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We report Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) deep IR(F160W) imaging of SDSS J1608+2716. This system, located at a redshift ofz=2.575, was recently reported as a triple quasar candidate with subarcsecondseparations ($\sim0.25''$) based on selection from Gaia astrometry andfollow-up Keck adaptive optics-assisted integral field unit spectroscopy. Ournew HST deep IR imaging reveals the presence of a fourth point-like componentlocated $\sim0.9''$ away from the triple system. Additionally, we detect anedge-on disk galaxy located in between the four point sources. The entiresystem exhibits a characteristic cusp structure in the context of stronggravitational lensing, and the observed image configuration can be successfullyreproduced using a lens model based on a singular isothermal ellipsoid massprofile. These findings indicate that this system is a quadruply lensed quasar.Our results highlight the challenges associated with identifying dual/multiplequasars on $\sim$kpc scales at high redshifts, and emphasize the crucial roleof deep, high-resolution IR imaging in robustly confirming such systems.

Varstrometry for Off-nucleus and Dual sub-Kpc AGN (VODKA). SDSS J1608+2716: A Sub-arcsec Quadruply Lensed Quasar at z=2.575