17831( 9) - 27-Mar-2026 13:02:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17831 Version: 9 Check-in Time: 27-Mar-2026 13:02:33 STScI Edit Number: 7 Title Ionization Echoes of Fading AGN ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Moire Prescott New Mexico State University Y CoI: Dr. William Clifford Keel University of Alabama N CoI: Kelly Sanderson New Mexico State University N CoI: Audrey Frances Dijeau New Mexico State University N ------------------------------------------------------------------------------------ Abstract Understanding how and why Active Galactic Nuclei (AGN) vary in ionizing output can provide insight into the physics of AGN accretion and fueling. "Green Bean" nebulae at z~0.3 surround powerful AGN that show evidence of having ramped down in ionizing output by 3-4 orders of magnitude over the past 10, 000-100, 000 years; this significant variability will be imprinted as an ionization echo within the surrounding extended emission line gas. Leveraging a successful recombination balance approach demonstrated previously for a sample of lower redshift Seyfert-class systems, we propose to obtain HST ACS ramp filter Halpha and [OIII] imaging and WFC3 continuum imaging of Green Bean nebulae in order to constrain the ionization histories of luminous AGN at high spatial, and therefore time, resolution. In addition, when combined with existing HST Lyman-alpha and UV continuum imaging of the Green Beans, the proposed observations will provide insight into the importance of Lyman-alpha resonant scattering within extended emission line nebulae, while benefitting from lower surface brightness dimming than at higher redshifts and avoiding the issue of geocoronal Lyman-alpha contamination that can plague local galaxy studies. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to obtain HST ACS ramp filter imaging of redshifted [OIII] and Halpha plus WFC3-UVIS and IR continuum imaging for six "Green Bean" nebulae at z~0.3 in order to map out the ionization histories of these luminous Active Galactic Nuclei (AGN) at high spatial, and therefore time, resolution. ~~ACS Ramp Filter Imaging~~ Filters -- Our targets are at z~0.281-0.341. We will use ramp filters FR656N and FR853N with central wavelengths set to match redshifted [OIII] and Halpha for each target. For FR656N, that corresponds to central wavelengths of 6416-6716A, and for FR853N, that corresponds to central wavelengths of 8409-8803A. Aperture -- For FR656N, we will use the default WFC1-MRAMP aperture. For FR853N, we will use the default WFC1-IRAMP aperture. 17831( 9) - 27-Mar-2026 13:02:33 - [ 2] Dither Pattern -- We do not need to dither over the chip gap. To minimize CTE issues, we will prioritize longer exposure times and use a 2-point ACS-WFC-DITHER-LINE dither pattern (#12 from the online ACS "Dither Strategies" manual). This will allow us to improve the sampling of the point spread function and help address image artifacts and cosmic rays. Exposure times -- Exposure times are set to maxmize on-target exposure during each orbit. ~~WFC3-UVIS Continuum Imaging~~~ Aperture -- To minimize CTE issues, we will use the UVIS2-C1K1C-CTE aperture. This aperture is centered ~20" from the edge of the image, and so will contain the full extent of each of our targets (4-9" in radius). Dither Pattern -- We do not need to dither over the chip gap. To minimize CTE issues, we will prioritize longer exposure times by using the default 2-point WFC3-UVIS-DITHER-LINE dither pattern. This will allow us to improve the sampling of the point spread function and help address image artifacts and cosmic rays. Flash -- In the case of one target (GB0113+0106), we apply a post-flash of FLASH=3 electrons, which is needed to achieve the recommended 20 electrons of background to minimize CTE issues given default