Identifying and studying gamma-ray bursts at very high redshifts
Gamma-ray bursts are bright enough to be seen to very high redshifts and their afterglows can provide redshifts and positions of their host galaxies, and in some cases details of the host ISM and the IGM close to the burst. Thus GRBs offer a unique probe of early star formation and the galaxy populations in the era of reionization. Our efforts to identify high-z GRBs were rewarded with the recent discovery of GRB 090423 at redshift 8.2. However, it remains the case that some good candidate high-z GRBs cannot be followed up quickly or deeply enough with ground-based IR spectroscopy, and indeed for others it is likely the Ly-alpha break falls in difficult regions of the IR spectrum. WFC3/IR on HST can obtain redshifts based on the location of the Ly-alpha break via slitless grism spectroscopy, to considerably deeper limits (and hence later times) than is possible from the ground, thus offering a solution to this problem. Our proposal aims to increase the efficiency of locating z>7 GRBs over the next three years by performing such spectroscopy on candidates for which photometry suggests they are very high redshift, but where the redshift can't be secured from the ground. We also propose to monitor the afterglows of any high-z GRBs found, and to perform an initial search for their hosts.
We propose to observe the locations of candidate or confirmed high-z GRBs using ACS/WFC or WFC3/IR. The aims are to i) determine or confirm redshifts via grism spectroscopy, ii) measure the late time lightcurves of the bursts and iii) characterize the nature of the host galaxies. We have therefore defined several observations
1) WFC3 grism spectroscopy. Visits GA-GF specify short exposures in F110W, followed by a 2 point dither observation using G102. The visits themselves will be triggered together and use POS-TARG offsets to recreate a 6-point dither pattern. Visits GG-GL are similar, but for candidate higher redshift events, and utilize F160W for the short astrometric observation, and G140L. The visits are 1 orbit long for scheduling convienience, but will be triggered together.
2) Short exposures for lightcurve monitoring, may be taken at similar times to spectroscopy. This includes 1 orbits (early) and 2 orbit (later) time observations of the afterglows in F105W, F125W and F160W. The preicse filters will be chosen at the time to optimally sample both lightcurve and SED. For bursts at lower-z (e.g. 6<z<7), we have also specified ACS/WFC F814W and F850LP observations.
3) Late time observations to charaterize the nature of the host galaxy, and provide a template for subtraction from early data. These observations will be >4 orbits in duration, and may use either ACS or WFC3 depending on the redshift.
COSMOLOGY
12
false
0.0
0.0
false
false
false
false
SUPPORTED
GALAXY
HIGH REDSHIFT GALAXY
J2000
UNIDENTIFIED
GAMMA RAY EMITTER
Trigger on high-z gRB
UNIDENTIFIED
GAMMA RAY EMITTER
Trigger on high-z GRB
WFC3/IR
Spectroscopic
No
No
G102
WFC3/IR
Spectroscopic
No
No
G102
WFC3/IR
Spectroscopic
No
No
G102
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Spectroscopic
No
No
G102
WFC3/IR
Spectroscopic
No
No
G141
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Imaging
No
No
F140W
POS-TARG
DITHER
0.572
LINE
0.365
false
false
74.653
4
18.528
WFC3-IR-DITHER-BOX-MIN
1
false
POS-TARG
DITHER
DITHER
2
0.572
WFC3-IR-DITHER-LINE
0.365
false
false
74.653
0.636
4
18.528
POS-TARG
BOX
41.788
2
true
POS-TARG
DITHER
0.636
LINE
false
false
2
41.788
WFC3-IR-DITHER-LINE
4
false
POS-TARG
DITHER
0.173
LINE
0.112
false
false
81.785
4
23.884
WFC3-UVIS-DITHER-BOX
7
false
The scheduling data was generated by CASM 20.2.
