0Assigned ID: 401
----- Attempting Submission 1 (Fri Apr 08 06:37:53 GMT 2016) -----I was unable to fill in all of the orbit time with the suggested optional parameters for faint targets, often leaving a few min per orbit unused. I'm not sure if there is a way around this, without compromising S/N.
I was unsure about my calculation of the proper ORIENT angles to avoid bleeding from nearby stars. A double-check on this would be great!-440276576----- Attempting Submission 1 (Thu Jul 21 18:12:28 GMT 2016) -----Underlying Hosts or Highly-Kicked? Determining the Nature of Host-less Short Gamma-ray Bursts with HSTStudies of the environments of short-duration gamma-ray bursts (GRBs) from sub-kpc to galactic scales have provided several lines of indirect observational evidence that short GRBs originate from the mergers of compact object binaries (neutron stars and/or black holes; NS-NS/NS-BH). A fundamental prediction of NS-NS/NS-BH mergers is natal kicks imparted to the systems; thus the locations of short GRBs with respect to their hosts have served as the most crucial diagnostic in solving the progenitor question. One key result that has emerged from these studies is the discovery of a subset of short GRBs which lack coincident galaxies to deep optical and near-IR limits (termed "host-less" bursts). These events either originate from faint underlying low-luminosity or high redshift hosts, or originate from galaxies at large separations of tens to hundreds of kpc (indicative of large kicks). Here, we propose to use HST to obtain deep imaging of six "host-less" short GRBs which have deep ground-based optical limits of >25-26 mag, necessitating the sensitivity of HST. These observations will uncover or place meaningful limits on coincident hosts, providing vital constraints on the true spatial distribution of short GRBs, the fraction of highly-kicked mergers which occur far from their hosts, and will directly inform population synthesis models of compact object mergers, which at present rely on poorly-constrained distributions of kick velocities and delay times. Our proposed WFC3/F110W observations will double the sample of host-less bursts, and are tailored to locate or rule out underlying hosts to a significantly greater depth and redshift than is possible from the ground.This program is designed to observe the locations of 6 short-duration gamma-ray bursts (GRBs) to search for a faint (>25 AB mag) host galaxy, or place deep limits on a spatially coincident host galaxy. We utilize the WFC3/IR camera and F110W filter to be sensitive to a wide redshift range of galaxies and provide significantly improved sensitivity upon the existing ground-based observations.
This program requires 6 visits, or 1 visit per GRB. For each visit, we utilize a 4-point dither pattern (WFC3-IR-DITHER-BOX-MIN) and read-out mode SAMP-SEQ=SPARS100. For Visit 01 (GRB 091109B), the number of samples is NSAMP=15. The remaining visits (Visit 02-06) have a number of samples NSAMP=14, as a higher number overruns the orbit visibility. Thus, Visit 01 has a total exposure time of 4x1403sec = 5612sec, while Visits 02-06 have total exposure times of 4x1303sec = 5212sec each. Including target acquisition and overheads, each visit is 2 orbits long. Thus, this program uses the allocated 12 orbits in total.
For some of our targets, there are one or more bright sources within 12 arcseconds of the GRB position that may create diffraction spikes which contaminate the target position. This applies to Visits 01, 04, and 06. Thus, we provide several ranges of allowed orientation angles for each target to avoid diffraction spike contamination in the the visit orientation requirements.Stellar PhysicsStellar Populations12falsefalsefalsefalsefalsefalseSUPPORTEDGALAXYUNDESIGNATEDJ2000J2000GALAXYUNDESIGNATEDJ2000J2000GALAXYUNDESIGNATEDJ2000J2000GALAXYUNDESIGNATEDJ2000J2000GALAXYUNDESIGNATEDJ2000J2000GALAXYUNDESIGNATEDJ2000J2000WFC3/IRImagingNoNoF110WWFC3/IRImagingNoNoF110WWFC3/IRImagingNoNoF110WWFC3/IRImagingNoNoF110WWFC3/IRImagingNoNoF110WWFC3/IRImagingNoNoF110WPOS-TARGDITHER0.572LINE0.365falsefalse74.653418.528WFC3-IR-DITHER-BOX-MIN1false/Users/wenfai/Desktop/HST budget materials/OP-cache/fong_phase2_v1-v01.xmlThe scheduling data was generated by CASM 24.2.CASM was run in Phase II mode.The target of interest is 8" away from a bright 15th mag star. Thus we set the orientation to avoid bleeding from this star that affects the target position. The PA between the target and star is 319 deg. The selected axis is 45 deg from the Y-axis (since diffraction spikes are 45 deg offset from the X- and Y-axes for WFC3). Employing an offset angle of 135 deg, we calculate angles to avoid of ORIENT = 319(PA) + 135(offset angle for y-axis) + 45(offset from y-axis) - 360 = 139 deg. We also calculate angles 90, 180, and 270 deg offset from this angle to avoid all 4 diffraction spikes - 49 deg, 229 deg, 319 deg. We set ORIENT angles to avoid this, +/- 15 deg about each angle: ORIENT = 0-34, 64-124, 154-214, 244-304, 334-359 deg.
