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 semester. To be eligible for GTC-DDT time, a

DDT proposals are accepted for every night allocated as Service Time on the NOT, TNG, and INT. For the WHT, DDT nights are scheduled exclusively as CAT DDT (see available nights below). Full and half

Up to 2.5% of the GTC observing time is reserved for collaborative proposals between Spanish and Mexican astronomers. To send proposals under this agreement, select the corresponding Special Agreement