18069( 4) - 01-Dec-2025 15:36:48 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18069 Version: 4 Check-in Time: 01-Dec-2025 15:36:48 STScI Edit Number: 1 Title Requiem's Return: Precision cosmology from a decade-delayed, strongly-lensed supernova and its new sibling ------------------------------------------------------------------------------------ Type Cycle GO 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Justin Pierel Space Telescope Science Institute Y CoI: Prof. Sherry H. Suyu Technical University of Munich N CoI: Conor Larison Space Telescope Science Institute N CoI: Dr. Jose M. Diego Instituto de Fisica de Cantabria N CoI: Dr. Anton M. Koekemoer Space Telescope Science Institute Y CoI: Dr. Stefan Schuldt Universita di Milano N CoI: Dr. Andrew B. Newman Carnegie Institution of Washington N CoI: Prof. Masamune Oguri Chiba University N CoI: Prof. Adi Zitrin Ben-Gurion University of the Negev N CoI: Dr. Patrick S. Kamieneski Chalmers University of Technology N CoI: Dr. Martin Millon ETH Zurich N CoI: Ana Acebron Instituto de Fisica de Cantabria N CoI: Dr. Piero Rosati Universita degli studi di Ferrara N CoI: Dr. Pietro Bergamini Universita di Milano N CoI: Dr. Stefan Taubenberger Max Planck Institute for Astrophysics N CoI: Sebastian Ertl Max Planck Institute for Astrophysics N CoI: Dr. Suhail Dhawan University of Cambridge N CoI: Dr. Louis-Gregory Strolger Space Telescope Science Institute N CoI: Dr. Wenlei Chen Oklahoma State University Main Campus N CoI: Dr. Leonidas A Moustakas Jet Propulsion Laboratory N CoI: Elias Mamuzic Max Planck Institute for Astrophysics N CoI: Dr. Massimo Pascale University of California - Los Angeles N CoI: Prof. Myungkook J. Jee Yonsei University N CoI: Mr. Sangjun Cha Yonsei University N CoI: Dr. Anowar J Shajib University of Chicago N CoI: Dr. Raoul Canameras CNRS, Laboratoire d'Astrophysique de N Marseille CoI: Prof. Claudio Grillo Universita di Milano N CoI: Dr. Ismael Perez-Fournon Instituto de Astrofisica de Canarias N CoI: Dr. Saurabh W. Jha Rutgers the State University of New Jersey N CoI: Prof. Xiaosheng Huang University of San Francisco N CoI: Giovanni Granata Portsmouth University/ICG N CoI: Prof. Brenda Louise Frye University of Arizona N CoI: Aadya Agrawal University of Illinois at Urbana - N Champaign ------------------------------------------------------------------------------------ Abstract This program will capture the reappearance of a strongly lensed Type Ia supernova (SN Ia), SN Requiem, a decade after its initial discovery. Lensed by the galaxy cluster MACS J0138-2155, the first three images of SN Requiem at z=1.95 were seen in a 2016 HST visit; the fourth is predicted to appear a decade later. In 2023, this system became even more remarkable with JWST's discovery of a second lensed SN Ia in 18069( 4) - 01-Dec-2025 15:36:48 - [ 2] the same host galaxy, named SN Encore. Detecting SN Requiem's fourth image enables the first joint Hubble constant (H0) measurement from two lensed SNe in one system. Using archival JWST, HST, and MUSE data, we built seven lens mass models of the cluster, incorporating both statistical and systematic uncertainties, to predict SN Requiem's reappearance. If H0 = 73 km/s/Mpc, the fourth image is expected in June-Nov 2026; if H0 = 67.4 km/s/Mpc, then Apr-Sept 2027. We propose two HST cycles to monitor the cluster and catch the reappearance, triggering JWST ToO imaging and spectroscopy upon detection to measure the longest-ever lensing time delay (~10 years). This allows a Requiem+Encore H0 measurement with <3% uncertainty -- the most precise from lensed SNe to date -- and directly addresses the Hubble tension between early- and late-Universe values. Our program leverages HST WFC3/IR as the most efficient tool to monitor the system and detect SN Requiem, and JWST to capture the full UV-NIR photometric and spectroscopic evolution of this rare event. ------------------------------------------------------------------------------------ Observations Description ------------------------ We have used the existing HST detections of SN Requiem, in conjunction with our mass models and microlensing simulations, to predict the