0 Assigned ID: 5790 ----- Attempting Submission 1 (Tue Mar 26 22:58:39 GMT 2024) ----- HST Phase I Proposal 5790 successfully submitted. Receipt: # 5790-1 ----- Attempting Submission 2 (Tue Mar 26 23:37:00 GMT 2024) ----- HST Phase I Proposal 5790 successfully submitted. Receipt: # 5790-2 ----- Attempting Submission 3 (Tue Mar 26 23:48:43 GMT 2024) ----- HST Phase I Proposal 5790 successfully submitted. Receipt: # 5790-3 The number of orbits used exceeds the number allocated New visits 08 and 09 are added as replacements for failed visits 01 and 02, as awarded by the Telescope Time Review Board on December 2nd, 2024 (HOPR reference: 93011). 619165029 ----- Attempting Submission 1 (Mon Aug 12 17:29:52 GMT 2024) ----- ----- Attempting Submission 2 (Tue Oct 29 19:17:34 GMT 2024) ----- HST Phase II Proposal 17726 successfully submitted. Receipt: # 17726-2 ----- Attempting Submission 3 (Tue Oct 29 19:27:33 GMT 2024) ----- ----- Attempting Submission 4 (Fri Dec 06 13:57:25 GMT 2024) ----- The APT tool marks Visit 02 as "Completed", leading to an orbit number exceeding the allocated number of orbits. However, this visit suffered a guide-star loss of lock, resulting in loss of observations (cf. approved HOPR 93011). Visit 01 is correctly identified as "Failed" in APT. Time delay cosmography with strong cluster lenses We propose to assemble a complete data set of HST and JWST imaging for the complete known sample of 8 gravitational lens systems where a variable quasar is multiply lensed by a cluster of galaxies. Such lens systems produce image separations and time delays an order of magnitude larger than the much more common galaxy-scale lensed quasars. All these systems are targets of completed or ongoing photometric monitoring programs, allowing us to measure time delays between the lensed quasar images. Time delay values with 1-2% uncertainty have already been measured in half of these lens systems, and preliminary time delays are available for all; similar precision will be reached in the remaining systems within ~2 years. The long time delays, coupled with space-based imaging which provide a large number of additional lensing mass constraints from image families of lensed sources at different redshifts, make these cluster-lensed quasars spectacular targets for determining the Hubble constant H0. The Refsdal method, based on measuring time delays between multiple, strongly gravitationally lensed images of variable sources can provide unique insight into the origin of the intriguing "Hubble tension" between local distance ladder and cosmic microwave background-based determinations of H0. To enable such H0 measurements for the full sample of 8 lensed quasars, we request HST imaging for three systems with no prior space-based data, complemented by JWST imaging at longer wavelengths for the full sample of 8 lenses, as well as modest archival support, to construct precise and accurate models of the lensing mass distribution across the entire sample and derive a joint H0 measurement. UPDATE DECEMBER 6th, 2024: New visits 08 and 09 are added as replacements for failed visits 01 and 02, as awarded by the Telescope Time Review Board on December 2nd, 2024 (HOPR reference: 93011). ---- This program consists of 14 orbits of broad-band imaging, spread over 7 visits, each with 2 orbits per visit. Each visit uses a single filter. Visits 01-06 and 08-09: ACS/WFC imaging. This is programmed as a 2-orbit visit, with a total of 8 frames obtained, dithering along a line with a gap-crossing dither step for each additional frame. For each orbit, the POS TARG option is used to implement an initial offset from the center of ACS/WFC chip 1. The purpose of this offset is to move the center of the strong-lens high-magnification region (which coincides with the provided J2000 target coordinates) somewhat closer to the center of the full WFC field, while also avoiding the part of the chip most affected by CTE effects. This offset is small enough that the region where we expect to find multiple images of gravitationally lensed sources will still be on the same ACS chip as the cluster center for any ORIENT value. Each orbit employs a ACS-WFC-DITHER-BOX pattern to allow for drizzling/sub-sampling and better modelling of the PSF. The two orbits have different POS TARG values, yielding a relative shift between the orbits that ensures that all positions in the chip gap region are covered by at least 6 exposures, ensuring efficient removal of artifacts such as cosmic rays and CTE effects. Visit 07: WFC3/UVIS imaging. This two-orbit visit is dedicated to WFC3-UVIS imaging in the F390W filter. A total of 4 exposures are made across two orbits, emplying a WFC3-UVIS-GAP-LINE dither pattern to ensure that all positions in the inter-chip region is covered by at least 3 exposures. The POS TARG option is used to apply an initial offset of the target away from the center of WFC3/UVIS chip 2 towards the center of the full WFC3/UVIS field. This offset is small enough that the entire sky region where we expect to find multiple images of gravitationally lensed sources will remain on chip2 for any ORIENT value. A Post Flash of 7 e- is applied to mitigate CTE effects. Possible impact of potential reduced gyro operations: We do not require a specific roll angle for these observations. Also, the roll angles for separate visits of the same field need not be the