The A²∏_u-X²∑_g⁺ system of N₂⁺ was first observed in auroral emissions by Meinel in 1950.  Although the N₂⁺ band system has been reinvestigated since this first spectral study, no laboratory spectrum of the 2-1 vibronic band has been obtained.  We have recently built a continuous-wave cavity ringdown spectrometer, and as a first test of this spectrometer we observed the 2-1 band of N₂⁺ in a positive column discharge cell.  In the process of assigning this spectrum many lines of the first positive band system of N₂^* were also identified.  The relative intensities of the N₂^* and N ₂⁺ bands were found to change with discharge cell pressure, and so each spectral region was observed at two pressures to aid in distinguishing the spectra of the two species.  We improved previous predictions of the molecular constants by obtaining a fit for both of these species and will present these results.