2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/13515GX 339-4 is an unusual black hole candidate in that it is a persistent source, being detected by X-ray telescopes most of the time, but it also has nova-like flaring states. In 1996 we performed radio, optical, X-ray, and gamma-ray observations of GX 339-4 when it was in a hard state (= soft X-ray low state). Here we present a brief summary of some of the results.To appear in Astrophysical Letters and Communications: 3rd INTEGRAL Workshop proceedings. 4 pages. 0 figuresAstrophysicstext