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The recently reported observation of VFTS 243 is the first example of amassive black-hole binary system with negligible binary interaction followingblack-hole formation. The black-hole mass ($\approx 10\ M_{\odot}$) andnear-circular orbit ($e\approx 0.02$) of VFTS 243 suggest that the progenitorstar experienced complete collapse, with energy-momentum being lostpredominantly through neutrinos. VFTS 243 enables us to constrain the natalkick and neutrino-emission asymmetry during black-hole formation. At 68% C.L.,the natal kick velocity (mass decrement) is $\lesssim 10$ km/s ($\lesssim 1.0\M_{\odot}$). Most likely $\approx 0.3\ M_{\odot}$ were ejected, presumably inneutrinos, and the black hole experienced a natal kick of $4$ km/s. Theneutrino-emission asymmetry is $\lesssim 4$%, with best fit values of$\sim$0-0.2%. Such a small neutrino natal kick accompanying black-holeformation is in agreement with theoretical predictions.

Observational evidence for neutrino natal kicks from black-hole binary VFTS 243