17914( 5) - 26-Nov-2025 19:53:45 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17914 Version: 5 Check-in Time: 26-Nov-2025 19:53:45 STScI Edit Number: 2 Title The UV-Optical-IR Spectral Energy Distribution of Quasi-Periodic Eruptions ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Kishore C. Patra University of California - Santa Cruz Y CoI: Prof. Ryan Foley University of California - Santa Cruz N CoI: Dr. Wenbin Lu University of California - Berkeley N CoI: Prof. Alex V. Filippenko University of California - Berkeley N CoI: Riccardo Arcodia Massachusetts Institute of Technology N CoI: Dr. K. Decker French University of Illinois at Urbana - N Champaign CoI: Mr. Nils Hoyer Max Planck Institute for Astronomy N CoI: Prof. Stefano Bianchi Universita di Roma Tre N CoI: Margherita Giustini Centro de Astrobiologia - CAB N CoI: Dr. Thomas Wevers Space Telescope Science Institute N CoI: Dr. Giovanni Miniutti Centro de Astrobiologia - CAB N ------------------------------------------------------------------------------------ Abstract Quasi-Periodic Eruptions (QPEs) are a new class of soft X-ray sources that exhibit high-amplitude flares with recurrence times ranging from a few hours to days. They are associated with low-mass massive black holes (MBHs) at galactic centers, but their nature and origin remain mysterious and strongly debated. Many theoretical frameworks invoke a compact accretion disk around the MBH to explain the origins of QPEs. We propose to obtain high-resolution images of 3 QPE host galaxies to create a comprehensive UV-optical-IR spectral energy distribution (SED) of their nuclear regions on the scale of 0.1 arcsec. Our scientific goals for constructing the SED are to test the compactness of the accretion disk, and study the nuclear star clusters (NSCs) in these QPE sources. These observations have the potential for redefining the burgeoning QPE field by testing the various models for the origins of QPEs and the broader context of MBH accretion disks and their evolution. Beyond our immediate science goals, the broad-band images of QPE hosts proposed here will have long-term value in studying their star-formation history, central stellar concentration, and morphology, providing a comprehensive understanding of the environments that facilitate QPE occurrences. Only HST can provide sufficiently high-resolution imaging across a wide range of wavelengths to resolve out the majority of the stellar light in the QPE hosts. QPEs are quickly becoming an exciting probe of low-mass SMBHs, making this proposal timely in the pursuit of understanding these puzzling phenomena. ------------------------------------------------------------------------------------ Observations Description ------------------------ The observations involve multiband imaging of three galactic nuclei that host quasi-periodic X-ray sources, using ACS/SBC, WFC3/UVIS, and WFC3/IR. The three targets are: GSN 069, RX J1301, and ERO-QPE2. 17914( 5) - 26-Nov-2025 19:53:45 - [ 2] Each target will be imaged in the following filters: ACS/SBC: F125LP, F150LP WFC3/UVIS: F225W, F336W, F438W, F625W, F775W WFC3/IR: F105W, F160W Each target will have 2 visits (one for ACS/SBC and the other for WFC3/UVIS and IR). Both visits for a given target are grouped with the requirement to be observed quasi-simultaneously within 2 days of each other. ------------------------------------------------------------------------------------ 17914( 5) - 26-Nov-2025 19:53:45 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GSN069 GALAXY, ACCRETION DISK, RA=01H19M8.6600S, J2000 Z = V = 17.5 Estimated FUV 20 mag NUCLEUS DEC=-34D11'30.52" 0.018 Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ1301.9+27 GALAXY, ACCRETION DISK, RA=13H02M0.1400S, J2000 Z = V = 17 