same. This should maximise the schedulability of the observations, even for the case where the observing windows are further limited by reduced gyro mode (the impact of a reduced gyro mode on limiting the spatial scan speed should also not have a significant effect on our fixed target observations). Our collaboration has extensive experience with interpreting and modeling lensing clusters (e.g., Dahle et al. 2013, ApJ, 773, 146; Sharon et al. 2012, ApJ, 746, 161; Gladders et al. 2013, ApJ, 764, 177, Bayliss et al. 2011, ApJS, 193, 8). Co-I K. Napier, is, as part of her PhD thesis at the University of Michigan, leading an investigation of Hubble constant measurement from cluster-lensed quasars (Napier et al. 2023a, ApJ), which is funded through HST Cycle 28 archival program, AR-16150 (PI: Sharon). She published the discovery paper of COOLJ0335-1927 (Napier et al. 2023b, ApJL). Napier is also the PI of a related joint Chandra-HST program (HST GO-17243) for the cluster-lensed quasar COOLJ0542-2125. co-I Sharon is an expert on strong lens modelling, with extensive experience from building lens models based on multi-band HST imaging. She has worked extensively on several of the previously known lens systems where quasars are lensed by galaxy clusters: The first large separation lensed quasar SDSSJ1004 (Sharon et al. 2005, ApJ, 629, L73), and the sextuply lensed SDSSJ2222 which was discovered by our collaboration (Dahle et al. 2013, ApJ, 773, 146; Sharon et al. 2017, ApJ, 835, 5). Dr. Sharon was PI of a similar HST program (#13337) "Resolving the Cluster-Lensed Sextuple Quasar SDSSJ2222+2745", also including Co-Is Gladders, Bayliss and Dahle. This work has led to multiple publications, including : * Sharon et al. (2017, ApJ, 835, 5): "Lens Model and Time Delay Predictions for the Sextuply Lensed Quasar SDSS J2222+2745". * Bayliss et al. (2017, ApJ, 845, L14): "Spatially Resolved Patchy Lyman-alpha Emission within the Central Kiloparsec of a Strongly Lensed Quasar Host Galaxy at z = 2.8". P.I. Dahle has led a successful photometric monitoring campaign to measure time delays for the cluster-lensed quasar SDSSJ2222+2745 (the first two time delays were published in Dahle et al. 2015, ApJ, 813, 67) and is currently leading similar efforts for all our proposed HST targets, using the 2.56m Nordic Optical Telescope. He has been PI of three previous HST programmes targeting galaxies gravitationally lensed by galaxy clusters, see e.g. Rivera-Thorsen et al. 2019, Science 366, 738. Prof. Gladders is a galaxy cluster and strong lensing expert, with extensive experience in data handling and analysis (spectroscopic and photometric) and a publication record of currently 238 refereed papers. He has built two instruments for the Magellan telescopes, and is an active user of many of the world's largest telescopes, HST and JWST. His research group at the University of Chicago is focused on exploiting emerging galaxy clusters and strong lensing samples to answer questions about galaxy and structure formation and evolution. This effort led to the discovery of all the COOL J**** targets. Gladders is the PI of an approved HST program to observe our most recently discovered lensed quasar, COOL J1153+0755 (GO-17431). Dr. Mahler is an expert in strong lensing with ample experience in modeling complex galaxy clusters (including the Hubble Frontier Fields, RELICS, and JWST-ERO SMACS1703; Mahler et al. 2018, 2019, 2020, 2023a,b). He is part of the LENSTOOL development team, and is an expert in MUSE IFU spectroscopy analysis. Co-I A. Cloonan is deriving precise constraints on quasar and host galaxy observables for the current sample of large separation cluster-lensed quasars (Cloonan et al. 2024, in prep). Dr. Rivera-Thorsen is the PI of JWST Cycle 1 program "How do ionizing photons escape the Sunburst Arc?". He is an expert in observational studies of galaxies at cosmic noon and their interstellar medium (Rivera-Thorsen et al. 2017a,b, 2019, 2022). Dr. Khullar is an expert on star formation histories of quiescent galaxies in galaxy clusters and high-redshift lensed galaxies, and in stellar population synthesis modeling techniques using spectrophotometric data. Dr. Khullar is the PI of JWST Cycle 1 GO 2566 "Characterizing Stellar Mass Assembly and Physical Properties in the Brightest Galaxy in the Redshift >5 Universe" and Co-PI of Cycle 2 GO 4125 program "Galaxies Under Construction: Resolved Scaling Relations and Stellar Mass Assembly as Revealed by Lensed Star-Forming Clumps at Cosmic Noon". Dr. Michael Florian is an expert on the formation and evolution of galaxies, specifically the interstellar medium conditions and morphological characteristics of high-redshift galaxies. He is PI of Cycle 2 GO 4125 program "Galaxies Under Construction: Resolved Scaling Relations and Stellar Mass Assembly as Revealed by Lensed Star-Forming Clumps at Cosmic Noon". Dr. Florian is also a member of the NIRCam instrument design team at Steward Observatory. Dr Hutchison is an expert in studying the physical conditions of distant galaxies using near-infrared MSA spectroscopy of galaxies at z>7 (and more recently, IFU spectroscopy at z~1-4). She has deep working knowledge in data reduction of ground- and space-based NIR spectroscopic data, and has extensive experience with photoionization modeling of the properties of high-redshift galaxies. Dr. J. Rigby is