The observations from the Dark Energy Spectroscopic Instrument (DESI) will
significantly increase the numbers of known extremely metal-poor stars by a
factor of ~ 10, improving the sample statistics to study the early chemical
evolution of the Milky Way and the nature of the first stars. In this paper we
report high signal-to-noise follow-up observations of 9 metal-poor stars
identified during the DESI commissioning with the Optical System for Imaging
and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) instrument on
the 10.4m Gran Telescopio Canarias (GTC). The analysis of the data using a
well-vetted methodology confirms the quality of the DESI spectra and the
performance of the pipelines developed for the data reduction and analysis of
DESI data.Comment: 13 pages, 4 figures, to be submitted to ApJ, data available from
https://doi.org/10.5281/zenodo.802084