Director's Discretionary Time Observations

Director’s Discretionary Time (DDT) can be requested for time-critical observations that cannot plausibly be scheduled for the regular proposal cycle. These types of proposals might be appropriate for the follow-up of newly-discovered unexpected transient phenomena or when developments since the last proposal cycle make a time-critical observation necessary. They are also appropriate for timely follow-up of new discoveries that will provide a critical link in the understanding of the phenomena.

To view details about a specific program, click the Program ID. 

PID Title PI Instruments Allocated Hours Cycle
6549 Lensed Supernova Encore at z=2! The First Galaxy to Host Two Multiply-Imaged Supernovae Justin Pierel NIRCam 7.3 2
6543 Stellar Activity Characterization of LHS 1140 - Is LHS 1140 b a Mini-Neptune or a Water World? Charles Cadieux NIRISS 15.8 2
6541 JWST NIRSpec/NIRCam Follow-Up of the High-Redshift Transients Discovered in the GOODS-S JADES-Deep Field Eiichi Egami NIRCam
18.3 2
4621 Time-sensitive observations of Chiron: a unique active Centaur beyond 15 AU Ian Wong NIRSpec 4.0 2
4558 Establishing the Formation of AF Lep b with NIRCam: The Lowest-Mass Imaged Exoplanet with a Dynamical Mass Kyle Franson NIRCam 6.4 2
4557 JWST/NIRSpec confirmation of z~3 transients found by JWST/NIRCam Haojing Yan NIRSpec 10.8 2
4554 Revealing the progenitor of the dirty fireball gamma-ray burst AT 2023lcr through its supernova component Antonio Martin-Carrillo NIRCam
4.7 2
4520 Near- and Mid-IR Observations to Probe Dust Formation in the Remarkably Nearby Stripped-Envelope Supernova 2023dbc Melissa Shahbandeh MIRI
4.4 2
4522 Dust Our Luck – Measuring Molecule and Dust Formation in M101’s Hydrogen-rich SN 2023ixf Chris Ashall MIRI
2.4 1
4446 SN H0pe: Independent Measurement of H0 by the Time Delay of a Multiply-imaged Supernova Brenda Frye NIRCam
10.5 1
4445 Revealing the nature of the exceptional GRB 230307A: nearby nucleosynthesis or a primordial explosion? Andrew Levan NIRCam
4.7 1
4436 Near- and Mid-IR Observations to Probe Dust Formation in the Remarkably Nearby Stripped-Envelope Supernova 2023dbc Melissa Shahbandeh MIRI
1.8 1


The late time spectrum of a kilonova in the exceptionally bright GRB 230307A Andrew Levan NIRCam
4.9 1


The impact of smaller accretion bursts on the planet-forming material in the disk of a young eruptive star Peter Abraham MIRI 2.2 1
4426 An unprecedented spatially resolved analysis of the brightest galaxy at z>10 in GOODS-N Roberto Maiolino NIRSpec 17.7 1
2787 A sensitive search for rings and small moons in the Martian system using JWST Geronimo Villanueva NIRCam 5.7 1
2784 Late Time Observations of GRB 221009A: The First Search for r-Process Nucleosynthesis in a Collapsar Peter Blanchard NIRCam
11.2 1
2783 MIRI LRS follow up on SO2 detection in WASP-39b Diana Powell MIRI 10.7 1

Heavy element formation in the brightest gamma-ray burst of all time

Andrew Levan



2.2 1
2767 Imaging and Spectroscopy of Three Highly Magnified Images of a Supernova at z=1.5 Patrick Kelly NIRCam
10.3 1
2756 Imaging and Spectroscopic Follow-up of a Supernova at Redshift z=3.47 Wenlei Chen NIRCam


2754 Unique Constraints on Early Dust Growth in Core-Collapse Supernovae Justin Pierel MIRI 5.6 1

Spectroscopic follow-up of ultra-high-z candidates in CEERS: Characterizing true z > 12 galaxies and z~4-7 interlopers in preparation for JWST Cycle 2

Pablo Arrabal Haro NIRSpec 8.0 1


The Volatile Content of Oort Cloud Comet C/2014 UN271 Bryce Bolin NIRSpec




JWST Cycle 1 Outreach Campaign

Klaus Pontoppidan







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