an expert on spectroscopic diagnostics of star formation, the study of lensed galaxies, galaxy evolution and active galactic nuclei, and the scientific performance of JWST. She is co-PI for the JWST Cycle 1 ERS programme "TEMPLATES: Targeting Extremely Magnified Panchromatic Lensed Arcs and Their Extended Star formation". Dr. Welch is an expert in the study of high redshift lensed galaxies, galaxy evolution and extremely magnified stars using HST and JWST. Large Scale Structure of the Universe Supermassive Black Holes and Active Galaxies 6 false true false false false false true false false false false 11.5 true SUPPORTED CLUSTER OF GALAXIES GRAVITATIONAL LENS HIGH REDSHIFT CLUSTER POOR CLUSTER J2000 J2000 brightest quasar image, g=21.8; r=21.4 (variable) CLUSTER OF GALAXIES GRAVITATIONAL LENS RICH CLUSTER J2000 J2000 brightest quasar image, g=20.95; r=20.75 (variable) CLUSTER OF GALAXIES GRAVITATIONAL LENS RICH CLUSTER J2000 J2000 brightest quasar image, g=21.8; r=21.2 (variable) ACS/WFC Imaging No No F435W ACS/WFC Imaging No No F606W WFC3/UVIS Imaging No No F390W ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F625W ACS/WFC Imaging No No F475W ACS/WFC Imaging No No F625W POS-TARG DITHER 0.265 LINE 5.011 false false 69.02 4 20.7 ACS-WFC-DITHER-BOX 1 false POS-TARG DITHER DITHER 4 2.414 WFC3-UVIS-DITHER-BOX false 81.785 false 0.112 0.173 4 85.759 POS-TARG WFC3-UVIS-GAP-LINE 23.884 3 false The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. 1731533592000 282.2297182794337 (Tic-Visit :proposal-id 17726 :visit-id "01" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:07:49.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "01" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2668 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "01" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. /private/var/folders/zm/zc24ylb90b3gdg50_fmr4cbw0000gp/T/OPVisit2958788523457682980.xml (Tic-Visit :proposal-id 17726 :visit-id "08" :proposal-version -1 :trans-version "20240604" :date "06-Dec-2024 14:18:58.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "08" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2668 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "08" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. 1731788917000 282.2297182794337 (Tic-Visit :proposal-id 17726 :visit-id "02" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:07:50.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2668 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "02" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. /private/var/folders/zm/zc24ylb90b3gdg50_fmr4cbw0000gp/T/OPVisit6943469136184441365.xml (Tic-Visit :proposal-id 17726 :visit-id "09" :proposal-version -1 :trans-version "20240604" :date "06-Dec-2024 14:20:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "09" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2668 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "09" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2669 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3049 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17726 :visit-id "03" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:07:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2680 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3062 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "03" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2681 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3062 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17726 :visit-id "04" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:07:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2680 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3062 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "04" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2681 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3062 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17726 :visit-id "05" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:07:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "05" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2643 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "05" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2642 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17726 :visit-id "06" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:07:52.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 2273792 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "06" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "06" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2641 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3023 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 32.1.3. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17726 :visit-id "07" :proposal-version -1 :trans-version "20240604" :date "29-Oct-2024 20:02:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17726 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17726 :visit-id "07" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2761 :al-overhead-at-end 121 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3062 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17726 :visit-id "07" :orbit-number 2 :pcs-time 301 :si-vis-utilization 2760 :al-overhead-at-end 121 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3062 :pcs-gap 0 ) true 2 0