A Gravitationally Lensed Quasar Discovered in OGLE
  We report the discovery of a new gravitationally lensed quasar (double) from
the Optical Gravitational Lensing Experiment (OGLE) identified inside the
$\sim$670 sq. deg area encompassing the Magellanic Clouds. The source was
selected as one of $\sim$60 "red W1-W2" mid-IR objects from WISE and having a
significant amount of variability in OGLE for both two (or more) nearby
sources. This is the first detection of a gravitational lens, where the
discovery is made "the other way around", meaning we first measured the time
delay between the two lensed quasar images of $-132<t_{\rm AB}<-76$ days (90%
CL), with the median $t_{\rm AB}\approx-102$ days (in the observer frame), and
where the fainter image B lags image A. The system consists of the two quasar
images separated by 1.5" on the sky, with $I\approx20.0$ mag and $I\approx19.6$
mag, respectively, and a lensing galaxy that becomes detectable as $I \approx
21.5$ mag source, 1.0" from image A, after subtracting the two lensed images.
Both quasar images show clear AGN broad emission lines at $z=2.16$ in the NTT
spectra. The SED fitting with the fixed source redshift provided the estimate
of the lensing galaxy redshift of $z \approx 0.9 \pm 0.2$ (90% CL), while its
type is more likely to be elliptical (the SED-inferred and lens-model stellar
mass is more likely present in ellipticals) than spiral (preferred redshift by
the lens model).
