0 Assigned ID: 1291 ----- Attempting Submission 1 (Sat Oct 01 03:58:18 GMT 2016) ----- HST Phase I Proposal 1291 (Highz_dropouts.apt) successfully submitted. Receipt: # 1291-1 0 ----- Attempting Submission 1 (Thu Dec 15 05:04:31 GMT 2016) ----- HST Phase II Proposal 14896 (dropouts_phaseII_v6.apt) successfully submitted. Receipt: # 14896-1 ----- Attempting Submission 2 (Thu Dec 15 19:30:59 GMT 2016) ----- HST Phase II Proposal 14896 (dropouts_phaseII_v7.apt) successfully submitted. Receipt: # 14896-2 ----- Attempting Submission 3 (Fri Dec 16 22:56:58 GMT 2016) ----- Precise Photometric Redshifts For Two Bright z>8 Galaxies Deep field observations with the Hubble Space Telescope have revealed several hundred z>8 galaxy candidates in the universe's first billion years, but few if any are bright enough (H<24.5 AB) for detailed, high-S/N spectroscopic follow-up study with the James Webb Space Telescope. With the JWST launch fast-approaching it is essential that we make every attempt to identify as many bright high-z galaxies as possible to feed early science programs. With this is mind, we are proposing for WFC3/IR imaging observations of two exceptionally bright (H~24 AB) candidate z~8-10 dropout galaxies that were only recently identified in September 2016. Both targets are detected in H-band imaging and drop out strongly in blue bands. A preliminary Bayesian photo-z analysis of existing data reveals a a high probability that both sources are z>8, but cannot provide precise photometric redshift constraints. We propose for HST/WFC3 + ACS imaging to obtain the multi-band imaging necessary to recover precise photometric redshifts for these two dropout galaxies. The goal of this proposal is to obtain imaging of two fields in a total of six HST imaging bands, spanning 0.6-1.7 microns, to precisely constrain the photometric redshifts of two bright candidate z>8 galaxies. For one of the candidates we already have archival imaging in three bands, and only require new 2 orbits of WFC3/IR observations. The other candidate requires 2 orbits of WFC3/IR plus one orbit of WCS imaging. We have arranged the observations to fit into two visits, one for each target. If it makes the scheduling easier, however, we could easily split the 3-orbit observation into two visits (2 orbits of WFC3/IR and 1 separate orbit of ACS/WFC). In all of these observations we dither manually between several positions using the POS-TARG field in the special requirements for each exposure. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 14896 :visit-id "02" :proposal-version -1 :trans-version "20160601" :date "14-Dec-2016 23:30:17.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2280544 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14896 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14896 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2865 :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 3245 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14896 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3015 :al-overhead-at-end 0 :internal-dur-at-end 633 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3245 :pcs-gap 0 ) true 2 0