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Hemmati, S. H. Suyu, S. W. Jha, T. Broadhurst, T. Treu","submitted_at":"2017-07-08T12:54:10Z","abstract_excerpt":"A massive galaxy cluster can serve as a magnifying glass for distant stellar populations, with strong gravitational lensing exposing details in the lensed background galaxies that would otherwise be undetectable. The MACS J0416.1-2403 cluster (hereafter MACS0416) is one of the most efficient lenses in the sky, and in 2014 it was observed with high-cadence imaging from the Hubble Space Telescope (HST). Here we describe two unusual transient events that appeared behind MACS0416 in a strongly lensed galaxy at redshift $z = 1.0054 \\pm 0.0002$. 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