0Assigned ID: 767
----- Attempting Submission 1 (Fri Apr 07 19:12:07 GMT 2017) -----
HST Phase I Proposal 767 (HST_Cycle25_EMGW.apt) successfully submitted.
Receipt: # 767-1
----- Attempting Submission 2 (Fri Apr 07 20:57:07 GMT 2017) -----
HST Phase I Proposal 767 (HST_Cycle25_EMGW.apt) successfully submitted.
Receipt: # 767-2
----- Attempting Submission 3 (Fri Apr 07 22:42:44 GMT 2017) -----
HST Phase I Proposal 767 (HST_Cycle25_EMGW.apt) successfully submitted.
Receipt: # 767-3
----- Attempting Submission 4 (Fri Apr 07 22:49:18 GMT 2017) -----This target is not used in this proposal.
This pattern is not used in this proposal.
This pattern is not used in this proposal.Please schedule Visit 03 asap (as close to window re-opening as possible).
If we can wait to schedule Visit 04 after seeing Visit 03 data, that would be best. If not, please schedule Visit 04 one month after Visit 03.
--
NOTE: Changed filter to F275W in Visit 02. Thanks. Please schedule before sun constraint on Aug 30.
NOTE: Changed filter to F275W and shortened orbital visibility to 49min.
Please schedule Visit 01 ASAP
Please schedule Visit 02 BEFORE sun constraint on Aug 30
Please ignore Visit 03 and Visit 04 as they don't need to be scheduled for a few months.
8/21/17 - ROYLE - added FLASH to exposures in visits 01 and 02 as requested by Instrument Reviewer1838632541----- Attempting Submission 1 (Thu Jul 20 01:21:26 GMT 2017) -----
----- Attempting Submission 2 (Thu Jul 20 17:05:06 GMT 2017) -----
----- Attempting Submission 3 (Mon Aug 21 17:06:34 GMT 2017) -----
----- Attempting Submission 4 (Mon Aug 21 18:05:17 GMT 2017) -----
----- Attempting Submission 5 (Mon Aug 21 18:25:26 GMT 2017) -----
----- Attempting Submission 6 (Mon Aug 21 20:45:54 GMT 2017) -----
HST Phase II Proposal 15346 (15346.apt) successfully submitted.
Receipt: # 15346-6
----- Attempting Submission 8 (Tue Aug 22 16:34:08 GMT 2017) -----
----- Attempting Submission 9 (Thu Oct 19 17:52:58 GMT 2017) -----
----- Attempting Submission 10 (Thu Oct 19 18:37:07 GMT 2017) -----
HST Phase II Proposal 15346 (15346.apt) successfully submitted.
Receipt: # 15346-10
----- Attempting Submission 11 (Thu Oct 19 18:46:58 GMT 2017) -----Please schedule Visit 03 asap, first week of December if possible.
My cell phone is +1-626-375-3307. Thank you !!Verifying a candidate counterpart to gravitational wavesWith advances in sensitivity of gravitational wave interferometers, the direct detection of neutron star mergers should be imminent. Identification of an electromagnetic counterpart would enable a wealth of astrophysics and answer the long-standing question of whether neutron star mergers are the missing cosmic mines of heavy elements synthesized by the r-process. We will be searching for a fast-fading optical counterpart with the new Zwicky Transient Facility at Palomar Observatory. Here, we propose to use HST/WFC3 to look for infrared emission from a single, most-promising candidate optical counterpart. The infrared emission would serve as a direct diagnostic of the radioactive decay of heavy elements.We request one disruptive ToO with HST/WFC3.
With GROWTH network follow-up of ZTF candidates, we expect to identify a promising candidate (if any) and submit the ToO trigger within 36 hours of the neutron star merger. With HST, we request the first epoch within one week and the second epoch at three weeks (Figure 2). We need two epochs to determine the rate at which the emission fades. Given current models, we expect a non-detection in the second non-disruptive epoch but it would serve as an invaluable reference to subtract any host galaxy light.
Each epoch would comprise one orbit in each of two filters: F606W and F160W. We choose F160W as it is the reddest available infrared filter. We choose F606W as that would be closest to the discovery filter for ZTF. We run the ETC assuming 50 min of integration per orbit given overheads on account of target acquisition and multiple dithers. With F606W, we would reach a depth of 26.8 mag in 1 orbit and with H-band, we would reach a depth of 26.1 mag AB with S/N=10. With this depth, the F606W filter would be sensitive to opacity < 3 cm^2 / gm and neutron star mass > 3 x 10^(-5) Msun (see Figure 2). With this depth, the F160W filter would be sensitive to ejecta mass > 0.0001 Msun and a ejecta velocity > 0.05 c. We emphasize that HST is more sensitive in H-band than a ground-based telescope due to the strong OH airglow one has to look through from the ground. The sky background from space is 6-10 mag darker at H than from a good ground-based site (e.g., Sullivan & Simcoe 2012).
