Data from: The low-mass dwarf host galaxy of nonrepeating FRB 20230708A

We present Very Large Telescope/X-Shooter spectroscopy for the host
galaxies of 12 fast radio bursts (FRBs) detected by the Australian SKA
Pathfinder (ASKAP), observed through the ESO Large Programme
"FURBY", which imposes strict selection criteria on the included
FRBs and their host galaxies to produce a homogeneous and well-defined
sample. We describe the data reduction and analysis of these spectra and
report their redshifts, line-emission fluxes, and derived host properties.
From the present sample, this paper focuses on the faint host of FRB (mR =
22.53 +/- 0.02) identified at low redshift (z = 0.1050). This indicates an
intrinsically very low-luminosity galaxy (L ~ 108 L_Sun), making
it the lowest-luminosity non-repeating FRB host to date by a factor of ~3,
and slightly dimmer than the lowest-luminosity host for repeating FRBs.
Our SED fitting analysis reveals a low stellar mass (M* ~ 108 MSun), low
star formation rate (SFR ~ 0.04 MSun/yr), and very low metallicity (12 +
log(O/H) ~ 8.0-8.3), distinct from the more massive galaxies (log(M/M_Sun)
~ 10) that are commonly identified for non-repeating FRBs. Its discovery
demonstrates that FRBs can arise in among the faintest, metal-poor
galaxies of the universe. In turn, this suggests that at least one FRB
progenitor channel must include stars (or their remnants) created in very
low metallicity environments. This indicates better prospects for
detecting FRBs from the high-z Universe where young, low-mass galaxies
proliferate.