The number of orbits used exceeds the number allocated Resubmission for repeat of failed visit A1 of 47Tuc -167532598 ----- Attempting Submission 1 (Wed Nov 20 18:27:02 GMT 2024) ----- ----- Attempting Submission 2 (Mon Sep 29 16:44:07 GMT 2025) ----- ----- Attempting Submission 3 (Tue Oct 28 17:43:24 GMT 2025) ----- CoI's added as usual, warning can be disregarded. WFC3 IR Time-Dependent Sensitivity: Clusters We continue the monitoring of the sensitivity of the WFC3/IR channel using relative photometry of the clusters M-4 and 47 Tuc, as performed in HST programs 16864, 16512, 17260, and 17363. This program serves to complement the sensitivity change slopes from the M35 scans, G102/G141 measurements, and standard star photometric monitoring. We observe the same targets as 17260 (M4 and 47 Tuc external fields) and use similar observation strategies, though some exposures were necessarily shortened due to the reduced gyro mode effects on orbital visibility length. As 47 Tuc was imaged twice in the previous cycle, we swap to observing M4 twice and 47 Tuc once to keep a roughly balanced cadence. These observations will help constrain the time dependent sensitivity change through 2025, as well as provide a rich dataset for examining other detector behaviors. These observations use a very similar observing strategy as seen in 17260 as well as 17363. For the M4 visits, the two F110W exposures remain the same, however the second of the F160W exposures was shortened to fit within the shorter orbit. For 47 Tuc the dark exposure in the middle of the visit was shortened from NSAMP = 15 to NSAMP=8 to fit within the shortened orbit. The M4 visits consist of 4 exposures, starting with two F110W and ending with two F160W exposures. The F110W exposures will use the SPARS50 sample sequence with 14 samples. The F160W exposures will only use 13 and then 10 samples, due to the shorter orbital length due to RGM After each exposure POSTARGS of 2.5" will be applied, to mitigate self persistence. The 47 Tuc observations match the observing strategy from 13563 of alternating F160W exposures of the cluster with dark frames. Though the dark frames are unecessary for this monitoring, we keep them to specifically keep consistent detector conditions, to eliminate systematics due to observation strategy differences. 0 false false RESTRICTED CALIBRATION DETECTOR LINEARITY TEST NGC104 J2000 STELLAR CLUSTER GLOBULAR CLUSTER J2000 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. 1757205221000 318.0 (Tic-Visit :proposal-id 17683 :visit-id "01" :proposal-version -1 :trans-version "20240604" :date "30-Oct-2024 18:32:53.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1584208 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17683 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17683 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2369 :al-overhead-at-end 0 :internal-dur-at-end 690 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3184 :pcs-gap 0 ) true 1 0 Designed to just saturate V=20 stars. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. 1761157539000 30.0 (Tic-Visit :proposal-id 17683 :visit-id "A1" :proposal-version -1 :trans-version "20250624" :date "29-Sep-2025 12:43:09.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1566800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17683 :visit-id "A1" :obset-id "A1" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17683 :visit-id "A1" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2319 :al-overhead-at-end 0 :internal-dur-at-end 690 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3121 :pcs-gap 0 ) true 1 0 Designed to just saturate V=20 stars. The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. /private/var/folders/9h/w0qtd2411j31xsnqg6q_17hh0005_j/T/OPVisit9132042651929689972.xml (Tic-Visit :proposal-id 17683 :visit-id "B1" :proposal-version -1 :trans-version "20250624" :date "28-Oct-2025 12:08:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1566800 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17683 :visit-id "B1" :obset-id "B1" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17683 :visit-id "B1" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2319 :al-overhead-at-end 0 :internal-dur-at-end 690 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3121 :pcs-gap 0 ) true 1 0 Designed to just saturate V=20 stars. The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. 1738109714000 280.0 (Tic-Visit :proposal-id 17683 :visit-id "02" :proposal-version -1 :trans-version "20240604" :date "30-Oct-2024 18:33:00.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 957472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17683 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17683 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2611 :al-overhead-at-end 0 :internal-dur-at-end 728 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. 1744468093000 282.0 (Tic-Visit :proposal-id 17683 :visit-id "03" :proposal-version -1 :trans-version "20240604" :date "30-Oct-2024 18:33:02.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 957472 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17683 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17683 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2611 :al-overhead-at-end 0 :internal-dur-at-end 728 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3032 :pcs-gap 0 ) true 1 0