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Stairs, James M. Cordes, Jing Luo, Joseph K. Swiggum, Joseph Simon, Justin A. Ellis, Kathryn Crowter, Kevin Stovall, Lina Levin, Maura A. McLaughlin, Megan E. DeCesar, Megan L. Jones, Michael T. Lam, Michele Vallisneri, Nathan Garver-Daniels, Neil J. Cornish, Paul B. Demorest, Paul S. Ray, Peter A. Gentile, Renee Spiewak, Robert D. Ferdman, Rutger van Haasteren, Ryan S. Lynch, Sarah Burke-Spolaor, Sarah J. Vigeland, Scott M. Ransom, Sean T. McWilliams, Shami Chatterjee, Stephen R. Taylor, Sydney Chamberlin, Timothy Dolch, Timothy T. Pennucci, T. Joseph W. Lazio, Weiwei Zhu, Xavier Siemens, Zaven Arzoumanian","submitted_at":"2017-12-24T01:44:26Z","abstract_excerpt":"We present high-precision timing data over time spans of up to 11 years for 45 millisecond pulsars observed as part of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) project, aimed at detecting and characterizing low-frequency gravitational waves. 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