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We explore the properties of supernova (SN) "Refsdal" - the first discoveredgravitationally lensed SN with multiple images. A large magnification providedby the galactic-scale lens, augmented by the cluster lens, gave us a uniqueopportunity to perform a detailed modelling of a distant SN at z=1.5.  We present results of radiation hydrodynamics modelling of SN Refsdal.According to our calculations, the SN Refsdal progenitor is likely to be a moremassive and energetic version of SN 1987A, i.e. a blue supergiant star with thefollowing parameters: the progenitor radius $R_0 = (50 \pm 1) R_{\odot}$, thetotal mass $M_{tot}= (25\pm 2) M_{\odot}$, the radioactive $^{56}$Ni mass$M_{^{56}\mathrm{Ni}} = (0.26 \pm 0.05) \,M_{\odot}$, and the total energyrelease $E_{burst}=(4.7 \pm 0.8)\times10^{51}$ erg. Reconstruction of SN lightcurves allowed us to obtain time delays and magnifications for the images S2-S4relative to S1 with higher accuracy than previous template-based estimates ofRodney \& et al. (2016). The measured time delays are $\Delta t_{S2-S1} =9.5^{+2.6}_{-2.7} $ days, $\Delta t_{S3-S1} = 4.2^{+2.3}_{-2.3} $ days, and$\Delta t_{S4-S1} = 30^{+7.8}_{-8.2} $ days. The obtained magnification ratiosare $\mu_{S2/S1}= 1.14 \pm 0.02$, $\mu_{S3/S1} = 1.01 \pm 0.02 $, and$\mu_{S4/S1} = 0.35\pm 0.02$. We estimate the Hubble constant $H_0 =68.6^{+13.6}_{-9.7}$ km s$^{-1}$ Mpc$^{-1}$ via re-scaling the time delayspredicted by different lens models to match the values obtained in this work.With more photometric data on the fifth image SX, we will be able to furtherrefine the time delay and magnification estimates for SX and obtain competitiveconstraints on $H_0$.

Strongly lensed SN Refsdal: refining time delays based on the supernova explosion models