Limiting 10 keV - 100 MeV ALPs with supernovae

We use the gamma-ray signal from SN 1987A to obtain limits on massive (10 keV - 100 MeV) axion-like particles which may decay to two photons on their way to Earth. We also discuss the time and angular distribution of such a signal and estimate the possible improvements if Betelgeuse becomes a supernova. Proceedings for the talk presented by P.C.M. based entirely on Ref.~\cite{paper}, where more details can be found