Riding the Wave, from Inside Higher Education, reports on publishing decisions surrounding the gravitation wave story by the Laser Interferometer Gravitational-Wave Observatory (LIGO) scientists. They voted on where to publish and chose Physical Review Letters. Later this was shared by CalTech librarian Gail Clement on a library discussion list:
As a side note, when the APS went down on the day of the gravitational waves announcement due to excessively heavy traffic to Physical Review Letters, the Caltech Repository offered mirror access and the Caltech strategic communications staff used our repository copy in all press releases, advising “Because the journal’s website is being slammed, it turns out the Caltech library’s page for the paper is a more accessible source for the PDF version.”
Observation of Gravitational Waves from a Binary Black Hole Merger Open access at Physical Review Letters with a Creative Commons Attribution 3.0 License.