STScI Logo

Space Telescope Imaging Spectrograph
Phase I: CCD Bias and Readnoise Monitor Part 1

STIS Cycle-18 Calibration Phase-1

Last Revised: August 24, 2010
Proposal ID: 12402
Title: CCD Bias and Read Noise Monitor Part 1
PI: Michael A. Wolfe
Co-I(s): William Van Dyke Dixon, Elena Mason
---------------------------------------------------------------------------
# Orbit estimates are TOTAL for all of cycle-18; assume 26 weeks 
# 01 November 2010 to 30 April 2011

Total Prime Orbits:             0
External Parallel Orbits:       0
Internals or no-impact orbits:  181
Comments on orbit estimate:   Orbits will occur once a day
starting in November 2010 and ending in April 2011.  


---------------------------------------------------------------------------
# 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 bin settings 
at gain=1, and 1x1 at gain = 4, to build up high S/N superbiases 
and track the evolution of hot columns. Also GAIN=1 and GAIN=4, 1x1
biases through AMPS A and C to use in combination with biases taken
through AMP D for monitoring of the read noise
       
               
Description:  Take fullframe bias exposures in the 1x1 bin settings at 
gain=1, and 1x1 at gain = 4. Take fullframe biases through AMPS A and C. 
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 and 0.3 ADU at gain 4 1x1
     
Products: Weekly CDBS reference files (superbiases)    



---------------------------------------------------------------------------
# THE REST OF THIS FORM IS FOR INTERNAL USE
---------------------------------------------------------------------------
# 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, AMPS A and C 
Comments: Take exposure four times a day.
---------------------------------------------------------------------------
# Special needs of this proposal?

Scheduling: Schedule once a day. Start on November 01, 2010.

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:


-------------------------------------------------------------------------
# Link to Cycle 18 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:

---------------------------------------------------------------------------

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:	Retrieve 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. Furthermore, acquisition of biases
through AMPS A and C will allow the read noise monitor to be 
accomplished.