STIS Cycle-21 Calibration Phase-1 Template

Last Revised: 19/09/2013
Proposal ID: 13539		
Title:	 STIS CCD Imaging Flat-field Monitor
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:  4
Comments on orbit estimate:     
_ 4 orbits for 50CCD spread across the cycle. One short CORON exposure
will be "attached" to each visit.

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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: Collect high SNR white light imaging flats (aperture=50CCD)
for monitoring purposes and to create a new reference p-flat for
chronographic (and imaging) observations.

Description: Once every 3 months, obtain a series of imaging CCD flats
using the MIRROR and the unfiltered 50CCD aperture.  The 3 months
cadence will allow us to keep monitoring possible (but unlikely)
variations across the cycle; while the combined observations will
allow us to obtain an average signal ~620000 ADU/pix (similarly to the
past cycles) and create a high accuracy (~1%) imaging p-flat. The
remaining time in each orbit/visit will be used to monitor the
stability of the CORON aperture due to the MSM limited
reproducibility.

Accuracy: ~1%
Comments  on  Accuracy: 
Products: Reference p-flat and TIR or ISR as relevant. 


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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
Type of Acquisition.....................: n/a
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................: n/a
Exposure Time...........................: 0.3s, crsplit=no
Number of Iterations ...................: 12
ETC PID IDs for Count Rates.............: n/a
Special Requirements or options.........: GAIN=4
Comments: monitoring, every ~3 months

Target or lamp..........................: Tungsten
Type of Acquisition.....................: n/a
Detector for observation................: CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CORNO
Central Wavelength......................: n/a
Exposure Time...........................: 0.3s, crsplit=no
Number of Iterations ...................: 1
ETC PID IDs for Count Rates.............: n/a
Special Requirements or options.........: GAIN=4
Comments: monitoring, every ~3 months

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# Special needs of this proposal?

Scheduling: 1 orbit every 3 months. 

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: 20% of STIS
total exposure time.

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

List categories  of science  which are best  performed contemporaneous
with this proposal: None 
why:

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# Analysis Plan

Expected FTE weeks for analysis:                     4
Required turnaround on analysis (weeks):             4 
Data volume (Mb needed for analysis):                ~750M
Special software needed for analysis? (Describe):    TBD

Description of analysis Plans: Monitor the 50CDD flat stability across
the cycle + combine current  and past cycle images (as appropriate) to
create  a new  (real) reference  p-flat. Evaluate  the  possibility of
creating  an  l-flat  or  "super  flat" for  the  CORON  observations,
depending on the MSM reproducibility.