Exploring the Optical Transient Sky with the Palomar Transient Factory by Rau, A, Kulkarni, SR, Law, N, Bloom, J, Ciardi, D, Djorgovski, G, Fox, D, Gal-Yam, A, Grillmair, C, Kasliwal, M, Nugent, P, Ofek, E, Quimby, R, Reach, W, Shara, M, Bildsten, L, Cenko, S, Drake, A, Filippenko, A, Helfand, D, Helou, G, Howell, D, Poznanski, D, Sullivan, M