in viist 4
I increased the exposure time in the COS acq to 90 seconds/exposure.
and decreased the first COS exposure from 2000 to 1900 seconds.----- Attempting Submission 6 (Thu Apr 22 19:56:41 GMT 2010) -----UV Studies of a Core Collapse SupernovaObservations of the UV spectrum of core collapse SNe hold unique
information about nucleosynthesis, the mass loss history, shock
physics and dust formation in the explosion on massive stars.
This proposal aims at a detailed study of a bright core collapse SN,
discovered by any of the many ongoing surveys, either a Type IIP, IIn or Ibc supernova.
We will address the role of circumstellar interaction and mass loss through
CNO lines in the UV, the nature of dust formation from UV line
profiles and use the UV continuum as a diagnostic of non-thermal
emission from the shock. The overall goal of our team is
to achieve a better understanding of these objects by combining
HST data with complementary ground-based observations.
We have used HST to obtain UV spectra from the explosion to
the nebular phase. Over the past decade, we have conducted studies
of nearby SNe with HST, and we have published an extensive
series of papers. When Nature provides a bright candidate, HST should be
ready to respond.For a type Ib/Ic SNE, we'll use visits 1,2,3,4
Here is the next version of the proposal:
first: here is the sn1998S spectrum from 1100-8200A
this supernova , type IIn, was taken at 13 days after explosion.
http://www.cfa.harvard.edu/~pchallis/sn1998S.dat
I'm using it as a model/input for STIS and COS ETCs
for acqusitions and exposure times. Also for brightness limit
checks.
There are various observing strategies in this programs.
and I'll try to clarify them here.
(I'll also add this to the observing description in the proposal).
A) For a supernova without the far UV flux, but maybe bright
in near UV and optical, we'll use visits 1,2,3,4 which only
use the STIS/CCD. The acqusition time is 1 second for a 14th mag
object using STIS/CCD MIRROR+F28X50LP
if acceptable, please authorize visits 1,2,3,4
B) For a supernova, like sn1998S, with unknown UV flux, maybe the best
and safest plan is to make an observation with the STIS/CCD/G230LB.
Measure the UV flux. Use the measured UV flux, to estimate
the countrate in the Far UV (down to 1000A).
sn1998S was done at phase +13 days, but at earlier phases
we expect the UV to be even higher.
then, ask for another ToO to trigger a sequence of visits.
visit 99 is a single 2 orbit visit using STIS/CCD/G230LB and STIS/CCD/G430L
and is not linked to any other visit.
if acceptable, please authorize visit 99
then, planning ahead we can prepare a sequence of visits
that takes advantage of COS or STIS.
Sequence #1 (using COS with Medium gratings (if we we signd of
interstellar interaction))
visits
10,11 for 1998S like, B =14th mag
visit 10: 1 orbit
COS/NUV ACQ/SEARCH/PSA 5 seconds 2x2
COS/NOV ACS/IMAGE/PSA 5 seconds
COS/FUV G130M TIME-TAG 900 seconds buffer-time=1000,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
COS/FUV G160M TIME-TAG 900 seconds buffer-time=1000,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
visit 11: 1 orbit linked to visit 10
STIS/CCD ACQ MIRROR F28X50LP 1 second.
STIS/CCD G230LB 1700 seconds cr-split=2
STIT/CCD G430L 180 seconds cr-split=no
12,13 AFTER visit 10 by 7 to 14 days
visit 11: 2 orbits
COS/NUV ACQ/SEARCH/PSA 5 seconds 2x2
COS/NOV ACS/IMAGE/PSA 5 seconds
COS/FUV G130M TIME-TAG 2050 seconds buffer-time=2050,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
COS/FUV G160M TIME-TAG 2700 seconds buffer-time=3100,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
visit 13: 1 orbit linked to visit 11
STIS/CCD ACQ MIRROR F28X50LP 1 second.
