We report on the status of the Canarias InfraRed Camera Experiment (CIRCE), a near-infrared visitor instrument for the 10.4 meter Gran Telescopio Canarias (GTC). Besides functioning as a 1-2.5 micron imager with a 3.4×3.4 arcminute field-of-view and 0.10 arsecond pixels, CIRCE will have the capacity for low and moderate resolution grism

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We present a study of the radial distribution of RR Lyrae variables, which present a range of photometric and pulsational properties, in the dwarf spheroidal galaxy Tucana. We find that the fainter RR Lyrae stars, having a shorter period, are more centrally concentrated than the more luminous, longer period RR Lyrae variables. Through comparison

Coordinates, redshifts, SDSS (ugriz) and 2MASS (JHK) photometry, IRAC and MIPS fluxes for the 278 SWIRE/SDSS quasars in the SWIRE EN1, EN2 and Lockman fields, ordered by RA. (2 data files).

Coordinates, redshifts, SDSS (ugriz) and 2MASS (JHK) photometry, IRAC and MIPS fluxes for the 278 SWIRE/SDSS quasars in the SWIRE EN1, EN2 and Lockman fields, ordered by RA. (2 data files).

We present results from Hubble Space Telescope ultraviolet spectroscopy of the massive X-ray and black hole binary system, HD 226868 = Cyg X-1. The spectra were obtained at both orbital conjunction phases in 2002 and 2003, when the system was in the X-ray high/soft state. The UV stellar wind lines suffer large reductions in absorption strength when