0 Assigned ID: 553 ----- Attempting Submission 1 (Fri Apr 11 16:15:20 GMT 2014) ----- HST Phase I Proposal 553 (highz_hosts_c22_v1.apt) successfully submitted. ----- Attempting Submission 2 (Fri Apr 11 21:48:28 GMT 2014) ----- Please find attached our first submission of 13831. -301534786 ----- Attempting Submission 1 (Wed Jul 23 13:44:45 GMT 2014) ----- GRB hosts and the search for missing star formation at high redshift Measuring the star formation rate (SFR) at high redshift is crucial for understanding cosmic reionization and the formation of galaxies at early times. Two common, complementary approaches are Lyman-Break-Galaxy (LBG) surveys, providing large samples, and Gamma-Ray-Bursts (GRBs) which can sign-post star formation even in the smallest galaxies. Recent results of both methods have found evidence for a dominant population of very faint star-forming galaxies at z>5, representing a continuation of the steepening of the galaxy luminosity function with redshift. However, LBG surveys are affected by possible incompleteness and contamination, while the magnitude limit means very large correction factors must be applied to account for these unseen galaxies. On the other hand GRBs suffer small number statistics and have their own selection biases. We propose to construct a new sample of six 6<z<8.2 GRB hosts with deep imaging in order to assess the proportion of star formation in very faint galaxies during at this key epoch. This is a critical issue, since only if faint galaxies dominate global star formation can UV light from stars sustain reionization. We will carry out WFC3/IR (F140W) imaging to a limit approaching that of the current HUDF observations (M(AB)~-18) in all cases. Prior knowledge of the exact locations and redshifts of the targets means that this can be achieved relatively economically, since we can accept a lower level of significance and single filter. This method depends only on GRBs and SF tracing UV light (both likely at high-z), and in turn will constrain the completeness correction to be applied to LBG surveys in order to derive the ionizing photon budget. The aim of this proposal is to obtain deep observations of the host galaxies of high redshift z>~6 GRBs. We will utilize the F140W filter exclusively for its depth, and will obtain observations of 5 targets with exposure times of 5 orbits (050904), 4 orbits (120521C, 130606A, 140515A) and 3 orbits (080913, with a shorter exposure time due to pre-existing data). We will utilize a 3-point dither pattern within each orbit, with the dither_blob pattern executed as pos-targs between each orbit to step over the IR blobs. We also introduce an additional 3.5 pixel shift in the x-axis such that in a 4 orbit observation we essentially obtain an optimal 6 point dither pattern at each of the dither_blob positions (i.e. 12 points in total). For the 5 orbit visit we repeat the first base position of the pattern, and for the 3 orbit visit we do not include the fourth position, but will still obtain a 9-point dither. We utilize the STEP read sequence within each orbit in order to obtain dynamic range to map ground based observations to the same co-ordinate system as the HST imaging. For GRB 120521C, GRB 080913 and GRB 050904 we have also introduced some roll angle constraints to avoid the risks of contamination from diffraction spikes of bright stars. COSMOLOGY 12 false false 0.0 0.0 false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 H(AB)~29 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H(AB)~29 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H(AB)~29 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H(AB)~29 GALAXY HIGH REDSHIFT GALAXY J2000 J2000 H(AB)~29 WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W WFC3/IR Imaging No No F140W POS-TARG DITHER 0.605 LINE false false 3 41.788 WFC3-IR-DITHER-LINE-3PT 6 false The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/ql/9t0yvtlx6jj67fltdg94b0_40000gn/T/OPVisit1531476361959496918.xml (Tic-Visit :proposal-id 13831 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "23-Jul-2014 14:40:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3342464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13831 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13831 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2863 :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 3316 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2863 :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 3316 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2863 :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 3316 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2863 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3316 :pcs-gap 0 ) true 4 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /Users/levan/hst_c22/OP-cache/13831_v3-v02.xml (Tic-Visit :proposal-id 13831 :visit-id "02" :proposal-version -1 :trans-version "20140605" :date "22-Jul-2014 11:45:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3342464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13831 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13831 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2863 :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 3231 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "02" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2863 :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 3231 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "02" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2863 :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 3231 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "02" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2863 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3231 :pcs-gap 0 ) true 4 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /Users/levan/hst_c22/OP-cache/13831_v3-v03.xml (Tic-Visit :proposal-id 13831 :visit-id "03" :proposal-version -1 :trans-version "20140605" :date "22-Jul-2014 11:45:40.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 4 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 3342464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13831 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13831 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2863 :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 3241 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "03" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2863 :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 3241 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "03" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2863 :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 3241 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "03" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2863 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3241 :pcs-gap 0 ) true 4 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/ql/9t0yvtlx6jj67fltdg94b0_40000gn/T/OPVisit958435525605382505.xml (Tic-Visit :proposal-id 13831 :visit-id "04" :proposal-version -1 :trans-version "20140605" :date "23-Jul-2014 14:40:21.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 4178080 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13831 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13831 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2863 :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 3226 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "04" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2863 :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 3226 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "04" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2863 :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 3226 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "04" :orbit-number 4 :pcs-time 222 :si-vis-utilization 2863 :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 3226 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "04" :orbit-number 5 :pcs-time 222 :si-vis-utilization 2863 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3226 :pcs-gap 0 ) true 5 0 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. /private/var/folders/ql/9t0yvtlx6jj67fltdg94b0_40000gn/T/OPVisit5217101257072519184.xml (Tic-Visit :proposal-id 13831 :visit-id "05" :proposal-version -1 :trans-version "20140605" :date "23-Jul-2014 14:40:25.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 2506848 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13831 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13831 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2863 :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 3241 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "05" :orbit-number 2 :pcs-time 222 :si-vis-utilization 2863 :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 3241 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13831 :visit-id "05" :orbit-number 3 :pcs-time 222 :si-vis-utilization 2863 :al-overhead-at-end 0 :internal-dur-at-end 500 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3241 :pcs-gap 0 ) true 3 0