background assumptions (low zodiacal light, average earth shine, average air glow). Exposure times -- Exposure times are set to maxmize on-target exposure during each orbit. ~~WFC3-IR Continuum Imaging~~~ Aperture -- We will use the standard IR aperture. We note that, due to the choice of the UVIS2-C1K1C-CTE aperture for UVIS, the IR and UVIS imaging will only partially overlap. However, this will allow us to obtain high resolution HST imaging for a larger number of surrounding galaxies, which will be useful for ancillary science on the local environments of our targets. Dither Pattern -- We will use the WFC3-IR-DITHER-BLOB dither pattern to address "IR blobs", and then the subpattern WFC3-IR-DITHER-LINE to improve the sampling of the point spread function and better address image artifacts and cosmic rays. Exposure times -- Exposure times are set by the combination of SAMP-SEQ and NSAMP. Based on the WFC3 Instrument Manual, for F098M (two targets) we need 586s exp to get to the background limited regime. Therefore, we will use SAMP-SEQ=SPARS50 and NSAMP=12, which is the maximum number of reads that will fit into the orbit, given 4 dither positions (WFC3-IR-DITHER-BLOB plus WFC3-IR-DITHER-LINE). For F105W (4 targets), we need 360s exp to get to the background limited regime, but we also want to maximize exposure time during the orbit. Therefore, we will use the same SAMP-SEQ=SPARS50 and NSAMP=12, the maximum number of reads 17831( 9) - 27-Mar-2026 13:02:33 - [ 3] that will fit into the orbit, given 4 dither positions (WFC3-IR-DITHER-BLOB plus WFC3-IR-DITHER-LINE). ------------------------------------------------------------------------------------ 17831( 9) - 27-Mar-2026 13:02:33 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GB0113+0106 GALAXY, EMISSION LINE RA=01H13M41.1100S, J2000 SDSSr=18.5 NEBULA, SEYFERT DEC=+01D06'8.53" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1155-0147 GALAXY, EMISSION LINE RA=11H55M44.5920S, J2000 SDSSr=17.9 NEBULA, SEYFERT DEC=-01D47'39.95" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 3 GB1347+5453 GALAXY, EMISSION LINE RA=13H47M9.1250S, J2000 SDSSr=18.7 NEBULA, SEYFERT DEC=+54D53'10.93" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 4 GB1455+0446 GALAXY, EMISSION LINE RA=14H55M33.6880S, J2000 SDSSr=18.5 NEBULA, SEYFERT DEC=+04D46'43.22" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 5 GB1505+1944 GALAXY, EMISSION LINE RA=15H05M17.6330S, J2000 SDSSr=17.9 NEBULA, SEYFERT DEC=+19D44'44.81" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 6 GB2240-0927 GALAXY, EMISSION LINE RA=22H40M24.1060S, J2000 SDSSr=18.3 NEBULA, SEYFERT DEC=-09D27'48.06" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 17831( 9) - 27-Mar-2026 13:02:33 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.149 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 34.25 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-BLOB WFC3-IR-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 5.183 0.636 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 41.788 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 17831( 9) - 27-Mar-2026 13:02:33 - [ 6] Visit: 01 (GB0113+0106 Ramp) Visit Requirements: 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 GB0113+0106 ACS/WFC ACCUM WFC1-MRAM FR656N 6416 1 1089 S PATTERN 1 1 P (2178 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GB0113+0106 ACS/WFC ACCUM WFC1-IRAM FR853N 8409 1 1144 S PATTERN 1 2 P (2288 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB0113+0106 1 ACS/WFC ACCUM WFC1-MRA FR656N 6416 1 none none none 1 N/A MP GB0113+0106 1 ACS/WFC ACCUM WFC1-MRA FR656N 6416 2 none none none 1 N/A MP GB0113+0106 2 ACS/WFC ACCUM WFC1-IRA FR853N 8409 1 none none none 2 N/A MP GB0113+0106 2 ACS/WFC ACCUM WFC1-IRA FR853N 8409 2 none none none 2 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 