Archival Research icon

Guaranteed Time Observations

The JWST Guaranteed Time Observations (GTO) program  is designed to reward scientists who helped develop the key hardware and software components or technical and inter-disciplinary knowledge for the observatory. The program provides a total of about 16% use of the observatory over the first 3 cycles of operation. The approved GTO programs are listed below organized by science topic.

To view details about a specific program, select a science category below, then click the Program ID.


Archival Research

Programs with this icon have components that have no exclusive access period, and can be used as a basis for GO Cycle 1 Archival  Research (AR) Proposals.

Approved GTO Programs


For technical assistance, please contact the JWST Help Desk.


The NASA James Webb Space Telescope, developed in partnership with ESA and CSA, is operated by AURA’s Space Telescope Science Institute.