GTO

Guaranteed Time Observation Programs

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.

Archival Research

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

Cycle 2 GTO Programs

ID	Program Title	Principal Investigator	Instrument/Mode	Allocated Hours
2757	Understanding the Origin of Boyajian's Star Occultations	Massimo Stiavelli	NIRSpec/FS MIRI/LRS MIRI/Imaging	5.0
2758	NIRSpec MSA Observations of Galaxies in a Parallel Field	Massimo Stiavelli	NIRSpec/MOS	30.0
2759	NIRISS Exploration of the Atmospheric Diversity of Transiting Exoplanets (NEAT)	David Lafreniere	NIRISS/SOSS	10.0
2760	Titan Surface and Atmosphere - JWST Cycle 2 GTO Project	Jonathan Lunine	NIRSpec/IFU MIRI/MRS	13.8
2763	SN 1987A: The Formation and Evolution of Dust in a Supernova Explosion	Margaret Meixner	MIRI/MRS	6.0
2768	Uranus High Spatial Resolution Global Map from NIRCam	Naomi Rowe-Gurney	NIRCam/Imaging	4.4
2770	Brown Dwarfs and Free-floating Planetary Mass Objects in Orion: Spectroscopy	Mark McCaughrean	NIRSpec/MOS	20.0
2771	Structure, Excitation, and Proper Motions in the Symmetric HH212 Jet: Epoch 2	Mark McCaughrean	TBD	7.0
2772	Galactic Center Astrometry	Roeland van der Marel	NIRCam/Imaging	1.6
2773	Deciphering the Extended Dust and Gas Environment of the Archetypal Type-1 AGN in NGC 4151 with JWST	Jianwei Lyu	MIRI/MRS	5.9
2774	The Environment of ULAS J1120+0641	George Rieke	NIRCam/Imaging	8.1
2775	A Census of Star Formation and Early Quenching in a High-z Galaxy Cluster	Stacey Alberts	NIRCam/Imaging	3.5
2778	Imaging Spectroscopy of the Coldest Imaged Exoplanet and a Low-Mass Accreting Protoplanet	Marshall Perrin	NIRSpec/IFU MIRI/MRS	7.5
2780	Coronagraphic Imaging of Scattered light Debris Disks - Cycle 2	Andras Gaspar	NIRCam/Coronagraphy	28.0

Cycle 1 GTO Programs

The approved GTO programs in Cycle 1 are organized by science topic. To view details about a specific program, select a science category below, then click the Program ID.

Brown Dwarfs

ID	Program Title	Principal Investigator	Instrument
1189	NIRCam Y-Dwarfs	Thomas Roellig	MIRI NIRCam NIRISS NIRSpec
1202	The NIRISS Survey for Young Brown Dwarfs and Rogue Planets	Aleks Scholz	NIRISS
1209	Probing the Cloud Properties of SIMP0136+0933	Etienne Artigau	NIRISS
1228	The Physics of Brown Dwarfs - Part #1	Catarina Alves de Oliveira	NIRSpec
1229	The Physics of Brown Dwarfs - Part #2	Catarina Alves de Oliveira	NIRCam NIRSpec
1230	The Physics of Brown Dwarfs - Part #3	Catarina Alves de Oliveira	MIRI NIRCam NIRISS NIRSpec
1256	Brown Dwarfs and Free-floating Planetary Mass Objects in Orion: Imaging	Mark McCaughrean	NIRCam
1413	MIRI Coronagraphy of the Cold Substellar Companion GJ 758 B	Laurent Pueyo	MIRI
1414	Integral Field Spectroscopy of the Benchmark Substellar Companion HD 19467 B	Marshall Perrin	NIRSpec

Clusters of Galaxies

ID	Program Title	AR?	Principal Investigator	Instrument
1199	The Metallicity of Galaxies in the MAC J1149.5+2223 Field		Massimo Stiavelli	NIRCam NIRSpec
1208	CANUCS: The CAnadian NIRISS Unbiased Cluster Survey		Chris Willott	NIRCam NIRISS NIRSpec