7] Visit: 02 (GB0113+0106 Broadband) Visit Requirements: 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 GB0113+0106 WFC3/UVI ACCUM UVIS2-C1K F763M FLASH=3 1 1241 S PATTERN 2 1 S 1C-CTE (2482 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GB0113+0106 WFC3/IR MULTIAC IR F098M SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 3 2 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB0113+0106 1 WFC3/UVI ACCUM UVIS2-C1 F763M 1 none none none 1 N/A S K1C-CTE GB0113+0106 1 WFC3/UVI ACCUM UVIS2-C1 F763M 2 none none none 1 N/A S K1C-CTE GB0113+0106 2 WFC3/IR MULTIAC IR F098M 1 1 none none 2 N/A CUM GB0113+0106 2 WFC3/IR MULTIAC IR F098M 1 2 none none 2 N/A CUM GB0113+0106 2 WFC3/IR MULTIAC IR F098M 2 1 none none 2 N/A CUM GB0113+0106 2 WFC3/IR MULTIAC IR F098M 2 2 none none 2 N/A CUM 17831( 9) - 27-Mar-2026 13:02:33 - [ 8] Visit: 03 (GB1155-0147 Ramp) Visit Requirements: 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 GB1155-0147 ACS/WFC ACCUM WFC1-MRAM FR656N 6541 1 1121 S GS ACQ SCENARIO BASE1O3; P (2242 S) PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1155-0147 ACS/WFC ACCUM WFC1-IRAM FR853N 8573 1 1112 S PATTERN 1 2 P (2224 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1155-0147 1 ACS/WFC ACCUM WFC1-MRA FR656N 6541 1 none none none 1 N/A MP GB1155-0147 1 ACS/WFC ACCUM WFC1-MRA FR656N 6541 2 none none none 1 N/A MP GB1155-0147 2 ACS/WFC ACCUM WFC1-IRA FR853N 8573 1 none none none 2 N/A MP GB1155-0147 2 ACS/WFC ACCUM WFC1-IRA FR853N 8573 2 none none none 2 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 9] Visit: 04 (GB1155-0147 Broadband) Visit Requirements: 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 GB1155-0147 WFC3/UVI ACCUM UVIS2-C1K F775W 1 1242 S GS ACQ SCENARIO BASE1O3; S 1C-CTE (2484 S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1155-0147 WFC3/IR MULTIAC IR F098M SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 3 2 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1155-0147 1 WFC3/UVI ACCUM UVIS2-C1 F775W 1 none none none 1 N/A S K1C-CTE GB1155-0147 1 WFC3/UVI ACCUM UVIS2-C1 F775W 2 none none none 1 N/A S K1C-CTE GB1155-0147 2 WFC3/IR MULTIAC IR F098M 1 1 none none 2 N/A CUM GB1155-0147 2 WFC3/IR MULTIAC IR F098M 1 2 none none 2 N/A CUM GB1155-0147 2 WFC3/IR MULTIAC IR F098M 2 1 none none 2 N/A CUM GB1155-0147 2 WFC3/IR MULTIAC IR F098M 2 2 none none 2 N/A CUM 17831( 9) - 27-Mar-2026 13:02:33 - [ 10] Visit: 05 (GB1347+5453 Ramp) Visit Requirements: 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 GB1347+5453 ACS/WFC ACCUM WFC1-MRAM FR656N 6671 1 1126 S PATTERN 1 1 P (2252 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1347+5453 ACS/WFC ACCUM WFC1-IRAM FR853N 8744 1 1181 S PATTERN 1 2 P (2362 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1347+5453 1 ACS/WFC ACCUM WFC1-MRA FR656N 6671 1 none none none 1 N/A MP GB1347+5453 1 ACS/WFC ACCUM WFC1-MRA FR656N 6671 2 none none none 1 N/A MP GB1347+5453 2 ACS/WFC ACCUM WFC1-IRA FR853N 8744 1 none none none 2 N/A MP GB1347+5453 2 ACS/WFC ACCUM WFC1-IRA FR853N 8744 2 none none none 2 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 11] Visit: 06 (GB1347+5453 Broadband) Visit Requirements: 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 GB1347+5453 WFC3/UVI ACCUM UVIS2-C1K F775W 1 1281 S GS ACQ SCENARIO BASE1O3; S 1C-CTE (2562 S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1347+5453 WFC3/IR MULTIAC IR F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 3 2 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1347+5453 1 WFC3/UVI ACCUM UVIS2-C1 F775W 1 none none none 1 N/A S K1C-CTE GB1347+5453 1 WFC3/UVI ACCUM UVIS2-C1 F775W 2 none none none 1 N/A S K1C-CTE GB1347+5453 2 WFC3/IR MULTIAC IR F105W 1 1 none none 2 N/A CUM GB1347+5453 2 WFC3/IR MULTIAC IR F105W 1 2 none none 2 N/A CUM