Gelbord, J MMarshall, H LWorrall, D MBirkinshaw, MLovell, J E JOjha, RGodfrey, LeithSchwartz, D APerlman, E SGeorganopolous, MMurphy, D WJauncey, David L2015-12-130004-637Xhttp://hdl.handle.net/1885/84883We report the discovery of unusually strong optical and X-ray emission associated with a knot in the radio jet of PKS B1421-490. The knot is the brightest feature observed beyond the radio band, with knot/core flux ratios ∼300 and 3.7 at optical and X-rKeywords: Galaxies: jets; Quasars: individual (pks b1421-490)200510.1086/4978232015-12-12