponents .
Hubble Space Telescope ( HST ) observations with the Near-Infrared Camera and Multi-Object Spectrometer ( NICMOS ) show a bright elliptical galaxy ( G1 ) coincident with the radio position , and a second irregular galaxy ( G2 ) 3 \farcs 4 to the northwest .
Previous spectroscopic studies have indicated that these galaxies are at different redshifts ( z _ { G 1 } = 0.624 , z _ { G 2 } = 0.588 ) .
Infrared counterparts to the lensed radio components are not detected in the NICMOS image , and the source redshift has not yet been determined .
Preliminary mass modeling based on the VLBA subcomponent data indicates that the lensing potential includes a strong external shear contribution .
A VLA monitoring program is currently being undertaken to measure the differential time delay .