Debris Disks and Photodissociation Regions

ID	Program Title	Principal Investigator	Instrument
1183	Coronagraphic Imaging of Scattered light Debris Disks	Andras Gaspar	NIRCam NIRSpec
1192	Physics and Chemistry of PDR Fronts	Karl Misselt	MIRI NIRCam NIRSpec
1206	Extreme Debris Disks and Disk Variability	George Rieke	MIRI
1282	MIRI EC Protoplanetary and Debris Disks Survey	Thomas Henning	MIRI NIRSpec
1294	Thermal Emission Spectroscopy of Beta Pictoris' Prototypical Debris Disk	Christine Chen	MIRI
1411	Coronagraphy of the Debris Disk Archetype Beta Pictoris	Christopher Stark	MIRI NIRCam

Deep Fields

ID	Program Title	Principal Investigator	Instrument
1180	NIRCam-NIRSpec Galaxy Assembly Survey - GOODS-S - Part #1	Daniel Eisenstein	NIRCam NIRSpec
1181	NIRCam-NIRSpec Galaxy Assembly Survey - GOODS-N	Daniel Eisenstein	NIRCam NIRSpec
1207	MIRI in the Hubble Ultra-Deep Field	George Rieke	MIRI NIRSpec
1210	NIRCam-NIRSpec Galaxy Assembly Survey - GOODS-S - Part #1	Pierre Ferruit	NIRSpec
1211	NIRSpec WIDE MOS Survey - GOODS-N	Pierre Ferruit	NIRSpec
1213	WIDE MOS Survey - AEGIS	Pierre Ferruit	NIRSpec
1214	NIRSpec WIDE MOS Survey - COSMOS	Pierre Ferruit	NIRSpec
1215	NIRSpec WIDE MOS Survey - UDS	Pierre Ferruit	NIRSpec
1216	Integral Field Spectroscopy in GOODS-S	Pierre Ferruit	NIRSpec
1217	Integral Field Spectroscopy in COSMOS	Pierre Ferruit	NIRSpec
1262	Integral Field Spectroscopy in EGS	Pierre Ferruit	MIRI NIRSpec
1263	NIRSpec and MIRI Spectroscopy of QSOs - Part 2	Luis Colina Robledo	MIRI NIRSpec
1283	The MIRI HUDF Deep Imaging Survey	H.U. Norgaard-Nielsen	MIRI
1284	MIRI IFS of COS-zs7-1	Luis Colina Robledo	MIRI
1286	NIRCam-NIRSpec Galaxy Assembly Survey - GOODS-S - Part #2	Pierre Ferruit	NIRSpec
1287	NIRCam-NIRSpec Galaxy Assembly Survey - GOODS-S - Part #3	Pierre Ferruit	NIRSpec

Extra-solar Planets

ID	Program Title	Principal Investigator	Instrument
1177	MIRI Observations of Transiting Exoplanets	Thomas Greene	MIRI
1184	Survey of Nearby Young M Stars	Joshua Schlieder	NIRCam
1185	Transit Spectroscopy of Mature Planets	Thomas Greene	NIRCam
1188	Direct Spectroscopy of Non-transiting Exoplanets	Klaus Hodapp	MIRI NIRSpec
1193	Coronagraphic Imaging of Young Planets and Debris Disk with NIRCam and MIRI	Charles Beichman	MIRI NIRCam
1194	Characterization of the HR 8799 Planetary System and Planet Search	Charles Beichman	MIRI NIRCam
1195	Coronagraphic Imaging of Young Planets - Part 3	Charles Beichman	NIRCam
1200	Architecture of Directly-imaged Extrasolar Planetary Systems	Julien Rameau	NIRISS
1201	NIRISS Exploration of the Atmospheric Diversity of Transiting Exoplanets (NEAT)	David Lafreniere	NIRISS NIRSpec
1224	Transiting Exoplanet Characterization with JWST/NIRSPEC	Stephan Birkmann	NIRSpec
1241	MIRI Coronagraphic Imaging of Exoplanets	Michael Ressler	MIRI
1270	Characterizing the TWA 27 System	Stephan Birkmann	MIRI NIRSpec
1274	Extrasolar Planet Science with JWST	Jonathan Lunine	NIRCam
1275	Spectroscopic Characterization of PSO J318	Pierre-Olivier Lagage	MIRI NIRSpec
1276	Spectroscopic Observations of WD 0806-661B	Pierre-Olivier Lagage	MIRI NIRCam NIRSpec
1277	Coronographic Observations of Young Exoplanets and Spectroscopic Observations of ROSS 458 ABc	Pierre-Olivier Lagage	MIRI NIRSpec
1278	MIRI Spectroscopic Observations of Brown Dwarfs	Pierre-Olivier Lagage	MIRI
1279	Thermal Emission from Trappist1-b	Pierre-Olivier Lagage	MIRI
1280	MIRI Transiting Observation of WASP-107b	Pierre-Olivier Lagage	MIRI
1281	MIRI and NIRSPEC Transit Observations of HAT-P-12 b	Pierre-Olivier Lagage	MIRI NIRSpec
1292	ROSS 458 ABc	Jonathan Lunine	NIRSpec
1312	Transit and Eclipse Spectropscopy of a Warm Neptune	Nikole Lewis	MIRI NIRISS NIRSpec
1331	Transit Spectroscopy of TRAPPIST-1e	Nikole Lewis	NIRSpec
1353	Transit and Eclipse Spectropscopy of a Hot Jupiter	Nikole Lewis	MIRI NIRISS NIRSpec
1412	Characterizing 51 Eridani Exoplanetary System	Marshall Perrin	NIRCam

