  Observational data from the Fermi Gamma-ray Space Telescope are analyzed with
a goal in mind to look for variations in gamma-ray flux from young shell-like
supernova remnants. Uniform methodological approach is adopted for all SNRs
considered. G1.9+0.3 and Kepler SNRs are not detected. The light curves of
Cas~A and Tycho SNRs are compatible with the steady GeV flux during the recent
ten years, as also X-ray and radio fluxes. Less confident results on SN1006 and
SN1987A are discussed.
