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We report lensing magnifications, extinction, and time-delay estimates forthe first resolved, multiply-imaged Type Ia supernova iPTF16geu, at $z =0.409$, using $Hubble\,Space\,Telescope$ ($HST$) observations in combinationwith supporting ground-based data. Multi-band photometry of the resolved imagesprovides unique information about the differential dimming due to dust in thelensing galaxy. Using $HST$ and Keck AO reference images taken after the SNfaded, we obtain a total lensing magnification for iPTF16geu of $\mu =67.8^{+2.6}_{-2.9}$, accounting for extinction in the host and lensing galaxy.As expected from the symmetry of the system, we measure very short time-delaysfor the three fainter images with respect to the brightest one: -0.23 $\pm$0.99, -1.43 $\pm$ 0.74 and 1.36 $\pm$ 1.07 days. Interestingly, we find largedifferences between the magnifications of the four supernova images, even afteraccounting for uncertainties in the extinction corrections: $\Delta m_1 =-3.88^{+0.07}_{-0.06}$, $\Delta m_2 = -2.99^{+0.09}_{-0.08}$, $\Delta m_3 =-2.19^{+0.14}_{-0.15}$ and $\Delta m_4 = -2.40^{+0.14}_{-0.12}$ mag, discrepantwith model predictions suggesting similar image brightnesses. A possibleexplanation for the large differences is gravitational lensing bysubstructures, micro- or millilensing, in addition to the large scale lenscausing the image separations. We find that the inferred magnification isinsensitive to the assumptions about the dust properties in the host and lensgalaxy.

Magnification, dust and time-delay constraints from the first resolved strongly lensed Type Ia supernova