  The GLITP collaboration observed the first gravitational lens system (QSO
0957+561) from 2000 February 3 to 2000 March 31. The daily VR observations were
made with the 2.56-m Nordic Optical Telescope at Roque de los Muchachos
Observatory, La Palma (Spain). We have derived detailed and robust VR light
curves of the two components Q0957+561A and Q0957+561B. In spite of the
excellent sampling rate, we have not found evidence in favor of true daily
variability. With respect to variability on time-scales of several weeks, we
measure VR gradients of about -0.8 mmag/day in Q0957+561A and + 0.3 mmag/day in
Q0957+561B. The gradients are very probably originated in the far source, thus
adopting this reasonable hypothesis (intrinsic variability), we compare them to
the expected gradients during the evolution of a compact supernova remnant at
the redshift of the source quasar. The starburst scenario is roughly consistent
with some former events, but the new gradients do not seem to be caused by
supernova remnant activity.
