The Great-3 challenge is now complete and the winners decided. You can continue to use the Great-3 site to characterize your methods by submitting entries to the post-challenge leader-boards instead.

Welcome to the Great3 Leaderboard

Great3 is a data analysis challenge for Weak Gravitational Lensing cosmology. Participants are given a large number of simulated images of distant galaxies and are challenged to compute and submit statistics about the underlying distortions that have affected the images.


This site is where challenge data can be downloaded and results submitted. For information on the challenge, see these sources:

Getting Started

Get the data

See the leaderboards (or submit a new entry to one of them)

See the teams

Team sFIT has won GREAT3 with 80001 points (on a tiebreak)!