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While observations of many high-precision radio pulsars of order$\lesssim1~\mu$s across the sky are needed for the detection andcharacterization of a stochastic background of low-frequency gravitationalwaves (GWs), sensitivity to single sources of GWs requires even higher timingprecision. The Argentine Institute of Radio Astronomy (IAR; Instituto Argentinode Radioastronom\'ia) has begun observations of the brightest-known millisecondpulsar, J0437$-$4715. Even though the two antennas are smaller than othersingle-dish telescopes previously used for pulsar timing array (PTA) science,the IAR's capability to monitor this pulsar daily coupled with the pulsar'sbrightness allows for high-precision pulse arrival-time measurements. Whileupgrades of the facility are currently underway, we show that modestimprovements beyond current plans will provide IAR with unparalleledsensitivity to this pulsar. The most stringent upper limits on single GWsources come from the North American Nanohertz Observatory for GravitationalWaves (NANOGrav). Observations of PSR J0437$-$4715 will provide a significantsensitivity increase in NANOGrav's "blind spot" in the sky where fewer pulsarsare currently being observed. With state-of-the-art instrumentation installed,we estimate the array's sensitivity will improve by a factor of $\approx$2-4over 10 years for 20% of the sky with the inclusion of this pulsar as comparedto a static version of the PTA used in NANOGrav's most recent limits. Moremodest instrumentation result in factors of $\approx$1.4-3. We identify fourother candidate pulsars as suitable for inclusion in PTA efforts. InternationalPTA efforts will also benefit from inclusion of these data given the potentialachievable sensitivity.

Precision Timing of PSR J0437-4715 with the IAR Observatory and Implications for Low-Frequency Gravitational Wave Source Sensitivity