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Space Telescope Imaging Spectrograph
CCD Bias Monitor - Part 1

STIS Cycle-17 Calibration Phase-1 Template

Last Revised: February 19, 2009
Proposal ID: 11846
Title: CCD Bias Monitor Part 1
PI: Michael A. Wolfe
Co-I(s): Rachel Osten
         Charles Proffitt
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# Orbit estimates are TOTAL for all of cycle-17; assume 35 weeks 
# 06 July 2009 to 04 March 2010

Total Prime Orbits:             0
External Parallel Orbits:       0
Internals or no-impact orbits:  242
Comments on orbit estimate:   Orbits will occur once a day
starting in July 2009 and ending in March 2010.  


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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: Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings 
at gain=1, and 1x1 at gain = 4, to build up high S/N superbiases 
and track the evolution of hot columns.
       
               
Description:  Take fullframe bias exposures in the 1x1, 1x2, 2x1, 
and 2x2 bin settings at gain=1, and 1x1 at gain = 4. All exposures 
are internals and fit in occultation orbits. 
               
Accuracy: < 0.1 ADU

Comments on Accuracy: Bias level: better than 0.1 ADU at any
 position within CCD frame superbias rms: 0.4 ADU at 
gain 1 1x1, 0.8 ADU at gain 1 1x2, 2x1, 2x2, and
0.3 ADU at gain 4 1x1
     
Products: Weekly CDBS reference files (superbiases)    



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# THE REST OF THIS FORM IS FOR INTERNAL USE
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# Target information (copy for each target)

Target Name.............................: n/a (internal)	
RA.............................................: n/a 		
Dec...........................................: n/a		
Flux (and units)........................: n/a	
Visibility window (if known or relevant): n/a
Comment on choice of target: n/a

# Table of exposures (copy for each exposure):

Target or lamp..........................: BIAS
Type of Acquisition.....................: 
Detector for observation................: STIS/CCD
Operating mode .........................: 
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:  
Exposure Time...........................: 0s
Number of Iterations ...................: 14
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=1, 1x1
Comments: Take exposure once a day

Target or lamp..........................: BIAS
Type of Acquisition.....................: 
Detector for observation................: STIS/CCD
Operating mode .........................:  
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:  
Exposure Time...........................: 0s
Number of Iterations ...................: 3
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=4, 1x1
Comments: Take exposure once a day.

Target or lamp..........................: BIAS
Type of Acquisition.....................: 
Detector for observation................: STIS/CCD
Operating mode .........................:  
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:  
Exposure Time...........................: 0s
Number of Iterations ...................: 2
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........: GAIN=1, 1x2, 2x1, 2x2 
Comments: Take exposure four times a day.
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# Special needs of this proposal?

Scheduling: Schedule once a day. Start on July 06, 2009.

Prerequisites: n/a

PDB update?               no
On-board table update?    no

# 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 17 Science

Fraction of science programs supported by this calibration: 60% of STIS

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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Expected FTE weeks for analysis:            2   
Required turnaround on analysis (weeks):    2
Data volume (Mb needed for analysis):       10.5Mb
Special software needed for analysis? (Describe): 
refbias, basejoin, weekbias, and refaver are needed for 
the creation of superbiases. 
 
Description of analysis Plans:	Retreive and construct superbiases.
These superbiases are compared to previous superbiases and the
image ststistics are checked to see if there are any anomalous
statistical deviations.