An Update on NANOGrav's Growing Pulsar Timing Data Set*

The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration has finalized its 15-Year Data Release, marking an exciting milestone for pulsar timing arrays and low-frequency gravitational wave detection. Since the publication of our 12.5-year data release, which strongly suggested the presence of a common red noise process in NANOGrav's millisecond pulsar (MSP) timing data, we have added 21 new MSPs and 3 years of data. This expansion will not only improve our gravitational wave background sensitivity, but will also necessitate the creation of a purpose-built pipeline based on modern pulsar timing software. This talk will touch on the improvements between our 12.5 and 15-year data releases, the development of our pipeline, the evolution of our observing program, and exciting synergistic science results. NANOGrav's participation in the International Pulsar Timing Array's Third Data Release effort, as well as what lies on the horizon for pulsar timing array experiments, will also be discussed.