Axions from SN1987A.

Axion emission from SN1987A by nucleon-nucleon axion bremsstrahlung is considered. On the basis of the neutrino observations the axion luminosity must be approx. 2.2 eV. In general, ''axion trapping'' occurs for m/sub a/approx. >0.016 eV. Our mass constraints are at best reliable to within a factor of approx. =3.