This work is supported in part by NASA via the Strategic University Research Partnership (SURP) Program of the Jet Propulsion Laboratory, California Institute of Technology.
The third GRavitational lEnsing Accuracy Testing challenge, or GREAT3, is a blind data analysis competition held by the world-wide weak lensing community to test weak lensing measurement algorithms.
All simulated data are available, downloadable from our server on the GREAT3 Leaderboard web site, where you can also find the scores of all the challenge participants.
The challenge began in October 2013 and ended on April 30, 2014 (see the timeline page).
With several major astronomical surveys beginning to make large-scale cosmological weak lensing measurements in 2013 in order to better understand our cosmological model (including the mysterious dark matter and dark energy), we hope this challenge will prove to have played an important role in identifying promising measurement algorithms and quantifying their performance.
For more information about the challenge, see the menu items above, particularly our links page where you can see how to access the data, submit results, get the software included with the release, and read the challenge handbook.