Resubmitting with correction to G230L ETC calculations requested by STIS instrument reviewer.
No changes in exposure times or other observational parameters; only changes are in the ETC #'s and the comments to exposure 2S.002.1505374752----- Attempting Submission 1 (Thu Jul 29 20:36:56 GMT 2021) -----
----- Attempting Submission 2 (Mon Oct 25 20:03:42 GMT 2021) -----ULLYSES T Tauri Survey Star WZ Cha in Cha IThe Space Telescope Science Institute (STScI) Director has decided to devote up to 1000 orbits of Director's Discretionary time in observing Cycles 27-29 to a new Hubble Ultraviolet Legacy program focused on star formation and associated stellar physics. This new program, ULLYSES (UV Legacy Library of Young Stars as Essential Standards), will provide a UV spectroscopic reference sample of young (< 10 Myr) high- and low-mass stars. It will target over ~150 OB stars in the Magellanic Clouds and lower metallicity galaxies in the Local Group, and ~40 T Tauri stars and brown dwarfs in the Milky Way. In addition, ULLYSES will monitor 4 typical T Tauri stars over different rotational phases through at least three rotation periods, and over timescales of months to years. The resulting library will provide template spectra of massive stars at metallicities substantially below the well studied, while the low mass sample will cover a wide range of ages, accretion rates, and masses, including objects down to well below 0.5 M_sun. The legacy of this large UV dataset on the first 10 Myr of stellar evolution will be enhanced by complementary datasets obtained by the scientific community. In addition to the core goals of the program related to stellar astrophysics of low and high mass stars, this data will also enable exciting science in the fields of ISM, CGM, jets, and exoplanets. ULLYSES will be modeled after the Frontier Fields program: all data obtained will be non-proprietary. The implementation team at STScI is developing high-level science data products and a sophisticated database and website for disseminating data from the ULLYSES program and ancillary datasets for the ULLYSES target sample from space and ground-based facilities.This proposal includes a subset of the low mass ULLYSES survey stars. Each target will be observed with the COS c1291 + c1589 + c1623 settings, as well as with STIS G230L, G430L, and G750L. All observations will normally be constrained to occur within 1 day.
Signal-to-noise requirements used to determine the desired exposures times were defined as follows:
COS/G130M/c1291: N V 1239 +- 1 A -- S/N=10/6-pix-resel at the peak of the line
COS/G160M/c1589: C IV 1549 +- 1 A -- S/N=20/6-pix-resel at the peak of the line (combined c1589 & c1623)
COS/G160M/c1623: C IV 1549 +- 1 A -- S/N=20/6-pix-resel at the peak of the line (combined c1589 & c1623)
STIS/G230L/52X2: Mg II 2800 +-15 A -- S/N=20/2-pix-resel at the peak of the line
STIS/G430L/52X2: continuum average 4000 +-5 A -- S/N=20/2-pix-resel (2 reads)
STIS/G750L/52X2: continuum average 5700 +-5 A -- S/N=20/2-pix-resel (2 reads)
Additional details about the scientific motivation and technical implementation strategy of the ULLYSES observations can be found at http://www.stsci.edu/stsci-research/research-topics-and-programs/ullyses. The ULLYSES program is based on the recommendations of a working group led by Sally Oey; the full text of that group's report can be found at http://www.stsci.edu/files/live/sites/www/files/home/stsci-research/research-topics-and-programs/ullyses/_documents/HSTUV-report-ULLYSES.pdf.0falseSUPPORTEDSTART TAURI STARPRE-MAIN SEQUENCE STARNOV-WZ-Cha : T48, J11105333-7634319
Region: Cha I
Simbad: https://simbad.u-strasbg.fr/simbad/sim-id?Ident=WZ+Cha&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
Target coordinates are from Gaia eDR3.