STIS/MAMA G230L 1700 seconds
STIT/CCD G430L 180 seconds cr-split=no
14,15 AFTER visit 10 by 30 to 60 days
visit 14: 2 orbits
COS/NUV ACQ/SEARCH/PSA 5 seconds 2x2 - ACQ time will have to be recalculated based on the light curve
COS/NOV ACS/IMAGE/PSA 5 seconds
COS/FUV G130M TIME-TAG 2050 seconds buffer-time=2050,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
COS/FUV G160M TIME-TAG 2700 seconds buffer-time=3100,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
visit 15: 1 orbit linked to visit 14
STIS/CCD ACQ MIRROR F28X50LP 1 second. ACQ time will have to be recalculated based on the light curve
STIS/MAMA G230L 1700 seconds
STIT/CCD G430L 180 seconds cr-split=no
Sequence #2 (using COS with G140L and B = 15th mag.. too faint for COS medium disperson)
visit 20,21
visit 20: 1 orbit
COS/NUV ACQ/SEARCH/PSA 12 seconds 2x2
COS/NOV ACS/IMAGE/PSA 12 seconds
COS/FUV G140L TIME-TAG 2100 seconds buffer-time=2400,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
visit 21: 1 orbit linked to visit 20
STIS/CCD ACQ MIRROR F28X50LP 1 second.
STIS/MAMA G230L 1700 seconds
STIT/CCD G430L 180 seconds cr-split=no
visit 22,23 AFTER 20 by 7 to 14 days
visit 22: 2 orbits
COS/NUV ACQ/SEARCH/PSA 12 seconds 2x2
COS/NOV ACS/IMAGE/PSA 12 seconds
COS/FUV G140L TIME-TAG 2100 seconds buffer-time=3000,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
COS/FUV G140L TIME-TAG 2600 seconds buffer-time=3000,FP-POS=2,SEGMENT=both,exteneded=no,FLASH=yes
visit 23: 1 orbit linked to visit 22
STIS/CCD ACQ MIRROR F28X50LP 1 second.
STIS/MAMA G230L 1700 seconds
STIT/CCD G430L 180 seconds cr-split=no
visit 24,25 AFTER 20 by 30 to 60 days
visit 24: 2 orbits
COS/NUV ACQ/SEARCH/PSA 12 seconds 2x2 - exposure time will have to be recalculated
COS/NOV ACS/IMAGE/PSA 12 seconds - exposure time will have to be recalculated
COS/FUV G140L TIME-TAG 2100 seconds buffer-time=3000,FP-POS=1,SEGMENT=both,exteneded=no,FLASH=yes
COS/FUV G140L TIME-TAG 2600 seconds buffer-time=3000,FP-POS=2,SEGMENT=both,exteneded=no,FLASH=yes
visit 25: 1 orbit linked to visit 24
STIS/CCD ACQ MIRROR F28X50LP 1 second.
STIS/MAMA G230L 1700 seconds
STIT/CCD G430L 180 seconds cr-split=no
then,
visits 30,31,32 are just like visits 2,3,4
STIS/CCD only (but only 3 visits long)HOT STARS12false0.00.0falsefalsefalsefalsefalsefalseSUPPORTEDEXT-STARSUPERNOVASUPERNOVA TYPE IIJ200000 00 0.0000+00 00 0.00J2000COS/FUVSpectroscopicNoNoG130M1300COS/FUVSpectroscopicNoNoG160M1600COS/FUVSpectroscopicNoNoG140L1230STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/CCDSpectroscopicNoNoG230LB2375STIS/CCDSpectroscopicNoNoG430L4300Timing link suitability includes constraints ([02 After 01 by 7.0 to 12.0 days] [03 After 01 by 20.0 to 40.0 days] [04 After 01 by 120.0 to 250.0 days])The scheduling data was generated by CASM 18.1.CASM was run in Phase II mode.The Visit only uses the STIS/CCD.1269779585000102.11436503754891(Tic-Visit
:proposal-id 11654
:visit-id "01"
:proposal-version -1
:trans-version "20091209"
:date "20-Mar-2010 11:51:07.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 166048
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11654
:visit-id "01"
:obset-id "01"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11654
:visit-id "01"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2642
: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 3021
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11654
:visit-id "01"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2768
:al-overhead-at-end 0
:internal-dur-at-end 381
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3021
:pcs-gap 0
)false20On hold for Target-of-opportunityTiming link suitability includes constraints ([02 After 01 by 7.0 to 12.0 days])The scheduling data was generated by CASM 18.1.CASM was run in Phase II mode.This visits used the STIS/MAMA . Using the STIS ETC see exposure A290509.
