The GTC observations
have discovered earlier unknown characteristics of stars and brown dwarfs in
the Sigma Orionis star cluster. The data are of high quality although some
records were taken in non-optimal weather conditions.
Members of the
collaboration Consolider-Gran Telescopio Canarias (GTC) have failed to confirm
data regarding the characteristics of ten low-mass stars and brown dwarfs
through observations made with the OSIRIS instrument of GTC.
