Your link is not correct. The correct link is below. It ends with jsoncallback.
http://api.flickr.com/services/rest/?method=flickr.photos.search&api_key=bde2ddde05dd5e7abbc7a44b9abc12ef&tags=gtav%2C+grand+theft+auto%2C++rockstar&bbox=-122.65057757118905%2C37.71174524790033%2C-122.2214241288068%2C37.81705186562751+&format=json&jsoncallback=?