this used sn1998S @ day 13 after explosion (very similiar object to sn2010al).
this is a good upper limit. The expected flux will be lower because visit
2 will be executed at a phase of ~25 days after explosion. we don't expect
any bright emission features.1270659567000102.37608537882238(Tic-Visit
:proposal-id 11654
:visit-id "02"
:proposal-version -1
:trans-version "20091209"
:date "22-Mar-2010 15:25:46.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 270480
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11654
:visit-id "02"
:obset-id "02"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11654
:visit-id "02"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2642
: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 3021
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11654
:visit-id "02"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2768
: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 3021
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11654
:visit-id "02"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 2428
:al-overhead-at-end 200
:internal-dur-at-end 321
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3021
:pcs-gap 0
)false30On hold for Target-of-opportunityTiming link suitability includes constraints ([Sequence (03 04) within 2.0 days])The scheduling data was generated by CASM 18.1.CASM was run in Phase II mode.please try to schedule before the super
BEFORE date of 01-Jun-2010 is preferred but can be relaxed to as late as 01-JUL-2010 if necessary.(Tic-Visit
:proposal-id 11654
:visit-id "03"
:proposal-version -1
:trans-version "20100218"
:date "19-Apr-2010 17:30:19.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 368480
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11654
:visit-id "03"
:obset-id "03"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11654
:visit-id "03"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2891
: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 3249
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11654
:visit-id "03"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 2989
: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 3249
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11654
:visit-id "03"
:orbit-number 3
:pcs-time 222
:si-vis-utilization 3001
:al-overhead-at-end 0
:internal-dur-at-end 557
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3249
:pcs-gap 0
)false30Timing link suitability includes constraints ([Sequence (03 04) within 2.0 days])The scheduling data was generated by CASM 18.1.CASM was run in Phase II mode./tmp/OPVisit38366.xmlI used our HST/STIS UV spectrum from April 7th as input for the
COS/ETC. The ETC using MIRROR A/PSA says 28 seconds for s/n 40.
For this visit, the supernova will fade about 0.7 mags in 1 month,
which is about a factor of 2 in flux. I took the HST spectrum, divided by
2 and the ETC says 60 seconds for the acqusition exposure time.
ASCII spectra can be downloaded here:
http://www.cfa.harvard.edu/~pchallis/sn2010ale2_dividedby2.dat
The FAR UV spectrum is an emission spectrum. The counts/sec at these
lines is very far below the count limits of COS. we expect a s/n ~10-20 in the
emission features.(Tic-Visit
:proposal-id 11654
:visit-id "04"
:proposal-version -1
:trans-version "20100218"
:date "22-Apr-2010 15:53:53.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 87328
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 11654
:visit-id "04"
:obset-id "04"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 11654
:visit-id "04"
:orbit-number 1
:pcs-time 333
:si-vis-utilization 2907
:al-overhead-at-end 0
:internal-dur-at-end 192
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3249
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 11654
:visit-id "04"
:orbit-number 2
:pcs-time 222
:si-vis-utilization 3014
:al-overhead-at-end 0
:internal-dur-at-end 504
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3249
:pcs-gap 0
)true20I added FP-POS=2 to shift in the disersion diretion, which will
help remove the fixed pattern noise.