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We present a high-precision mass model of the galaxy clusterMACSJ1149.6+2223, based on a strong-gravitational-lensing analysis of HubbleSpace Telescope Frontier Fields (HFF) imaging data and spectroscopic follow-upwith Gemini/GMOS and VLT/MUSE. Our model includes 12 new multiply imagedgalaxies, bringing the total to 22, comprised of 65 individual lensed images.Unlike the first two HFF clusters, Abell 2744 and MACSJ0416.1-2403, MACSJ1149does not reveal as many multiple images in the HFF data. Using the Lenstoolsoftware package and the new sets of multiple images, we model the cluster withseveral cluster-scale dark-matter halos and additional galaxy-scale halos forthe cluster members. Consistent with previous analyses, we find the system tobe complex, composed of five cluster-scale halos. Their spatial distributionand lower mass, however, makes MACSJ1149 a less powerful lens. Our best-fitmodel predicts image positions with an RMS of 0.91". We measure the totalprojected mass inside a 200~kpc aperture as ($1.840\pm 0.006$)$\times10^{14}$M$_{\odot}$, thus reaching again 1% precision, following our previousHFF analyses of MACSJ0416.1-2403 and Abell 2744. In light of the discovery ofthe first resolved quadruply lensed supernova, SN Refsdal, in one of themultiply imaged galaxies identified in MACSJ1149, we use our revised mass modelto investigate the time delays and predict the rise of the next image betweenNovember 2015 and January 2016.

Hubble Frontier Fields: Predictions for the Return of SN Refsdal with the MUSE and GMOS Spectrographs