GB1347+5453 2 WFC3/IR MULTIAC IR F105W 2 1 none none 2 N/A CUM GB1347+5453 2 WFC3/IR MULTIAC IR F105W 2 2 none none 2 N/A CUM 17831( 9) - 27-Mar-2026 13:02:33 - [ 12] Visit: 07 (GB1455+0446 Ramp) Visit Requirements: 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 GB1455+0446 ACS/WFC ACCUM WFC1-MRAM FR656N 6681 1 1121 S PATTERN 1 1 P (2242 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1455+0446 ACS/WFC ACCUM WFC1-IRAM FR853N 8757 1 1112 S PATTERN 1 2 P (2224 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1455+0446 1 ACS/WFC ACCUM WFC1-MRA FR656N 6681 1 none none none 1 N/A MP GB1455+0446 1 ACS/WFC ACCUM WFC1-MRA FR656N 6681 2 none none none 1 N/A MP GB1455+0446 2 ACS/WFC ACCUM WFC1-IRA FR853N 8757 1 none none none 2 N/A MP GB1455+0446 2 ACS/WFC ACCUM WFC1-IRA FR853N 8757 2 none none none 2 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 13] Visit: 08 (GB1455+0446 Broadband) Visit Requirements: 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 GB1455+0446 WFC3/UVI ACCUM UVIS2-C1K F775W 1 1244 S GS ACQ SCENARIO BASE1O3; S 1C-CTE (2488 S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1455+0446 WFC3/IR MULTIAC IR F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 3 2 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1455+0446 1 WFC3/UVI ACCUM UVIS2-C1 F775W 1 none none none 1 N/A S K1C-CTE GB1455+0446 1 WFC3/UVI ACCUM UVIS2-C1 F775W 2 none none none 1 N/A S K1C-CTE GB1455+0446 2 WFC3/IR MULTIAC IR F105W 1 1 none none 2 N/A CUM GB1455+0446 2 WFC3/IR MULTIAC IR F105W 1 2 none none 2 N/A CUM GB1455+0446 2 WFC3/IR MULTIAC IR F105W 2 1 none none 2 N/A CUM GB1455+0446 2 WFC3/IR MULTIAC IR F105W 2 2 none none 2 N/A CUM 17831( 9) - 27-Mar-2026 13:02:33 - [ 14] Visit: 09 (GB1505+1944 Ramp) Visit Requirements: 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 GB1505+1944 ACS/WFC ACCUM WFC1-MRAM FR656N 6716 1 1130 S PATTERN 1 1 P (2260 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1505+1944 ACS/WFC ACCUM WFC1-IRAM FR853N 8803 1 1121 S PATTERN 1 2 P (2242 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1505+1944 1 ACS/WFC ACCUM WFC1-MRA FR656N 6716 1 none none none 1 N/A MP GB1505+1944 1 ACS/WFC ACCUM WFC1-MRA FR656N 6716 2 none none none 1 N/A MP GB1505+1944 2 ACS/WFC ACCUM WFC1-IRA FR853N 8803 1 none none none 2 N/A MP GB1505+1944 2 ACS/WFC ACCUM WFC1-IRA FR853N 8803 2 none none none 2 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 15] Visit: 10 (GB1505+1944 Broadband) Visit Requirements: 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 GB1505+1944 WFC3/UVI ACCUM UVIS2-C1K F775W 1 1251 S GS ACQ SCENARIO BASE1O3; S 1C-CTE (2502 S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB1505+1944 WFC3/IR MULTIAC IR F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 3 2 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1505+1944 1 WFC3/UVI ACCUM UVIS2-C1 F775W 1 none none none 1 N/A S K1C-CTE GB1505+1944 1 WFC3/UVI ACCUM UVIS2-C1 F775W 2 none none none 1 N/A S K1C-CTE GB1505+1944 2 WFC3/IR MULTIAC IR F105W 1 1 none none 2 N/A CUM GB1505+1944 2 WFC3/IR MULTIAC IR F105W 1 2 none none 2 N/A CUM GB1505+1944 2 WFC3/IR MULTIAC IR F105W 2 1 none none 2 N/A CUM GB1505+1944 2 WFC3/IR MULTIAC IR F105W 2 2 none none 2 N/A CUM 17831( 9) - 27-Mar-2026 13:02:33 - [ 16] Visit: 11 (GB2240-0927 Ramp) Visit Requirements: 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 GB2240-0927 ACS/WFC ACCUM WFC1-MRAM FR656N 6641 1 1126 S GS ACQ SCENARIO BASE1O3; P (2252 S) PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB2240-0927 ACS/WFC ACCUM WFC1-IRAM FR853N 8705 1 1115 S PATTERN 1 2 P (2230 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB2240-0927 1 ACS/WFC ACCUM WFC1-MRA FR656N 6641 1 none none none 1 N/A MP GB2240-0927 1 ACS/WFC ACCUM WFC1-MRA FR656N 6641 2 none none none 1 N/A MP GB2240-0927 2 ACS/WFC ACCUM WFC1-IRA FR853N 