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We present the first strong-lensing (SL) analysis of the galaxy clusterACT-CL J0102-4915 (\emph{El Gordo}), in recent \emph{HST}/ACS images, revealinga prominent strong lens at a redshift of $z=0.87$. This finding adds to thealready-established unique properties of \emph{El Gordo}: it is the mostmassive, hot, X-ray luminous, and bright Sunyaev-Zeldovich effect cluster at$z\gtrsim0.6$, and the only `bullet'-like merging cluster known at theseredshifts. The lens consists of two merging massive clumps, where for a sourceredshift of $z_{s}\sim2$ each clump exhibits only a small, separate criticalarea, with a total area of $0.69\pm0.11\sq\arcmin$ over the two clumps. For ahigher source redshift, $z_{s}\sim4$, the critical curves of the two clumpsmerge together into one bigger and very elongated lens (axis ratio$\simeq5.5$), enclosing an effective area of $1.44\pm0.22\sq\arcmin$. Thecritical curves continue expanding with increasing redshift so that forhigh-redshift sources ($z_{s}\gtrsim9$) they enclose an area of$\sim1.91\pm0.30\sq\arcmin$ (effective $\theta_{e}\simeq46.8\pm3.7\arcsec$) anda mass of $6.09\pm1.04\times10^{14}M_{\odot}$. According to our model, the areaof high magnification ($\mu>10$) for such high redshift sources is$\simeq1.2\sq\arcmin$, and the area with $\mu>5$ is $\simeq2.3\sq\arcmin$,making \emph{El Gordo} a compelling target for studying the high-redshiftUniverse. We obtain a strong lower limit on the total mass of \emph{El Gordo},$\gtrsim1.7\times10^{15}M_{\odot}$ from the SL regime alone, suggesting a totalmass of, roughly, $M_{200}\sim2.3\times10^{15}M_{\odot}$. Our results should berevisited when additional spectroscopic and \emph{HST} imaging data areavailable.

A highly elongated prominent lens at z=0.87: first strong lensing analysis of El Gordo