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
Input file: targets_up_to_May30-2022.csv
t48_lya2_etc_scaled_pAV0.50.txt
Calculation performed 2021-06-18T15:05:22, 0.24
-------------------------------------------------------------------------------
tstatus; V-WZ-CHA; P/COS ready for internal review; S/STIS ready for internal review; P/CP 13/07/21; S/CP 13/07/21
tcheck; APT/SIMBAD target names: ; HBC 585, Sz 38, [FL2004] 74, Ass Cha T 2-48
tcheck; Target info verification status?; SIMBAD calls target M4 rather than M3, but not doubt as to target ID
tcheck; Coordinates & P.M. verified, epoch checked?; Coordinates supplied are actually Gaia EDR3 and are epoch 2016 not 2015.5.
tcheck; Adopted SED compared to Observations?; Yes....
The nominal scaling (without the extra 0.5 mags of Av) gives a very good fit to u band, galex FUV and galex NUV data, (See /box/ullyses_tech/ullyses_proposals/survey_c29/16598/wzcha/wzcha-vs-default.png), so this should be used instead of the fainter alternative. However, in optical the target is much fainter than any of the scaled models. Manara 2017 x-shooter spectra show strong emission lines and strong emission in the Balmer continuum.T48J11105333-7634319J2000SpT=M3; A_V=1.20; U=15.6; V=15.5; B=16.41; I=13.07; G=14.27; galex,fuv=19.393; galex,nuv=17.677; uvgriz,skymapper=15.1, 15.15.84, 15.53, 14.58, 13.56, 12.95Timing link suitability includes constraints ([Group (2C 2D 2S) Within 1.0 days])The scheduling data was generated by CASM 29.2.CASM was run in Phase II mode.vstatus; 2C; V-WZ-CHA; P/COS Approved for Submission; P/CRP 15/07/21 ; intrev: complete ; P/WF 29/07/21
vcheck; Enter targ name & Inst. & Resp. Sci.; V-WZ-CHA ; COS ; CRP
vcheck; ETC numbers entered in APT?; Yes
vcheck; Any screening violations?; no
vcheck; M-dwarf check complete and added to box folder?; yes ...
Most definitive Av is from Manara et al 2017 which gives Av=1.2. No other estimate in vizier is lower than +0.3. But even Av=0.15 is enough to make this target safe! see wzcha_bopscreening.xls and associated spectra. Note that since U band is dominated by the accretion flux, we instead normalize to V and derive the photospheric U from the spectral type to get these results.
vcheck; S/N ETC calcs done & documented?; yes
t48_lya2_etc_scaled_pAV0.50.txt much fainter than observed u band and galex fluxes.
But t48_lya2_etc.txt aggrees well, so redo S/N calcs with those numbers.
(See /box/ullyses_tech/ullyses_proposals/survey_c29/16598/wzcha/wzcha-vs-default.png)
COS.sp.1522996 t48_lya2_etc.txt G160M=1243s S/N=20 at 1548.42
COS.sp.1522992 t48_lya2_etc.txt G130M=2270s S/N=10 at 1238.93
To compromise between this and original 12 orbits, do 6 orbits of COS.
Gets G130M total=7696s, G160M total = 4888s between all CENWAVE/FPPOS
vcheck; Field images checked & saved?; wzcha-cos-galex.png
vcheck; Selected ACQ strategy?; Dispersed G230L, based on t48_lya2_etc.txt, but double exposure time
vcheck; Possible ACQ or Sci spoilers?; non
vcheck; Field BOT clear?; Yes
vcheck; Visual BOT check for stars not in catalog?; clear
vcheck; Orbit packing finalized?; yes - deliberately swapped c1291 FP-POS order in 2D to allow both FP-POS in each visit, but with equal total exposure times.
vcheck; Buffer times optimized?; yes, set all COS buffer times to exptime-110s since cost is minimal
vcheck; Verify visit grouping correct; group 2C, 2D, 2S within 1 day
vcheck; phase constraint for ground based observations added?; N/A
vcheck; BETWEENS for coordinated observations added?; BETWEEN 24 Jan 2022 and 14 May 2022
vcheck; Is visit ready for int. review?; Yes
Allocated COS orbits = 12, but only use 6(Tic-Visit
:proposal-id 16598
:visit-id "2C"
:proposal-version -1
:trans-version "20210514"
:date "29-Jul-2021 15:01:12.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 348096
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16598
:visit-id "2C"
:obset-id "2C"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2C"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2615
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2C"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2616
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2C"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2615
:al-overhead-at-end 0
:internal-dur-at-end 334
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)true30COS.sa.152299 x 2 assuming t48_lya2_etc.txtCOS.sa.1522998 x2 assuming t48_lya2_etc.txtt48_lya2_etc_scaled_pAV0.50.txt much fainter than observed u band and galex fluxes.