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true
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true
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Trigger will occur on high-z GRB
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Trigger will occur on high-z GRB
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Trigger will occur on high-z GRB
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Trigger will occur on high-z GRB
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Trigger will occur on high-z GRB
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true
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Trigger will occur on high-z GRB
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true
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Trigger will occur on high-z GRB
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true
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Trigger will occur on high-z GRB
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true
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Trigger will occur on high-z GRB
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true
1
0
Trigger will occur on high-z GRB
The scheduling data was generated by CASM 20.2.
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F125W, 1 orbit, 4 point dither
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true
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0
Awaiting GRB trigger
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true
2
0
Awaiting GRB trigger
The scheduling data was generated by CASM 20.2.
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true
1
0
Awaiting GRB trigger
The scheduling data was generated by CASM 20.2.
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1322824486000
52.90185489951821
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true
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0
The scheduling data was generated by CASM 20.2.
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F140W, 2 orbit, 4 point dither
(Tic-Visit
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:trans-version "20120802"
:date "01-Nov-2012 16:55:21.0"
: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 1236016
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12247
:visit-id "F2"
:obset-id "F2"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "F2"
: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 3239
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "F2"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3000
:al-overhead-at-end 0
:internal-dur-at-end 443
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3239
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
F606W, 2 orbit, 4 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "F6"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:56:56.0"
:trans-errors '(:WARNINGS 2 :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 12247
:visit-id "F6"
:obset-id "F6"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "F6"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2912
:al-overhead-at-end 116
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3239
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "F6"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3022
: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 3239
:pcs-gap 0
)
true
2
2
Awaiting outcome of visit F1
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
F775W, 2 orbit, 4 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "F7"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:56:57.0"
:trans-errors '(:WARNINGS 2 :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 12247
:visit-id "F7"
:obset-id "F7"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "F7"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2912
:al-overhead-at-end 116
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3239
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "F7"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3022
: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 3239
:pcs-gap 0
)
true
2
2
Awaiting outcome of visit F1
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
F105W, 1 orbit, 4 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "Y1"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:56:58.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "30"
:si-bright-earth-limb-angle 20.0
:data-volume 1044528
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12247
:visit-id "Y1"
:obset-id "Y1"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y1"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2840
:al-overhead-at-end 0
:internal-dur-at-end 519
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)
true
1
0
Awaiting GRB trigger
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
F105W, 2 orbit, 4 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "Y2"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:57:14.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "30"
:si-bright-earth-limb-angle 20.0
:data-volume 1236016
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12247
:visit-id "Y2"
:obset-id "Y2"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y2"
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y2"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3000
:al-overhead-at-end 0
:internal-dur-at-end 443
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)
true
2
0
Awaiting GRB trigger
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
4 orbit F105W, 8 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "Y3"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:57:16.0"
: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 2089040
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12247
:visit-id "Y3"
:obset-id "Y3"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y3"
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y3"
:orbit-number 2
:pcs-time 222
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y3"
:orbit-number 3
:pcs-time 222
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "Y3"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 310
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)
true
4
0
Awaiting high-z GRB trigger
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
4 orbit F125W, 8 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "J3"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:57:18.0"
: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 2089040
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12247
:visit-id "J3"
:obset-id "J3"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "J3"
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "J3"
:orbit-number 2
:pcs-time 222
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "J3"
:orbit-number 3
:pcs-time 222
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "J3"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 310
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)
true
4
0
Awaiting high-z GRB trigger
The scheduling data was generated by CASM 20.2.
CASM was run in Phase II mode.
4 orbit F160W, 8 point dither
(Tic-Visit
:proposal-id 12247
:visit-id "H3"
:proposal-version -1
:trans-version "20120802"
:date "01-Nov-2012 16:57:20.0"
: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 2089040
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 12247
:visit-id "H3"
:obset-id "H3"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 12247
:visit-id "H3"
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "H3"
:orbit-number 2
:pcs-time 222
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "H3"
:orbit-number 3
:pcs-time 222
: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 3229
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 12247
:visit-id "H3"
:orbit-number 4
:pcs-time 222
:si-vis-utilization 2710
:al-overhead-at-end 0
:internal-dur-at-end 310
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3229
:pcs-gap 0
)
true
4
0
Awaiting high-z GRB trigger