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Because follow-up observations of quadruple gravitational lens systems are ofextraordinary importance for astrophysics and cosmology, we presentsingle-epoch optical spectra and $r$--band light curves of PS J0147+4630. Thisrecently discovered system mainly consists of four images ABCD of a backgroundquasar around a foreground galaxy G that acts as a gravitational lens. First,we use long--slit spectroscopic data in the Gemini Observatory Archive and amulti-component fitting to accurately resolve the spectra of A, D, and G. Thespectral profile of G resembles that of an early-type galaxy at a redshift of0.678 $\pm$ 0.001, which is about 20\% higher than the previous estimate.Additionally, the stellar velocity dispersion is measured to $\sim$5\%precision. Second, our early $r$-band monitoring with the Liverpool Telescopeleads to accurate light curves of the four quasar images. Adopting time delayspredicted by the lens model, the new lens redshift, and a standard cosmology,we report the detection of microlensing variations in C and D as large as$\sim$0.1 mag on timescales of a few hundred days. We also estimate an actualdelay between A and B of a few days (B is leading), which demonstrates the bigpotential of optical monitoring campaigns of PS J0147+4630.

Gravitational Lens System PS J0147+4630 (Andromeda's Parachute): Main Lensing Galaxy and Optical Variability of the Quasar Images