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Roughly a dozen X-ray binaries are presently known in which the compactaccreting primary stars are too massive to be neutron stars. These primariesare identified as black holes, though there is as yet no definite proof thatany of the candidate black holes actually possesses an event horizon. Wediscuss how Type I X-ray bursts may be used to verify the presence of the eventhorizon in these objects. Type I bursts are caused by thermonuclear explosionswhen gas accretes onto a compact star. The bursts are commonly seen in manyneutron star X-ray binaries, but they have never been seen in any black holeX-ray binary. Our model calculations indicate that black hole candidates oughtto burst frequently if they have surfaces. Based on this, we argue that thelack of bursts constitutes strong evidence for the presence of event horizonsin these objects.

Evidence for the Black Hole Event Horizon