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A modification of the relation between axion mass and the PQ constant per- mits a relaxation of the astrophysical constraints, considerably enlarging the allowed axion parameter space. We develop this idea in this paper, discussing a model for an ultramassive axion, which essentially represents a supersymmetric Weinberg-Wilczek axion of the mirror world. The experimental and astrophysical limits allow a PQ scale fa ∼ 104 −106 GeV and a mass ma ∼ MeV, which can be accessible for future experiments.\udOn a phenomenological ground, such an ultramassive axion turns out to be quite inter- esting. It can be produced during the gravitational collapse or during the merging of two compact objects, and its subsequent decay into e+e− provides an efficient mechanism for the transfer of the gravitational energy of the collapsing system to the electron-positron plasma. This could resolve the energy budget problem in the Gamma Ray Bursts and also help in understanding the SN type-II explosion phenomena

Mirror World, Supersymmetric Axion and Gamma Ray Bursts