SN-R4 reappearance brightness range in HST F110W/F160W filters. These filters are the optimal choice as they are the most efficient means of sampling the rest-frame UV+optical SED of a z = 2 SN with HST, providing roughly rest-frame u + B and V band, respectively. These filters were used to detect SN Requiem in 2016, enabling immediate difference imaging at SN-R4 and a direct comparison to SN-R1, 2, 3. We choose 3sigma limiting magnitudes for both filters that enable a 2-filter detection for ~90% of the detection range. Reaching these depths requires 2 orbits (1.5 F160W, 0.5 F110W) per visit. If the SN is only detected in F160W, we will require detections in all (6) exposures across both orbits. We will monitor with ~monthly cadence during the HST visibility windows, corresponding to a ~10 rest-frame day cadence. This is designed such that during the monitoring windows we guarantee a pre-peak detection and near-peak JWST follow-up, as the rise time for SNe Ia is generally 15-20 rest-frame days. We require 7 visits in Cycle 33 and 6 in Cycle 34 considering a ~5 month gap when SN Requiem is behind the sun. The total HST request is therefore 2x7 + 2x6 = 26 orbits. Only one observing gap is filled with a JWST visit. ------------------------------------------------------------------------------------ 18069( 4) - 01-Dec-2025 15:36:48 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 EXT-STAR, SUPERNOVA RA=01H38M2.1602S +/- 0.1", J2000 V = 26 +/- 1 TYPE IA DEC=-21D55'22.41" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 18069( 4) - 01-Dec-2025 15:36:48 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 18069( 4) - 01-Dec-2025 15:36:48 - [ 5] Visit: 01 Visit Requirements: BETWEEN 07-NOV-2025:00:00:00 AND 11-NOV-2025:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 6] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 7] Visit: 02 Visit Requirements: BETWEEN 20-DEC-2025:00:00:00 AND 24-DEC-2025:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 8] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 9] Visit: 03 Visit Requirements: BETWEEN 03-JUN-2026:00:00:00 AND 07-JUN-2026:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 10] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 11] Visit: 04 Visit Requirements: AFTER 03 BY 27 D TO 33 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 12] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 13] Visit: 05 Visit Requirements: AFTER 04 BY 27 D TO 33 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 14] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 15] Visit: 06 Visit Requirements: BETWEEN 27-AUG-2026:00:00:00 AND 03-SEP-2026:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 16] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 17] Visit: 07 Visit Requirements: BETWEEN 27-SEP-2026:00:00:00 AND 01-OCT-2026:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-R4 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-R4 WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 7 CUM (2408.805 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 18] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-R4 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM SN-R4 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-R4 7 WFC3/IR MULTIAC IR F160W 3 none none none 2 N/A CUM 18069( 4) - 01-Dec-2025 15:36:48 - [ 19] Summary Form for Proposal 18069 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, NSAMP=13, NSAMP=9, SAMP-SEQ=SPARS100, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 03 BY 27 D TO 33 D, AFTER 04 BY 27 D TO 33 D, BETWEEN 03-JUN-2026:00:00:00 AND 07-JUN-2026:00:00:00, BETWEEN 07-NOV-2025:00:00:00 AND 11-NOV-2025:00:00:00, BETWEEN 20-DEC-2025:00:00:00 AND 24-DEC-2025:00:00:00, BETWEEN 27-AUG-2026:00:00:00 AND 03-SEP-2026:00:00:00, BETWEEN 27-SEP-2026:00:00:00 AND 01-OCT-2026:00:00:00, PATTERN 1 7, POS TARG .474, .424, POS TARG .925, .827, POS TARG 0, 0, POS TARG 0.451, 0.403, POS TARG 0.902, 0.806, POS TARG 1.376, 1.230, SEQ 1-6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-R4 ------------------------------------------------------------------------------------------------------------------------------------