High-redshift Quasars and Galaxy Assembly

ID	Program Title	Principal Investigator	Instrument
1198	IFU Spectroscopy of the Host Galaxies of Strongly Lensed Quasars	Massimo Stiavelli	NIRCam NIRSpec
1205	Formation Histories and Stellar Masses of Very High-z Quasars	George Rieke	NIRCam NIRSpec
1218	NIRSpec-IFU Observations of Two QSOs at z=6	Pierre Ferruit	NIRSpec
1219	NIRSpec and MIRI spectroscopy of QSOs - part #3	Pierre Ferruit	MIRI NIRSpec
1220	NIRSpec IFS of BR1202	Pierre Ferruit	NIRSpec
1222	Cosmic Re-ionization, Metal Enrichment, and Host Galaxies from Quasar Spectroscopy	Chris Willott	NIRSpec
1243	Exploring the End of Cosmic Reionization	Simon Lilly	NIRCam
1264	NIRSpec and MIRI IFS of SMGs	Luis Colina Robledo	MIRI NIRSpec

Protostars, Protostellar Disks, and Young Stellar Objects

ID	Program Title	Principal Investigator	Instrument
1179	YSO Imaging	Jarron Leisenring	NIRCam
1186	Protostar (YSO) Spectroscopy	Thomas Greene	NIRSpec
1187	Extinction Mapping of Pre-stellar Cores	Klaus Hodapp	NIRCam
1235	LMC-N79: Study of Most Massive Young Stellar Object Star Forming Region	Margaret Meixner	MIRI NIRCam
1236	Protostellar Binaries in Perseus	Michael Ressler	MIRI
1257	The Young Protostellar Outflow HH211as	Thomas Ray	MIRI NIRCam NIRSpec
1258	Structure, Excitation, and Proper Motions in the Symmetric HH212 Jet	Mark McCaughrean	NIRCam
1282	MIRI EC Protoplanetary and Debris Disks Survey	Thomas Henning	MIRI NIRSpec
1290	MIRI EC Protostars Survey	Ewine Van Dishoeck	MIRI NIRSpec
1293	Collimation Zone in Protostellar Jets, the Final Frontier. MIRI MRS and Imager Simultaneous Observations	Alberto Noriega-Crespo	MIRI

