GX 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.
S. B. Cenko, H. A. Krimm, A. Horesh, A. Rau, D. A. Frail, J. A. Kennea, A. J. Levan, S. T. Holland, N. Butler, R. Quimby, J. S. Bloom, Alexei V Filippenko, A. Gal‐Yam, J. Greiner, S. R. Kulkarni, E. O. Ofek, F. Olivares, P. Schady, J. M. Silverman, N. R. Tanvir, D. Xu
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