Estimated FUV 20 mag 47 NUCLEUS DEC=+27D46'57.90" 0.0237 Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 ERO-QPE2 GALAXY, ACCRETION DISK, RA=02H34M48.7050S, J2000 V = 18 Estimated FUV 22 mag NUCLEUS DEC=-44D19'32.79" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17914( 5) - 26-Nov-2025 19:53:45 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-SBC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.472 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 44.4 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17914( 5) - 26-Nov-2025 19:53:45 - [ 5] Visit: 01 (Visit: GSN069 ACS/SBC) Visit Requirements: GROUP 01, 1A WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 1 orbit with the following observations Orbit 1: ACS/SBC F125LP & F150LP 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 GSN069 ACS/SBC ACCUM SBC F125LP 1 587 S PATTERN 1 1-2 (1174 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GSN069 ACS/SBC ACCUM SBC F150LP 1 587 S (1174 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 | ------------------------------------------------------------------------------------------------------------------------------------ GSN069 1 ACS/SBC ACCUM SBC F125LP 1 none none none 1 N/A GSN069 1 ACS/SBC ACCUM SBC F125LP 2 none none none 1 N/A GSN069 2 ACS/SBC ACCUM SBC F150LP 1 none none none 1 N/A GSN069 2 ACS/SBC ACCUM SBC F150LP 2 none none none 1 N/A 17914( 5) - 26-Nov-2025 19:53:45 - [ 6] Visit: 02 (Visit: RX J1301 ACS/SBC) Visit Requirements: GROUP 02, 2A WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 1 orbit with the following observations Orbit 1: ACS/SBC F125LP & F150LP 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 RXJ1301.9+2 ACS/SBC ACCUM SBC F125LP 1 587 S PATTERN 1 1-2 747 (1174 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ1301.9+2 ACS/SBC ACCUM SBC F150LP 1 587 S 747 (1174 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ1301.9+2747 1 ACS/SBC ACCUM SBC F125LP 1 none none none 1 N/A RXJ1301.9+2747 1 ACS/SBC ACCUM SBC F125LP 2 none none none 1 N/A RXJ1301.9+2747 2 ACS/SBC ACCUM SBC F150LP 1 none none none 1 N/A RXJ1301.9+2747 2 ACS/SBC ACCUM SBC F150LP 2 none none none 1 N/A 17914( 5) - 26-Nov-2025 19:53:45 - [ 7] Visit: 03 (Visit: ERO-QPE2 ACS/SBC) Visit Requirements: GROUP 03, 3A WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 2 orbits with the following division Orbit 1: ACS/SBC F125LP Orbit 2: ACS/SBC F150LP 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 ERO-QPE2 ACS/SBC ACCUM SBC F125LP 1 1254 S PATTERN 1 1 (2508 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ERO-QPE2 ACS/SBC ACCUM SBC F150LP 1 1254 S PATTERN 1 2 (2508 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 | ------------------------------------------------------------------------------------------------------------------------------------ ERO-QPE2 1 ACS/SBC ACCUM SBC F125LP 1 none none none 1 N/A ERO-QPE2 1 ACS/SBC ACCUM SBC F125LP 2 none none none 1 N/A ERO-QPE2 2 ACS/SBC ACCUM SBC F150LP 1 none none none 2 N/A ERO-QPE2 2 ACS/SBC ACCUM SBC F150LP 2 none none none 2 N/A 17914( 5) - 26-Nov-2025 19:53:45 - [ 8] Visit: 1A (Visit: GSN069 WFC3) Visit Requirements: GROUP 1A, 01 WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 2 orbits with the following division Orbit 1: WFC3/UVIS F225W & F336W & F438W Orbit 2: WFC3/UVIS F625W & F775W --> switch to WFC3/IR F105W & F160W 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 GSN069 WFC3/UVI ACCUM UVIS2-C1K F225W FLASH=20 1 500 S PATTERN 2 1 S 1C-CTE (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GSN069 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=20 1 200 S (400 PATTERN 2 2-3 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 GSN069 WFC3/UVI ACCUM UVIS2-2K2 F438W FLASH=20 1 150 S (300 