  The GRavitational lEnsing Accuracy Testing 3 (GREAT3) challenge is an image
analysis competition that aims to test algorithms to measure weak gravitational
lensing from astronomical images. The challenge started in October 2013 and
ends 30 April 2014. The challenge focuses on testing the impact on weak lensing
measurements of realistically complex galaxy morphologies, realistic point
spread function, and combination of multiple different exposures. It includes
simulated ground- and space-based data. The details of the challenge are
described in [15], and the challenge website and its leader board can be found
at http://great3challenge.info and
http://great3.projects.phys.ucl.ac.uk/leaderboard/, respectively.
