The HST General Observer proposal process is divided into two Phases. Phase I proposals contain a scientific justification and abbreviated technical specifications for review by the Telescope Allocation Committee in a particular Cycle. Phase II proposals provide many more technical details for programmes recommended by the TAC and approved by the STScI Director for implementation. The information required by proposers in Phases I and II is provided in the documents below.

Describing the Call for proposals and the Phase I proposal instructions.

Phase II Instructions

Describing how to prepare and submit a Phase II proposal.