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GSN069 WFC3/UVI ACCUM UVIS2-2K2 F625W FLASH=20 1 60 S (120 PATTERN 2 4-5 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GSN069 WFC3/UVI ACCUM UVIS2-2K2 F775W FLASH=20 1 60 S (120 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 GSN069 WFC3/IR MULTIAC IRSUB512 F105W NSAMP=15, SAMP-SEQ=STEP25 1 DEF PATTERN 3 6-7 CUM (486.092 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 GSN069 WFC3/IR MULTIAC IRSUB512 F160W NSAMP=15, SAMP-SEQ=STEP25 1 DEF CUM (486.092 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 | ------------------------------------------------------------------------------------------------------------------------------------ GSN069 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-CTE GSN069 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-CTE GSN069 2 WFC3/UVI ACCUM UVIS2-2K F336W 1 none none none 1 N/A S 2C-SUB GSN069 2 WFC3/UVI ACCUM UVIS2-2K F336W 2 none none none 1 N/A S 2C-SUB GSN069 3 WFC3/UVI ACCUM UVIS2-2K F438W 1 none none none 1 N/A S 2C-SUB 17914( 5) - 26-Nov-2025 19:53:45 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ GSN069 3 WFC3/UVI ACCUM UVIS2-2K F438W 2 none none none 1 N/A S 2C-SUB GSN069 4 WFC3/UVI ACCUM UVIS2-2K F625W 1 none none none 2 N/A S 2C-SUB GSN069 4 WFC3/UVI ACCUM UVIS2-2K F625W 2 none none none 2 N/A S 2C-SUB GSN069 5 WFC3/UVI ACCUM UVIS2-2K F775W 1 none none none 2 N/A S 2C-SUB GSN069 5 WFC3/UVI ACCUM UVIS2-2K F775W 2 none none none 2 N/A S 2C-SUB GSN069 6 WFC3/IR MULTIAC IRSUB512 F105W 1 none none none 2 N/A CUM GSN069 6 WFC3/IR MULTIAC IRSUB512 F105W 2 none none none 2 N/A CUM GSN069 7 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 2 N/A CUM GSN069 7 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 2 N/A CUM 17914( 5) - 26-Nov-2025 19:53:45 - [ 10] Visit: 2A (Visit: RX J1301 WFC3) Visit Requirements: GROUP 2A, 02 WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 2 orbits with the following division Orbit 1: WFC3/UVIS F225W & F336W & F438W Orbit 2: WFC3/UVIS F625W & F775W --> switch to WFC3/IR F105W & F160W 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 RXJ1301.9+2 WFC3/UVI ACCUM UVIS2-C1K F225W FLASH=20 1 500 S PATTERN 2 1 747 S 1C-CTE (1000 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 RXJ1301.9+2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=20 1 200 S (400 PATTERN 2 2-3 747 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 RXJ1301.9+2 WFC3/UVI ACCUM UVIS2-2K2 F438W FLASH=20 1 150 S (300 747 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 RXJ1301.9+2 WFC3/UVI ACCUM UVIS2-2K2 F625W FLASH=20 1 60 S (120 PATTERN 2 4-5 747 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 RXJ1301.9+2 WFC3/UVI ACCUM UVIS2-2K2 F775W FLASH=20 1 60 S (120 747 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 RXJ1301.9+2 WFC3/IR MULTIAC IRSUB512 F105W NSAMP=15, SAMP-SEQ=STEP25 1 DEF PATTERN 3 6-7 747 CUM (486.092 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 RXJ1301.9+2 WFC3/IR MULTIAC IRSUB512 F160W NSAMP=15, SAMP-SEQ=STEP25 1 DEF 747 CUM (486.092 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ1301.9+2747 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-CTE RXJ1301.9+2747 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-CTE RXJ1301.9+2747 2 WFC3/UVI ACCUM UVIS2-2K F336W 1 none none none 1 N/A S 2C-SUB RXJ1301.9+2747 2 WFC3/UVI ACCUM UVIS2-2K F336W 2 none none none 1 N/A S 2C-SUB RXJ1301.9+2747 3 WFC3/UVI ACCUM UVIS2-2K F438W 1 none none none 1 N/A S 2C-SUB 17914( 5) - 26-Nov-2025 19:53:45 - [ 11] 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 | ------------------------------------------------------------------------------------------------------------------------------------ RXJ1301.9+2747 3 WFC3/UVI ACCUM UVIS2-2K F438W 2 