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STIS Cycle-21 Calibration Phase-1 Template

Last Revised: 19/09/2013
Proposal ID: 13538
Title: STIS CCD Spectroscopic Flats
PI: Hugues Sana
Co-I(s): Stephen Holland, Charles Proffitt

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# Orbit estimates are TOTAL for all of cycle-21

Total Prime Orbits: 0
External Parallel Orbits: 0
Internals or no-impact orbits: 19
Comments on orbit estimate:
_ 9 orbits for G430M/5216/50CCD spread across the cycle
_ 10 orbits for G430M/512/52x2;

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# This section should be written with a GO audience in mind -- use
# Calibration plans in WFPC-2 handbook as a guide.

Purpose:

Obtain MR grating flats to determine the pixel-to-pixel variation for
spectroscopic observations and produce the cycle 21 reference p-flat
(m and l modes).


Description:

We will use the tungsten lamp and the MR grating G430M to determine
the pixel-to-pixel variation of the STIS CCD in spectroscopic mode.
The flat exposures will be taken with the apertures 50CCD and 52x2 at
5 offset positions in order to map -with a sufficient SNR- the whole
sensitive area of the detector. The expected signal is >=1.4E6
ADU/pixels; while the expected accuracy will be <=1.5%.

Accuracy: <= 1.5%
Comments on Accuracy: How well the spectroscopic science data can be
flattened.
Products: Reference files and ISR as applicable.


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# THE REST OF THIS FORM IS FOR INTERNAL USE
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Observation summary:

# Target information (copy for each target)

Target Name.............................:Tungsten
Flux (and units)........................:Internal Tungsten Lamp

Table of exposures (copy for each exposure as appropriate/desired):

Target or lamp..........................: Tungsten lamp
Type of Acquisition.....................: n/a
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: G430M
Aperture................................: 50CCD
Central Wavelength......................: 5216
Exposure Time...........................: 21s, crsplit=no
Number of Iterations ...................: 9 (X 9 visits)
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4,
Comments: One visit (9 flats) every ~40 days.

Target or lamp..........................: Tungsten lamp
Type of Acquisition.....................: n/a
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: G430M
Aperture................................: 52X2
Central Wavelength......................: 5216
Exposure Time...........................: 550s X 2, crsplit=no
Number of Iterations ...................: 2 (X 10 visits; 1
slit-steps/visit and 5 slit-steps in total).
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, dither with special
slit-pos pattern
Comments:

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# Special needs of this proposal?

Scheduling:

Prerequisites: n/a

PDB update? n/a
On-board table update? n/a

# Special Requirements:
Real time? N
Special commanding? N
Quick Data turnaround? N
Special timing required? N
Other? N
Describe (& justify) special requirements:

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# Link to Cycle 21 Science
# Use the GO + GTO Phase 1 exposure listing and derived statistics
# posted on WWW.

Fraction of science programs supported by this calibration: 16% of
STIS total exposure time.

List categories of science which can't be executed until after this
proposal: None.

List categories of science which are best performed contemporaneous
with this proposal: High S/N CCD spectroscopy
why: For programs that need very high S/N, it would be best if the
epoch of the flats spans the observations. So the flat program should
be spread out over the whole cycle.

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# Analysis Plan

Expected FTE weeks for analysis: 2.5
Required turnaround on analysis (weeks): 2.5
Data volume (Mb needed for analysis): ~2.8G
Special software needed for analysis? (Describe): existing IDL/Python scripts

Description of analysis Plans: Do statistical analysis of data yearly
to check for any significant changes in pixel-to-pixel flats. Co-add
G430M flats after 8 weeks and then again at end of cycle to make new
pfl files.