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We have studied the future evolution of a recently discovered ULX source P13in NGC7793. This source was shown to contain a 5-15$M_{\odot}$ black hole and amassive 18-23$M_{\odot}$ B9Ia companion on a 64 day orbit. For low black holemass (5-10$M_{\odot}$) and high companion mass $\gtrsim 20 M_{\odot}$ thebinary is predicted to initiate a common envelope evolution in near future andsignificantly decrease the orbital separation (6 hr orbit). This leads to ahigh probability ($\sim70\%$) of the system surviving a supernova explosionthat will form a neutron star out of the companion. About one third of thesurviving BH-NS systems will merge within Hubble time and be a source of highfrequency gravitational radiation. We estimate that the chances of detection ofBH-NS systems with advanced LIGO/Virgo that form via P13-evolutionary channelare at the level of 0.1 yr$^{-1}$ with wide range of allowed probability $0\div 0.6$yr$^{-1}$. This is the fourth empirical estimate of BH-NS merger rate.

P13 an ULX that is a potential progenitor of merging BH-NS system