We request long-term status for both Cycles 25 and Cycles 26 for the following reasons: (i) The duration of the third advanced LIGO run is expected to be approximately 9-12 months between Summer 2018 and Spring 2019. This schedule spans both cycles 25 and cycles 26. (ii) The rates of neutron star mergers is uncertain by an order of magnitude. Assuming the realistic rate, we expect one trigger per month out to 150Mpc. Given the challenges in follow-up where we need the sun, moon and weather to co-operate, we conservatively only request one disruptive ToO trigger for our most promising candidate (see trigger criterion in next section).
Our total request is 4 HST orbits.Stellar PhysicsStellar Populations6falsefalsefalsefalsefalsefalseSUPPORTEDSTARTNOJ2000UNIDENTIFIEDINFRARED EMITTEROPTICAL EMITTERThis is a disruptive ToO proposal. We will only trigger on targets that are spatially and temporally coincident with a gravitational wave trigger. Our trigger criterion to identify the most promising counterpart is to utilize all available information to reject common, unrelated classes of transients (e.g., Supernovae, Active Galactic Nuclei, M-dwarf flares). For example: (i) Spectra dissimilar to any known type of transient and/or (ii) Photometric evolution that is so fast and/or so red that it is most consistent with a neutron star merger and/or (iii) Spatially consistent with a nearby host galaxy known to have a distance within LIGO's sensitivity horizon and/or (iv) No past history of variability.Candidate Electromagnetic Counterpart to Gravitational WavesWFC3/IRImagingNoNoF160WWFC3/UVISImagingNoNoF606WWFC3/IRImagingNoNoF160WWFC3/UVISImagingNoNoF606WPOS-TARGDITHER0.173LINE0.112falsefalse81.785423.884WFC3-UVIS-DITHER-BOX1falsePOS-TARGDITHER0.572LINE0.365falsefalse74.653418.528WFC3-IR-DITHER-BOX-MIN2falsePOS-TARGDITHER0.605LINEfalsefalse341.788WFC3-IR-DITHER-LINE-3PT3falsePOS-TARGDITHER0.135LINEfalsefalse346.84WFC3-UVIS-DITHER-LINE-3PT4falsePOS-TARGDITHER0.145LINEfalsefalse246.84WFC3-UVIS-DITHER-LINE5falseThe scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.1503432545000123.050380943091(Tic-Visit
:proposal-id 15346
:visit-id "01"
:proposal-version -1
:trans-version "20170613"
:date "21-Aug-2017 13:45:04.0"
: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 1732496
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15346
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(Tic-Orbit
:proposal-id 15346
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 2881
:al-overhead-at-end 123
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3217
:pcs-gap 0
)true10We request the first epoch within 1 week of merger.The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode.491503964625000125.37308685877667(Tic-Visit
:proposal-id 15346
:visit-id "02"
:proposal-version -1
:trans-version "20170613"
:date "22-Aug-2017 09:32:43.0"
: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 1443744
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:coron NIL
)
(Tic-Obset
:proposal-id 15346
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15346
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2606
:al-overhead-at-end 123
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2940.0
:pcs-gap 0
)true10We request the first epoch within 1 week of merger.The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode./private/var/folders/dv/kllm6qvx1m3bq_0v7lp6wwtc000702/T/OPVisit7198725285288966548.xml(Tic-Visit
:proposal-id 15346
:visit-id "03"
:proposal-version -1
:trans-version "20170613"
:date "19-Oct-2017 14:32:39.0"
: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 557072
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 15346
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 15346
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2640
:al-overhead-at-end 0
:internal-dur-at-end 690
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3217
:pcs-gap 0
)true10The scheduling data was generated by CASM 25.2.CASM was run in Phase II mode./private/var/folders/dv/kllm6qvx1m3bq_0v7lp6wwtc000702/T/OPVisit7532059480920561907.xml(Tic-Visit
:proposal-id 15346
:visit-id "04"
:proposal-version -1
:trans-version "20170613"
:date "19-Oct-2017 14:32:39.0"
: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 557072
:tdrss-contact-duration 0
:coron NIL
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(Tic-Obset
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:pcs-mode "FGS"
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(Tic-Orbit
:proposal-id 15346
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:orbit-number 1
:pcs-time 333
:si-vis-utilization 2640
:al-overhead-at-end 0
:internal-dur-at-end 690
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3217
:pcs-gap 0
)true10would like the data for visit 03 before refining visit 04