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We report on the first detection of a quasi-simultaneous radio-X-ray flare ofCygnus X-1. The detection was made on 2005 April 16 with pointed observationsby the Rossi X-ray Timing Explorer and the Ryle telescope, during a phase wherethe black hole candidate was close to a transition from the its soft into itshard state. The radio flare lagged the X-rays by approximately 7 minutes,peaking at 3:20 hours barycentric time (TDB 2453476.63864). We discuss this lagin the context of models explaining such flaring events as the ejection ofelectron bubbles emitting synchrotron radiation.

Correlated radio--X-ray variability of Galactic Black Holes: A radio--X-ray flare in Cygnus X-1