none none none 1 N/A S 2C-SUB RXJ1301.9+2747 4 WFC3/UVI ACCUM UVIS2-2K F625W 1 none none none 2 N/A S 2C-SUB RXJ1301.9+2747 4 WFC3/UVI ACCUM UVIS2-2K F625W 2 none none none 2 N/A S 2C-SUB RXJ1301.9+2747 5 WFC3/UVI ACCUM UVIS2-2K F775W 1 none none none 2 N/A S 2C-SUB RXJ1301.9+2747 5 WFC3/UVI ACCUM UVIS2-2K F775W 2 none none none 2 N/A S 2C-SUB RXJ1301.9+2747 6 WFC3/IR MULTIAC IRSUB512 F105W 1 none none none 2 N/A CUM RXJ1301.9+2747 6 WFC3/IR MULTIAC IRSUB512 F105W 2 none none none 2 N/A CUM RXJ1301.9+2747 7 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 2 N/A CUM RXJ1301.9+2747 7 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 2 N/A CUM 17914( 5) - 26-Nov-2025 19:53:45 - [ 12] Visit: 3A (Visit: ERO-QPE2 WFC3) Visit Requirements: GROUP 3A, 03 WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 2 orbits with the following division Orbit 1: WFC3/UVIS F225W & F336W & F438W Orbit 2: WFC3/UVIS F625W & F775W --> switch to WFC3/IR F105W & F160W 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 ERO-QPE2 WFC3/UVI ACCUM UVIS2-C1K F225W FLASH=20 1 575 S PATTERN 2 1 S 1C-CTE (1150 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=20 1 180 S (360 PATTERN 2 2-3 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F438W FLASH=20 1 100 S (200 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F625W FLASH=20 1 60 S (120 PATTERN 2 4-5 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F775W FLASH=20 1 60 S (120 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ERO-QPE2 WFC3/IR MULTIAC IRSUB512 F105W NSAMP=15, SAMP-SEQ=STEP25 1 DEF PATTERN 3 6-7 CUM (486.092 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ERO-QPE2 WFC3/IR MULTIAC IRSUB512 F160W NSAMP=15, SAMP-SEQ=STEP25 1 DEF CUM (486.092 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 | ------------------------------------------------------------------------------------------------------------------------------------ ERO-QPE2 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-CTE ERO-QPE2 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-CTE ERO-QPE2 2 WFC3/UVI ACCUM UVIS2-2K F336W 1 none none none 1 N/A S 2C-SUB ERO-QPE2 2 WFC3/UVI ACCUM UVIS2-2K F336W 2 none none none 1 N/A S 2C-SUB ERO-QPE2 3 WFC3/UVI ACCUM UVIS2-2K F438W 1 none none none 1 N/A S 2C-SUB 17914( 5) - 26-Nov-2025 19:53:45 - [ 13] 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 | ------------------------------------------------------------------------------------------------------------------------------------ ERO-QPE2 3 WFC3/UVI ACCUM UVIS2-2K F438W 2 none none none 1 N/A S 2C-SUB ERO-QPE2 4 WFC3/UVI ACCUM UVIS2-2K F625W 1 none none none 2 N/A S 2C-SUB ERO-QPE2 4 WFC3/UVI ACCUM UVIS2-2K F625W 2 none none none 2 N/A S 2C-SUB ERO-QPE2 5 WFC3/UVI ACCUM UVIS2-2K F775W 1 none none none 2 N/A S 2C-SUB ERO-QPE2 5 WFC3/UVI ACCUM UVIS2-2K F775W 2 none none none 2 N/A S 2C-SUB ERO-QPE2 6 WFC3/IR MULTIAC IRSUB512 F105W 1 none none none 2 N/A CUM ERO-QPE2 6 WFC3/IR MULTIAC IRSUB512 F105W 2 none none none 2 N/A CUM ERO-QPE2 7 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 2 N/A CUM ERO-QPE2 7 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 2 N/A CUM 17914( 5) - 26-Nov-2025 19:53:45 - [ 14] Visit: 3B (Visit: ERO-QPE2 ACS/SBC) Visit Requirements: GROUP 3B, 3C WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 2 orbits with the following division Orbit 1: ACS/SBC F125LP Orbit 2: ACS/SBC F150LP 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 ERO-QPE2 ACS/SBC ACCUM SBC F125LP 1 1254 S PATTERN 1 1 (2508 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ERO-QPE2 ACS/SBC ACCUM SBC F150LP 1 1254 S PATTERN 1 2 (2508 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 | ------------------------------------------------------------------------------------------------------------------------------------ ERO-QPE2 