The night “Comisión de Asignación de Tiempos” (CAT) evaluates the observing proposals that guarantee to the Spanish community access to the majority of the...

We are pleased to announce the availability of Director Discretionary Time (DDT) at the 10.4m GTC facility (GTC-DDT), which includes up to 10 nights per...

Following the Agreement between IAC and NOTSA for the continued operation of the Nordic Optical Telescope, 5% of the observing time at NOT will be offered for...

Access to some telescopes is granted though specific agreements between the IAC and external institutions or consortia. The data are available to the IAC...

About 5% of the observing time in all telescopes of Roque de Los Muchachos Observatory and STELLA Robotic telescopes is also offered for International Time...