But t48_lya2_etc.txt aggrees well, so redo S/N calcs with those numbers.
COS.sp.1522996 t48_lya2_etc.txt G160M=1243s 1548.42
COS.sp.1524224 t48_lya2_x4.00_etc.txt G130M1291 buffer=7856s, bp=0.090 (lya)
t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g130m,c1291,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=11510.8 s, spectral region:
1239.0 +- 1.0 A achieves SNR=10.0 / 6-pix-resel
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 282.2 cts/s/segment
brightest pixel: 0.001 cts/s/pix at 1304.9 A
Calculation performed 2021-06-18T15:05:22, v0.24t48_lya2_etc_scaled_pAV0.50.txt much fainter than observed u band and galex fluxes.
But t48_lya2_etc.txt aggrees well, so redo S/N calcs with those numbers.
COS.sp.1522996 t48_lya2_etc.txt G160M=1243s 1548.42
COS.sp.1524224 t48_lya2_x4.00_etc.txt G130M1291 buffer=7856s, bp=0.090 (lya)
t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g130m,c1291,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=11510.8 s, spectral region:
1239.0 +- 1.0 A achieves SNR=10.0 / 6-pix-resel
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 282.2 cts/s/segment
brightest pixel: 0.001 cts/s/pix at 1304.9 A
Calculation performed 2021-06-18T15:05:22, v0.24t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g160m,c1589,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=2034.8 s, spectral region:
1549.0 +- 1.0 A achieves SNR=20.0 / 6-pix-resel for combined c1589 & c1623
The exptime for this c1589 exposure has been halved because c1589 & c1623 target the same line.
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 66.0 cts/s/segment
brightest pixel: 0.002 cts/s/pix at 1548.4 A
Calculation performed 2021-06-18T15:05:18, v0.24t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g160m,c1589,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=2034.8 s, spectral region:
1549.0 +- 1.0 A achieves SNR=20.0 / 6-pix-resel for combined c1589 & c1623
The exptime for this c1589 exposure has been halved because c1589 & c1623 target the same line.
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 66.0 cts/s/segment
brightest pixel: 0.002 cts/s/pix at 1548.4 A
Calculation performed 2021-06-18T15:05:18, v0.24Timing link suitability includes constraints ([Group (2C 2D 2S) Within 1.0 days])The scheduling data was generated by CASM 29.2.CASM was run in Phase II mode.vstatus; 2D; V-WZ-CHA; P/COS Approved for Submission; P/CRP 15/07/21 ; intrev: complete ; P/WF 29/07/21
vcheck; Enter targ name & Inst. & Resp. Sci.; V-WZ-CHA ; COS ; CRP
vcheck; ETC numbers entered in APT?; Yes
vcheck; Any screening violations?; no
vcheck; M-dwarf check complete and added to box folder?; yes ...
Most definitive Av is from Manara et al 2017 which gives Av=1.2. No other estimate in vizier is lower than +0.3. But even Av=0.15 is enough to make this target safe! see wzcha_bopscreening.xls and associated spectra. Note that since U band is dominated by the accretion flux, we instead normalize to V and derive the photospheric U from the spectral type.
vcheck; S/N ETC calcs done & documented?; yes
t48_lya2_etc_scaled_pAV0.50.txt much fainter than observed u band and galex fluxes.
But t48_lya2_etc.txt agrees well, so redo S/N calcs with those numbers.
(See /box/ullyses_tech/ullyses_proposals/survey_c29/16598/wzcha/wzcha-vs-default.png)
COS.sp.1522996 t48_lya2_etc.txt G160M=1243s S/N=20 at 1548.42
COS.sp.1522992 t48_lya2_etc.txt G130M=2270s S/N=10 at 1238.93
To compromise between this and original 12 orbits, do 6 orbits of COS.