1 ACS/SBC ACCUM SBC F125LP 1 none none none 1 N/A ERO-QPE2 1 ACS/SBC ACCUM SBC F125LP 2 none none none 1 N/A ERO-QPE2 2 ACS/SBC ACCUM SBC F150LP 1 none none none 2 N/A ERO-QPE2 2 ACS/SBC ACCUM SBC F150LP 2 none none none 2 N/A 17914( 5) - 26-Nov-2025 19:53:45 - [ 15] Visit: 3C (Visit: ERO-QPE2 WFC3) Visit Requirements: GROUP 3C, 3B WITHIN 2D On Hold Comments: Additional Comments: This visit consists of 2 orbits with the following division Orbit 1: WFC3/UVIS F225W & F336W & F438W Orbit 2: WFC3/UVIS F625W & F775W --> switch to WFC3/IR F105W & F160W 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 ERO-QPE2 WFC3/UVI ACCUM UVIS2-C1K F225W FLASH=20 1 575 S PATTERN 2 1 S 1C-CTE (1150 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F336W FLASH=20 1 180 S (360 PATTERN 2 2-3 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F438W FLASH=20 1 100 S (200 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 4 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F625W FLASH=20 1 60 S (120 PATTERN 2 4-5 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 5 ERO-QPE2 WFC3/UVI ACCUM UVIS2-2K2 F775W FLASH=20 1 60 S (120 S C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 6 ERO-QPE2 WFC3/IR MULTIAC IRSUB512 F105W NSAMP=15, SAMP-SEQ=STEP25 1 DEF PATTERN 3 6-7 CUM (486.092 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 ERO-QPE2 WFC3/IR MULTIAC IRSUB512 F160W NSAMP=15, SAMP-SEQ=STEP25 1 DEF CUM (486.092 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 | ------------------------------------------------------------------------------------------------------------------------------------ ERO-QPE2 1 WFC3/UVI ACCUM UVIS2-C1 F225W 1 none none none 1 N/A S K1C-CTE ERO-QPE2 1 WFC3/UVI ACCUM UVIS2-C1 F225W 2 none none none 1 N/A S K1C-CTE ERO-QPE2 2 WFC3/UVI ACCUM UVIS2-2K F336W 1 none none none 1 N/A S 2C-SUB ERO-QPE2 2 WFC3/UVI ACCUM UVIS2-2K F336W 2 none none none 1 N/A S 2C-SUB ERO-QPE2 3 WFC3/UVI ACCUM UVIS2-2K F438W 1 none none none 1 N/A S 2C-SUB 17914( 5) - 26-Nov-2025 19:53:45 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ ERO-QPE2 3 WFC3/UVI ACCUM UVIS2-2K F438W 2 none none none 1 N/A S 2C-SUB ERO-QPE2 4 WFC3/UVI ACCUM UVIS2-2K F625W 1 none none none 2 N/A S 2C-SUB ERO-QPE2 4 WFC3/UVI ACCUM UVIS2-2K F625W 2 none none none 2 N/A S 2C-SUB ERO-QPE2 5 WFC3/UVI ACCUM UVIS2-2K F775W 1 none none none 2 N/A S 2C-SUB ERO-QPE2 5 WFC3/UVI ACCUM UVIS2-2K F775W 2 none none none 2 N/A S 2C-SUB ERO-QPE2 6 WFC3/IR MULTIAC IRSUB512 F105W 1 none none none 2 N/A CUM ERO-QPE2 6 WFC3/IR MULTIAC IRSUB512 F105W 2 none none none 2 N/A CUM ERO-QPE2 7 WFC3/IR MULTIAC IRSUB512 F160W 1 none none none 2 N/A CUM ERO-QPE2 7 WFC3/IR MULTIAC IRSUB512 F160W 2 none none none 2 N/A CUM 17914( 5) - 26-Nov-2025 19:53:45 - [ 17] Summary Form for Proposal 17914 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IRSUB512, SBC, UVIS2-2K2C-SUB, UVIS2-C1K1C-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=20, NSAMP=15, SAMP-SEQ=STEP25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 01, 1A WITHIN 2D, GROUP 02, 2A WITHIN 2D, GROUP 03, 3A WITHIN 2D, GROUP 1A, 01 WITHIN 2D, GROUP 2A, 02 WITHIN 2D, GROUP 3A, 03 WITHIN 2D, GROUP 3B, 3C WITHIN 2D, GROUP 3C, 3B WITHIN 2D, PATTERN 1 1, PATTERN 1 1-2, PATTERN 1 2, PATTERN 2 1, PATTERN 2 2-3, PATTERN 2 4-5, PATTERN 3 6-7 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F125LP, F150LP, F160W, F225W, F336W, F438W, F625W, F775W ------------------------------------------------------------------------------------------------------------------------------------ Target Names ERO-QPE2, GSN069, RXJ1301.9+2747 ------------------------------------------------------------------------------------------------------------------------------------