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The hypothetical massive dark photon ($\gamma'$) which has kinetic mixingwith the SM photon can decay electromagnetically to $e^+e^-$ pairs if its mass$m$ exceeds $2m_e$ and otherwise into three SM photons. These decays yieldcosmological and supernovae associated signatures. We briefly discuss thesesignatures, particularly in connection with the supernova SN1987A and delineatethe extra constraints that may then arise on the mass and mixing parameter ofthe dark photon. In particular, we find that for dark photon mass $m_{\gamma'}$in the 5-20 MeV range, arguments based on supernova 1987A observations lead toa bound on $\epsilon$ which is about 300 times stronger than the presentlyexisting bounds based on energy loss arguments.

Supernova Bounds on the Dark Photon Using its Electromagnetic Decay