8705 1 none none none 2 N/A MP GB2240-0927 2 ACS/WFC ACCUM WFC1-IRA FR853N 8705 2 none none none 2 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 17] Visit: 12 (GB2240-0927 Broadband) Visit Requirements: 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 GB2240-0927 WFC3/UVI ACCUM UVIS2-C1K F775W 1 1247 S GS ACQ SCENARIO BASE1O3; S 1C-CTE (2494 S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GB2240-0927 WFC3/IR MULTIAC IR F105W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 3 2 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB2240-0927 1 WFC3/UVI ACCUM UVIS2-C1 F775W 1 none none none 1 N/A S K1C-CTE GB2240-0927 1 WFC3/UVI ACCUM UVIS2-C1 F775W 2 none none none 1 N/A S K1C-CTE GB2240-0927 2 WFC3/IR MULTIAC IR F105W 1 1 none none 2 N/A CUM GB2240-0927 2 WFC3/IR MULTIAC IR F105W 1 2 none none 2 N/A CUM GB2240-0927 2 WFC3/IR MULTIAC IR F105W 2 1 none none 2 N/A CUM GB2240-0927 2 WFC3/IR MULTIAC IR F105W 2 2 none none 2 N/A CUM 17831( 9) - 27-Mar-2026 13:02:33 - [ 18] Visit: 53 (GB1155-0147 Ramp) Visit Requirements: On Hold Comments: Additional Comments: HOPR repeat of orbit 1 of visit 3 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 GB1155-0147 ACS/WFC ACCUM WFC1-MRAM FR656N 6541 1 1121 S GS ACQ SCENARIO BASE1O3; P (2242 S) PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1155-0147 1 ACS/WFC ACCUM WFC1-MRA FR656N 6541 1 none none none 1 N/A MP GB1155-0147 1 ACS/WFC ACCUM WFC1-MRA FR656N 6541 2 none none none 1 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 19] Visit: 54 (GB2240-0927 Ramp) Visit Requirements: 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 GB2240-0927 ACS/WFC ACCUM WFC1-IRAM FR853N 8705 1 1115 S PATTERN 1 1 P (2230 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB2240-0927 1 ACS/WFC ACCUM WFC1-IRA FR853N 8705 1 none none none 1 N/A MP GB2240-0927 1 ACS/WFC ACCUM WFC1-IRA FR853N 8705 2 none none none 1 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 20] Visit: 55 (GB2240-0927 Ramp) Visit Requirements: On Hold Comments: Additional Comments: HOPR copy of visit 54 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 GB2240-0927 ACS/WFC ACCUM WFC1-IRAM FR853N 8705 1 1115 S PATTERN 1 1 P (2230 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB2240-0927 1 ACS/WFC ACCUM WFC1-IRA FR853N 8705 1 none none none 1 N/A MP GB2240-0927 1 ACS/WFC ACCUM WFC1-IRA FR853N 8705 2 none none none 1 N/A MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 21] Visit: 56 (GB1505+1944 Ramp) Visit Requirements: On Hold Comments: Additional Comments: HOPR copy of visit 9 (orbit 2) 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 GB1505+1944 ACS/WFC ACCUM WFC1-IRAM FR853N 8803 1 1121 S PATTERN 1 1 P (2218 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 | ------------------------------------------------------------------------------------------------------------------------------------ GB1505+1944 1 ACS/WFC ACCUM WFC1-IRA FR853N 8803 1 none none none 1 N/A MP GB1505+1944 1 ACS/WFC ACCUM WFC1-IRA FR853N 8803 2 none none none 1 1097.0 S MP 17831( 9) - 27-Mar-2026 13:02:33 - [ 22] Summary Form for Proposal 17831 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2-C1K1C-CTE, WFC1-IRAMP, WFC1-MRAMP ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=3, NSAMP=12, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1O3, PATTERN 1 1, PATTERN 1 2, PATTERN 2 1, PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F098M, F105W, F763M, F775W, FR656N, FR853N ------------------------------------------------------------------------------------------------------------------------------------ Target Names GB0113+0106, GB1155-0147, GB1347+5453, GB1455+0446, GB1505+1944, GB2240-0927 ------------------------------------------------------------------------------------------------------------------------------------