Gets G130M total=7696s, G160M total = 4888s between all CENWAVE/FPPOS
vcheck; Field images checked & saved?; wzcha-cos-galex.png
vcheck; Selected ACQ strategy?; Dispersed G230L 2950, based on t48_lya2_etc.txt, but double exposure time
vcheck; Possible ACQ or Sci spoilers?; none
vcheck; Field BOT clear?; Yes
vcheck; Visual BOT check for stars not in catalog?; clear
vcheck; Orbit packing finalized?; yes - deliberately swapped c1291 FP-POS order in 2D to allow both FP-POS in each visit, but with equal total exposure times.
vcheck; Buffer times optimized?; yes, set all COS buffer times to exptime-110s since cost is minimal
vcheck; Verify visit grouping correct; group 2C, 2D, 2S within 1 day
vcheck; phase constraint for ground based observations added?; N/A
vcheck; BETWEENS for coordinated observations added?; BETWEEN 24 Jan 2022 and 14 May 202
vcheck; Is visit ready for int. review?; Yes
Allocated COS orbits = 12, but only use 6(Tic-Visit
:proposal-id 16598
:visit-id "2D"
:proposal-version -1
:trans-version "20210514"
:date "29-Jul-2021 15:01:16.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "31"
:si-bright-earth-limb-angle 20.0
:data-volume 348096
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16598
:visit-id "2D"
:obset-id "2D"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2D"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2615
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2D"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2616
:al-overhead-at-end 0
:internal-dur-at-end 38
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2D"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2615
:al-overhead-at-end 0
:internal-dur-at-end 334
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)true30Exposure time not yet calculated.Exposure time not yet calculated.t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g130m,c1291,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=11510.8 s, spectral region:
1239.0 +- 1.0 A achieves SNR=10.0 / 6-pix-resel
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 282.2 cts/s/segment
brightest pixel: 0.001 cts/s/pix at 1304.9 A
Calculation performed 2021-06-18T15:05:22, v0.24t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g130m,c1291,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=11510.8 s, spectral region:
1239.0 +- 1.0 A achieves SNR=10.0 / 6-pix-resel
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 282.2 cts/s/segment
brightest pixel: 0.001 cts/s/pix at 1304.9 A
Calculation performed 2021-06-18T15:05:22, v0.24t48_lya2_etc_scaled_pAV0.50.txt much fainter than observed u band and galex fluxes.
But t48_lya2_etc.txt aggrees well, so redo S/N calcs with those numbers.
COS.sp.1522996 t48_lya2_etc.txt G160M=1243s S/N=20 at 1548.42
COS.sp.1524226 t48_lya2_x4.00_etc.txt G160M/1611 buffer=22020s, bp=0.032
To compromise between this and original 12 orbits, do 6 orbits of COS.
Gets G130M total=7696s, G160M total = 4888s between all CENWAVE/FPPOS
t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g160m,c1623,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=2021.2 s, spectral region:
1549.0 +- 1.0 A achieves SNR=20.0 / 6-pix-resel for combined c1589 & c1623
The exptime for this c1623 exposure has been halved because c1589 & c1623 target the same line.
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 65.7 cts/s/segment
brightest pixel: 0.002 cts/s/pix at 1548.4 A
Calculation performed 2021-06-18T15:05:20, v0.24t48_lya2_etc_scaled_pAV0.50.txt much fainter than observed u band and galex fluxes.
But t48_lya2_etc.txt aggrees well, so redo S/N calcs with those numbers.
COS.sp.1522996 t48_lya2_etc.txt G160M=1243s S/N=20 at 1548.42
COS.sp.1524226 t48_lya2_x4.00_etc.txt G160M/1611 buffer=22020s, bp=0.032
To compromise between this and original 12 orbits, do 6 orbits of COS.
Gets G130M total=7696s, G160M total = 4888s between all CENWAVE/FPPOS
t48_lya2_etc_scaled_pAV0.50.txt; cos,fuv,g160m,c1623,psa,mjd#59670; fp-pos=None, segment=None)
Input file: targets_up_to_May30-2022.csv
Spectral type: M3 ; A_V: 1.2 ; Distance (pc): 160
M*: 0.3 ; log(dm/dt): -7.96
For exptime=2021.2 s, spectral region:
1549.0 +- 1.0 A achieves SNR=20.0 / 6-pix-resel for combined c1589 & c1623
The exptime for this c1623 exposure has been halved because c1589 & c1623 target the same line.
