  GINGERINO is a square ring-laser prototype, which has been built to
investigate the level of noise inside the Gran Sasso underground laboratory. It
Is meant for fundamental physics, but it provides suitable data for geophysics
and seismology. Since May 2017 it is continuously acquiring data. The analysis
of the first $90$ days shows that the duty cycle is higher than $95\%$, and the
quantum shot noise limit is of the order of $
10^{-10}(\mathrm{rad}/s)/\sqrt{\mathrm{Hz}}$. It is located in a seismically
active area, and it recorded part of the of central Italy earthquakes. Its high
sensitivity in the frequency band of fraction of Hz makes it suitable for
seismology studies. The main purpose of the present analysis is to investigate
the long term response of the apparatus. Simple and fast routines to eliminate
the disturbances coming from the laser have been developed. The Allan deviation
of the raw data reaches $10^{-7}$ after about $10^6s$ of integration time,
while the processed data shows an improvement of one order of magnitude.
Disturbances at the daily time scale are present in the processed data and the
expected signal induced by polar motion and solid Earth tide is covered by
those disturbances.
