The GTC project office is continuing to develop the plans for the commissioning of the GTC. The commissioning will start before first light, and will continue until well after normal science operations begin. The aim of the commissioning is to convert a series of subsystems into a single instrument which is capable of delivering high quality

Results from B and R CCD observations of the X-ray Binary system MX0656-072 High Mass X-Ray Binaries are given. No optical pulsations was found from the X-Ray Pulsar.

The advances in bolometric detector technology during the last 15 years have allowed (sub)millimetre wavelength measurements to contribute important data to some of the most challenging questions in observational cosmology. The availability of large-format filled-array cameras during the next decade, however, promises to provide FIR to millimetre

We review here the multiplicity properties of ultracool dwarfs (spectral type later than M6) observed in three different environments and at three different ages: in the field, where the objects are relatively old (1-5 Gyrs) and isolated, in the Pleiades young (˜120 Myr) open cluster, and in the young (˜5 Myr) Upper Scorpius OB association (USco)

The nearby young σ Orionis cluster (˜360 pc, ˜3 Myr) is becoming one of the most important regions for the study of ultra low-mass star formation and its extension down to the mass regimes of the brown dwarfs and planetary-mass objects. Here, I introduce the σ Orionis cluster and present three studies that the {JOVIAN} group is developing: a pilot

We present detailed simulations of the Warm-Hot Intergalactic Medium (WHIM) with the gratings of Constellation-X. Simulations are based on the extrapolation of the expected number density of OVII WHIM systems from hydrodynamical simulations of the local Universe, up to redshift of z=1 and down to an OVII column density of 1014 cm-2, and assume