A factor of 2.0 has been applied to the exptime in each exposure.
global countrate (brightest segment): 65.7 cts/s/segment
brightest pixel: 0.002 cts/s/pix at 1548.4 A
Calculation performed 2021-06-18T15:05:20, v0.24/private/var/folders/c1/kkl4zqqs11g637_3q3f43f2m000400/T/OPVisit5597439122567457245.xmlTiming link suitability includes constraints ([Group (2C 2D 2S) Within 1.0 days])The scheduling data was generated by CASM 29.2.CASM was run in Phase II mode.vstatus; 2S; V-WZ-CHA; S/STIS Approved for Submission; P/CRP 15/07/21 ; intrev: complete ; S/WF 29/07/21
vcheck; Enter targ name & Inst. & Resp. Sci.; V-WZ-CHA ; STIS ; CRP
vcheck; ETC numbers entered in APT?; yes
vcheck; Any screening violations?; no
vcheck; M-dwarf check complete and added to box folder?; yes
vcheck; S/N ETC calcs done & documented?; yes ...
Use default accretion model in NUV, observed photometry in the optical.
(See /box/ullyses_tech/ullyses_proposals/survey_c29/16598/wzcha/wzcha-vs-default.png)
vcheck; Field images checked & saved?; yes
vcheck; Selected ACQ strategy?; F28X50LP, S/N=150 in 1.5s
vcheck; Possible ACQ or Sci spoilers?; none
vcheck; Field BOT clear?; yes
vcheck; Visual BOT check for stars not in catalog?; clear
vcheck; Orbit packing finalized?; Yes
vcheck; Buffer times optimized?; yes
vcheck; Verify visit grouping correct; yes
vcheck; phase constraint for ground based observations added?; N/A
vcheck; BETWEENS for coordinated observations added?; yes, 24 Jan to 14 May 2022
vcheck; Is visit ready for int. review?; Yes
Allocated STIS orbits = 1(Tic-Visit
:proposal-id 16598
:visit-id "2S"
:proposal-version -1
:trans-version "20210514"
:date "25-Oct-2021 15:51:35.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 447392
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16598
:visit-id "2S"
:obset-id "2S"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16598
:visit-id "2S"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2615
:al-overhead-at-end 116
:internal-dur-at-end 1231
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3008
:pcs-gap 0
)true10STIS.sp.1524195, F28X50LP, M2V norm I=13.07, S/N=150 in 1.5s.t48_lya2_etc_scaled_pAV0.50.txt is well below observed galex and u band fluxes.
But t48_lya2_etc.txt agrees well so use that instead for S/N and x4 spectrum for BOP
0.8x buffer time for x4 spectrum < 1/2 exposure length, so set buffer to exptime/3 rounded up
STIS.sp.1543442, t48_lya2_x4.00_etc_sed.fits G230L, BP=3.7 c/s, global = 3312, BUFFER=603s
STIS.sp.1543443, t48_lya2_etc.txt S/N=74 at 2788.89 in 1033s.Optical photometry much fainter than scaled accretion model
Renormalize M2 spectrum to observed B mag, but allow for emission lines in 4X accretion model
STIS.sp.1524180 M2V B=16.41, G430L gain=4 SN=20 at 4000 in 212.1s
STIS.sp.1524187 t48_lya2_x4.00_etc_sed.fits G430L gain=4 saturates in 683.6s/expo
STIS.sp.1524187 t48_lya2_x4.00_etc_sed.fits G430L gain=1 saturates in 188s/expoOptical photometry much fainter than scaled accretion model
Renormalize M2 spectrum to observed V mag.
STIS.sp.1524182 M2V V=15.5, G750L gain=4 SN=20 at 5700 in 58.6s
STIS.sp.1524184 t48_lya2_x4.00_etc_sed.fits G750L gain=4 saturates in 81.8s/expo