  The globular cluster (GC) systems of low-mass late-type galaxies, such as NGC
2403, have been poorly studied to date. As a low mass galaxy (M$_{\ast}$ = 7
$\times$ 10$^{9}$ M$_{\odot}$), cosmological simulations predict NGC 2403 to
contain few, if any, accreted GCs. It is also isolated, with a remarkably
undisturbed HI disk. Based on candidates from the literature, Sloan Digital Sky
Survey and Hyper Suprime-Cam imaging, we selected several GCs for follow-up
spectroscopy using the Keck Cosmic Web Imager. From their radial velocities,
and other properties, we identify 8 bona-fide GCs associated with either the
inner halo or the disk of this bulgeless galaxy. A stellar population analysis
suggests a wide range of GC ages from shortly after the Big Bang until the
present day. We find all of the old GCs to be metal-poor with [Fe/H] $\le$ --1.
The age--metallicity relation for the observed GCs suggests that they were
formed over many Gyr from gas with a low effective yield, similar to that
observed in the SMC. Outflows of enriched material may have contributed to the
low yield. With a total system of $\sim$50 GCs expected, our study is the first
step in fully mapping the star cluster history of NGC 2403 in both space and
time.
