The international pulsar timing array: first data release

J. P W Verbiest, L. Lentati, George B Hobbs, Rutger van Haasteren, P. B. Demorest, G. H. Janssen, J.-B. Wang, G Desvignes, R. N. Caballero, M. J. Keith, Paul J Champion de Crespigny, Z. Arzoumanian, Stanislav Babak, C G Bassa, N. D R Bhat, A. Brazier, P. Brem, M Burgay, Sarah Burke-Spolaor, Sydney JoAnne ChamberlinPaul Lasky, Daniel Reardon, Pablo Rosado, Xingjiang Zhu