*Note: We would greatly appreciate that this part is checked over since we are not sure if this is correct, particularly the addition of the 45 deg offset.*(Tic-Visit
:proposal-id 14685
:visit-id "01"
:proposal-version -1
:trans-version "20160601"
:date "21-Jul-2016 10:47:14.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "30"
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:data-volume 1114160
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14685
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14685
:visit-id "01"
:orbit-number 1
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:dark-offset NIL
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:low-sky "N"
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)
(Tic-Orbit
:proposal-id 14685
:visit-id "01"
:orbit-number 2
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:internal-dur-at-end 272
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3403
:pcs-gap 0
)true20/Users/wenfai/Desktop/HST budget materials/OP-cache/fong_phase2_v1-v02.xmlThe scheduling data was generated by CASM 24.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14685
:visit-id "02"
:proposal-version -1
:trans-version "20160601"
:date "19-Jul-2016 16:17:50.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "30"
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:data-volume 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14685
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14685
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 0
:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
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)
(Tic-Orbit
:proposal-id 14685
:visit-id "02"
:orbit-number 2
:pcs-time 222
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:al-overhead-at-end 0
:internal-dur-at-end 234
:dark-offset NIL
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:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)true20/Users/wenfai/Desktop/HST budget materials/OP-cache/fong_phase2_v1-v03.xmlThe scheduling data was generated by CASM 24.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14685
:visit-id "03"
:proposal-version -1
:trans-version "20160601"
:date "19-Jul-2016 15:22:30.0"
: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 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14685
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14685
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2710
: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 3218
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14685
:visit-id "03"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 234
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3218
:pcs-gap 0
)true20/Users/wenfai/Desktop/HST budget materials/OP-cache/fong_phase2_v1-v04.xmlThe scheduling data was generated by CASM 24.2.CASM was run in Phase II mode.We set the orientation to avoid bleeding from two nearby stars. The PA between the target and stars are 250 and 260 deg, respectively. The selected axis is 45 deg from the Y-axis (since diffraction spikes are 45 deg offset from the X- and Y-axes for WFC3). Employing an offset angle of 135 deg, we calculate angles to avoid of ORIENT = 250 to 260(PA) + 135(offset angle for y-axis) + 45(offset from y-axis) - 360 = 70-80 deg. We also calculate angles 90, 180, and 270 deg offset from this angle to avoid all 4 diffraction spikes: 160-170, 250-260, and 340-350 deg. We set ORIENT angles to avoid this, +/- 15 deg about each angle: ORIENT = 5-55, 95-145, 185-235, and 275-325 deg.
*Note: We would greatly appreciate that this part is checked over since we are not sure if this is correct, particularly the addition of the 45 deg offset.*(Tic-Visit
:proposal-id 14685
:visit-id "04"
:proposal-version -1
:trans-version "20160601"
:date "21-Jul-2016 10:32:24.0"
: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 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14685
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
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(Tic-Orbit
:proposal-id 14685
:visit-id "04"
:orbit-number 1
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:internal-dur-at-end 0
:dark-offset NIL
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:low-sky "N"
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(Tic-Orbit
:proposal-id 14685
:visit-id "04"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 234
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3210
:pcs-gap 0
)true20/Users/wenfai/Desktop/HST budget materials/OP-cache/fong_phase2_v1-v05.xmlThe scheduling data was generated by CASM 24.2.CASM was run in Phase II mode.(Tic-Visit
:proposal-id 14685
:visit-id "05"
:proposal-version -1
:trans-version "20160601"
:date "19-Jul-2016 13:18:11.0"
: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 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14685
:visit-id "05"
:obset-id "05"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14685
:visit-id "05"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2710
: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 3218
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14685
:visit-id "05"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 234
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3218
:pcs-gap 0
)true20/Users/wenfai/Desktop/HST budget materials/OP-cache/fong_phase2_v1-v06.xmlThe scheduling data was generated by CASM 24.2.CASM was run in Phase II mode.There is a star with J=16.7 mag (from 2MASS) 11" from the target position. We set the orientation to avoid bleeding from this nearby star. The PA between the target and star is 15 deg. The selected axis is 45 deg from the Y-axis (since diffraction spikes are 45 deg offset from the X- and Y-axes for WFC3). Employing an offset angle of 135 deg, we calculate angles to avoid of ORIENT = 15(PA) + 135(offset angle for y-axis) + 45(offset from y-axis) = 195 deg. We also calculate angles 15, 105, and 285 deg to avoid all 4 diffraction spikes. We set ORIENT angles to avoid this, +/- 15 deg about each angle: ORIENT = 30-90, 120-180, 210-270, 300-360 deg.
*Note: We would greatly appreciate that this part is checked over since we are not sure if this is correct, particularly the addition of the 45 deg offset.*(Tic-Visit
:proposal-id 14685
:visit-id "06"
:proposal-version -1
:trans-version "20160601"
:date "21-Jul-2016 11:02:25.0"
: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 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 14685
:visit-id "06"
:obset-id "06"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 14685
:visit-id "06"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2710
: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 3222
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 14685
:visit-id "06"
:orbit-number 2
:pcs-time 222
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:al-overhead-at-end 0
:internal-dur-at-end 234
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3222
:pcs-gap 0
)true20