0 Assigned ID: 681 ----- Attempting Submission 1 (Fri Apr 07 17:38:02 GMT 2017) ----- First submission, with observations fully specified. 916692803 ----- Attempting Submission 1 (Fri Jul 07 14:16:16 GMT 2017) ----- The Brightest Galaxy-Scale Lens We have very recently discovered the brightest galaxy-scale lens known to date (r = 18.7). This system is ideally suited for spatially resolved studies of the source galaxy at a redshift z = 2.8, i.e., the peak epoch of star formation. Such bright galaxy-scale lenses are key to constraining the evolutionary processes which take place at these redshifts owing to their high magnifications and simple lensing mass distributions; furthermore, they allow an extremely sensitive probe of dark substructures within the lensing galaxy. The requested deep, high-resolution imaging will be used to robustly infer the lensing potential and `de-lens' the galaxy to probe its structure on scales as small as ~20 pc, and will greatly facilitate future spectroscopic observations with, for example, JWST. We are observing a galaxy-scale strong gravitational lens. Our goal is to get excellent spatial resolution imaging of the foreground lensing galaxy and background lensed source. We will therefore use a 4-point box dither to achieve excellent sampling and reject detector artefacts and cosmic ray hits. Galaxies and the IGM 6 false false false false false false SUPPORTED GALAXY GRAVITATIONAL LENS J2000 J2000 WFC3/UVIS Imaging No No F606W POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false /tmp/OPVisit1284499471913183068.xml The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15223 :visit-id "01" :proposal-version -1 :trans-version "20170613" :date "07-Jul-2017 15:12:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15223 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15223 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2964 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3298 :pcs-gap 0 ) true 1 0