Guaranteed Time Observations
Instrument Teams Guaranteed Time Observations
JWST Guaranteed Time Observations (GTO) were allocated to each Instrument Team. The NIRISS Instrument Team received 450 h to be used over the full JWST Lifetime. The other 3 teams received 900 h each. Most GTO time will be used in Cycle 1 and some in Cycle 2.
Complete list of all GTO programs
The NIRISS Team GTO splits in two roughly 200 h programs, NEAT, focussing on exoplanets spectroscopy, and CANUCS, interested in galaxy evolution and high redshift galaxies. The remaining 50 h are small programs spanning various science goals: exoplanets observations through high-contrast imaging; investigating the initial mass function in the IC1333 star forming region; the study of brown dwarf weather.
NIRISS Exploration of Atmospheric diversity of Transiting exoplanets (NEAT)NIRISS-GTO-updated
The CAnadian NIRISS Unbiased Cluster Survey (CANUCS)Willott_NIRISSHighzWGPhase1Proposal
Early Release Science
In 2017, 13 Early Science Science (ERS) programs were selected to demonstrate the science capabilities of all JWST observing modes. These programs will be scheduled immediately after Commissioning and the data will be released publicly as it is obtained. ERS amounts to 450 h taken from the pool of Director Discretionary Time (DDT is 10% of the total JWST time). Here is a complete list of the 13 ERS programs
Other Guaranteed Time
In addition, six Interdisciplinary Scientist (IDS) who contributed since its inception to the JWST project each received 90 h of telescope time. Here are additional details from the STScI website