Solar System

ID	Program Title	Principal Investigator	Instrument
1191	Kuiper Belt Science with JWST	John Stansberry	MIRI NIRSpec
1231	Surface Composition of Mid-sized TNOs: Searching for Ammonia	Aurelie Guilbert-Lepoutre	NIRSpec
1244	Large Asteroids and Trojan Asteroids	Andrew Rivkin	MIRI NIRCam NIRSpec
1245	Near-Earth Objects	Cristina Thomas	MIRI NIRCam NIRSpec
1246	Jupiter's Great Red Spot	Leigh Fletcher	MIRI
1247	Saturn	Leigh Fletcher	MIRI NIRCam NIRSpec
1248	Uranus	Leigh Fletcher	MIRI NIRSpec
1249	Neptune	Leigh Fletcher	MIRI
1250	Probing the Sub-surface Oceans of Europa and Enceladus with JWST	Geronimo Villanueva	MIRI NIRCam NIRSpec
1251	Titan Climate, Composition and Clouds	Conor Nixon	MIRI NIRCam NIRSpec
1252	Spectral Mapping of a Comet's Inner Coma	Michael Kelley	MIRI NIRCam NIRSpec
1253	ToO Comet	Stefanie Milam	NIRSpec
1254	TNOs	Alex Parker	MIRI NIRSpec
1255	JWST Medium-Deep Fields -- Hammel IDS GTO Program	Stefanie Milam	NIRCam
1271	ToO TNOs: 'Unveiling the Kuiper Belt by Stellar Occultations'	Pablo Santos-Sanz	NIRCam
1272	Kuiper Belt Science with JWST	Dean Hines	MIRI NIRSpec
1273	Kuiper Belt Science with JWST	Jonathan Lunine	MIRI NIRSpec
1415	Mars	Geronimo Villanueva	NIRCam NIRSpec

Star Clusters, Star Formation Regions, Planetary Nebulae, and Galactic Transients

ID	Program Title	Principal Investigator	Instrument
1182	NIRCam GTO - IRDC Mapping	Erick Young	NIRCam
1190	Embedded Cluster Survey	Michael Meyer	NIRCam
1232	SN 1987A: The Formation and Evolution of Dust in a Supernova Explosion	Gillian Wright	MIRI NIRSpec
1237	Star Formation in the Extreme Outer Galaxy	Michael Ressler	MIRI
1238	Sparse Spectral Mapping of NGC 1514	Michael Ressler	MIRI
1239	Investigating Dusty Disks in Evolved Stars	Michael Ressler	MIRI
1240	De-mystifying SPRITES with JWST	Michael Ressler	MIRI NIRSpec
1242	Planets in Formation and Exozodiacal Disks	Doug Johnstone	NIRISS
1306	Galactic Center Astrometry	Roeland van der Marel	NIRCam

Targeted Galaxies

ID	Program Title	Principal Investigator	Instrument
1176	JWST Medium-Deep Fields -- Windhorst IDS GTO Program	Rogier Windhorst	NIRCam NIRSpec
1178	Ram Pressure Stripping in ESO 137-001	Scott Friedman	MIRI
1204	Are There AGN Embedded in All Ultraluminous Infrared Galaxies (ULIRGs)?	George Rieke	MIRI
1223	NIRSpec GTO observations of NGC 4654	Torsten Boeker	NIRSpec
1225	Star Formation in the Local Grouroup - NGC 3603	Guido De Marchi	NIRSpec
1226	Star Formation in the Local Group - NGC 2070 (30 Dor)	Guido De Marchi	NIRSpec
1227	NGC 346: Star Formation at Low Metallicity in the Small Magellanic Cloud	Margaret Meixner	MIRI NIRCam NIRSpec
1233	I Zw 18: Dust Life Cycle at Very Low Metallicity	Margaret Meixner	MIRI NIRCam
1234	NGC 6822: Dust Life Cycle Study of a Nearby Low Metallicity Galaxy	Margaret Meixner	MIRI NIRCam
1260	NGC 1068 as Proving Ground for NIRISS AMI	K. E. Saavik Ford	NIRISS
1265	NGC 6240	Almudena Alonso-Herrero	MIRI NIRSpec
1266	NIRSpec & MIRI Integral-Field Spectroscopy of the Galactic Center	Macarena Garcia Marin	MIRI NIRSpec
1267	NIRSpec+MIRI IFU Observations of Arp220	Daniel Dicken	MIRI NIRSpec
1268	NIRSpec & MIRI Integral-Field Spectroscopy of the Nucleus of Mrk 231	Roberto Maiolino	MIRI NIRSpec
1269	NIRSpec Observations of Centaurus-A: A GTO Program Proposal	Nora Luetzgendorf	MIRI NIRSpec
1304	Internal Dynamics of Milky Way Dwarf Spheroidal Galaxies	Roeland van der Marel	NIRCam
1305	Dynamics of the Andromeda Galaxy Satellite System	Roeland van der Marel	NIRCam