Between November 27, 2006, and April 1, 2007, 3329 images of the star WASP-13 by the SuperWASP-North program based at Roque de los Muchachos Observatory in the Canary Islands led to the identification of WASP-13 as host to a potentially transiting object [REF].
Later, between 2009 and 2011, another team of astronomers observed WASP-13b and WASP-21b to find what caused some Hot Jupiters to have anomalously high radii.