  A new water-Cherenkov radiation detector, located at the Argentine Marambio
Antarctic Base (64.24S-56.62W), has been monitoring the variability of galactic
cosmic ray (GCR) flux since 2019. One of the main aims is to provide
experimental data necessary to study interplanetary transport of GCRs during
transient events at different space/time scales. In this paper we present the
detector and analyze observations made during one full year. After the analysis
and correction of the GCR flux variability due to the atmospheric conditions
(pressure and temperature), a study of the periodicities is performed in order
to analyze modulations due to heliospheric phenomena. We can observe two
periods: (a) 1 day, associated with the Earth's rotation combined with the
spatial anisotropy of the GCR flux; and (b) $\sim$ 30 days due to solar impact
of stable solar structures combined with the rotation of the Sun. From a
superposed epoch analysis, and considering the geomagnetic effects, the mean
diurnal amplitude is $\sim$ 0.08% and the maximum flux is observed in $\sim$ 15
hr local time (LT) direction in the interplanetary space. In such a way, we
determine the capability of Neurus to observe anisotropies and other
interplanetary modulations on the GCR flux arriving at the Earth.
