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We report the results of multiwavelength observations of the superluminalX-ray transient GRO J1655-40 during and following the prominent hard X-rayoutburst of March-April 1995. GRO J1655-40 was continuously monitored by BATSEon board CGRO, and repeatedly observed in the radio and optical bands from theground. About a month after the onset of the hard X-ray outburst, GRO J1655-40was observed twice by HST on April 25 and 27 1995, with the aim of detectingfaint optical emission from ejected plasmoids. Despite the similarity of thehard X-ray emission in April 1995 with previous events in 1994, no radio oroptical emission related to plasmoids was detected. We conclude that GROJ1655-40 is subject to a complex behavior showing: radio-loud hard X-rayoutbursts with strong radio emission (of flux $f_r \goe 100$~mJy) both from a`core' source and from propagating plasmoids (as those in 1994), andradio-quiet hard X-ray outbursts with no detectable radio emission and plasmoidactivity ($f_r \loe 0.5$~mJy) (as those in 1995). Our results can constrainmodels of particle acceleration and radiation of relativistic plasmoids.Comment: 11 pages, one figure included as postscript file. One additional  figure available on request from tavani@meleas.phys.columbia.edu, to appear  in Astrophysical Journal Letter

The Dual Nature of Hard X-Ray Outbursts from the Superluminal X-Ray Transient Source GRO J1655−40