  We present an analysis of data on stellar magnitudes of objects from the
GTSh10 catalogue in the SIMBAD database. To eliminate ambiguity about the state
of brightness, a comparison of stellar magnitudes from SIMBAD and NOMAD, SDSS
and VSX catalogues is carried out. It is shown that for some objects in SIMBAD
stellar magnitudes are presented in a state of high activity (possibly flare).
The detected inconsistencies must be taken into account when planning original
observations and comparing the GTSh10 data with the newly appearing surveys of
the sky.
