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GRavitational lEnsing Accuracy Testing 2010 (GREAT10) is a public imageanalysis challenge aimed at the development of algorithms to analyzeastronomical images. Specifically, the challenge is to measure varying imagedistortions in the presence of a variable convolution kernel, pixelization andnoise. This is the second in a series of challenges set to the astronomy,computer science and statistics communities, providing a structured environmentin which methods can be improved and tested in preparation for plannedastronomical surveys. GREAT10 extends upon previous work by introducingvariable fields into the challenge. The "Galaxy Challenge" involves the precisemeasurement of galaxy shape distortions, quantified locally by two parameterscalled shear, in the presence of a known convolution kernel. Crucially, theconvolution kernel and the simulated gravitational lensing shape distortionboth now vary as a function of position within the images, as is the case forreal data. In addition, we introduce the "Star Challenge" that concerns thereconstruction of a variable convolution kernel, similar to that in a typicalastronomical observation. This document details the GREAT10 Challenge forpotential participants. Continually updated information is also available fromhttp://www.greatchallenges.info.

Gravitational Lensing Accuracy Testing 2010 (GREAT10) Challenge Handbook