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Thankful Cromartie, Ingrid H. Stairs, Jacob E. Turner, James M. Cordes, Jeffrey S. Hazboun, Jerry P. Sun, Jing Luo, Joey Shapiro Key, Joseph K. Swiggum, Joseph Simon, Justin A. Ellis, Kathryn M. Zurek, Kevin Stovall, Kristina Islo, Luke Zoltan Kelley, Maria Charisi, Maura A. McLaughlin, Megan E. DeCesar, Megan L. Jones, Michael T. Lam, Michele Vallisneri, Nathan Garver-Daniels, Neil J. Cornish, Nihan S. Pol, Nima Laal, Paul B. Demorest, Paul R. Brook, Paul S. Ray, Paul T. Baker, Peter A. Gentile, Ren\\'ee Spiewak, Ross J. Jennings, Ryan S. Lynch, Sarah Burke-Spolaor, Sarah J. Vigeland, Scott M. Ransom, Shami Chatterjee, Siyuan Chen, Stephen R. Taylor, Timothy Dolch, Timothy T. Pennucci, T. Joseph W. Lazio, Vincent S. H. Lee, William Fiore, Xavier Siemens, Zaven Arzoumanian","submitted_at":"2021-04-28T18:00:01Z","abstract_excerpt":"We search for a first-order phase transition gravitational wave signal in 45 pulsars from the NANOGrav 12.5 year dataset. 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