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A nonlinear kinetic theory, combining cosmic-ray (CR) acceleration insupernova remnants (SNRs) with their gas dynamics, is used to re-examine thenonthermal properties of the remnant of SN 1987A for an extended evolutionaryperiod of 5-50 yr. This spherically symmetric model is approximately applied tothe different features of the SNR which consist of (i) a blue supergiant windand bubble, and (ii) of the swept-up red supergiant (RSG) wind structures inthe form of an H II region, an equatorial ring (ER), and an hourglass region.The RSG wind involves a mass loss rate that decreases significantly withelevation above and below the equatorial plane. The model adapts recentthree-dimensional hydrodynamical simulations by Potter et al. in 2014 that usea significantly smaller ionized mass of the ER than assumed in the earlierstudies by the present authors. The SNR shock recently swept up the ER, whichis the densest region in the immediate circumstellar environment. Therefore,the expected gamma-ray energy flux density at TeV energies in the current epochhas already reached its maximal value of $\sim 10^{-13}$ erg cm$^{-2}$s$^{-1}$. This flux should decrease by a factor of about two over the next 10years.

Re-examination of the Expected gamma-ray emission of supernova remnant SN 1987A