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STIS Cycle-20 Calibration Phase-1

Last Revised: Aug 22, 2012
Proposal ID: 13130
Title: CCD Performance Monitor
PI: Svea Hernandez
Co-I(s): Justin Ely
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# Orbit estimates are TOTAL for all of cycle-20; assume 52 weeks
# 01 March 2013, 01 September 2013

Total Prime Orbits: 0
External Parallel Orbits: 0
Internals or no-impact orbits: 14
Comments on orbit estimate: Orbits will occur every six months
starting in March 2013 and then in September 2013.


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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: To measure the baseline performance of the CCD system.

Description: This activity measures the baseline performance and
commandability of the CCD subsystem. Only primary amplifier D is
used. Bias and Flat Field exposures are taken in order to measure
read noise, CTE, and gain. Full frame observations are made.
Bias frames are taken in subarray readouts to check the bias level for
ACQ and ACQ/PEAK observations.

Accuracy: 0.3 ADU, 0.08 ADU

Comments on Accuracy: Read-out noise: good to 0.3 electrons.
Gain error < 0.08 electrons.

Products: Possible updates of the following CDBS files: Possible update of
the gain, bias level, and read noise values in ccdtab. This also provides a
relative measure of CTI via the extended pixel edge response test. Possible
flight software updates of table CCDBiasSubtractionValue. Possible reports
in STAN and a summary in the end of cycle ISR.



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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..........................: TUNGSTEN
Type of Acquisition.....................: FLAT
Detector for observation................: STIS/CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: 50CCD
Central Wavelength......................:
Exposure Time...........................: 0.1s, 0.3s, 0.4s
Number of Iterations ...................: 2
Gain ...................................: 1, 2, 8
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........:
Comments: Take exposure every six months

Target or lamp..........................: TUNGSTEN
Type of Acquisition.....................: FLAT
Detector for observation................: STIS/CCD
Operating mode .........................: ACCUM
Spectral Element........................: MIRROR
Aperture................................: F25ND3
Central Wavelength......................:
Exposure Time...........................: 10.0s
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.........:
Comments: Take exposure every six months

Target or lamp..........................: TUNGSTEN
Type of Acquisition.....................: FLAT
Detector for observation................: STIS/CCD
Operating mode .........................: ACCUM
Spectral Element........................: G750M
Aperture................................: 52X0.5
Central Wavelength......................: 6768
Exposure Time...........................: 0.2s, 0.4s
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........:
Comments: Take exposure every six months

Target or lamp..........................: TUNGSTEN
Type of Acquisition.....................: FLAT
Detector for observation................: STIS/CCD
Operating mode .........................: ACCUM
Spectral Element........................: G750M
Aperture................................: 52X2
Central Wavelength......................: 6768
Exposure Time...........................: 0.2s, 0.3s, 0.5s, 1.0s, 5.0s, 10.5s, 20.8s
Number of Iterations ...................: 1
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........:
Comments: Take exposure every six months

Target or lamp..........................: BIAS
Type of Acquisition.....................:
Detector for observation................: STIS/CCD
Operating mode .........................:
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:
Exposure Time...........................: 0
Number of Iterations ...................: 2
Gain ...................................: 1, 2, 8
BOP Predicted Local Count Rate for MAMA.:
BOP Predicted Global Count Rate for MAMA:
ETC PID IDs for Count Rates.............:
Special Requirements or options.........:
Comments: Take exposure every six months.

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# Special needs of this proposal?

Scheduling: Schedule every six months. Start on March 01, 2013.

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 20 Science

Fraction of science programs supported by this calibration:
23% 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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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):
Readnoise_Monitor.py and stisgain2.py. The script Readnoise_Monitor.py calculates the
read out noise and stisgain2.py calculates the gain and
read out noise.


Description of analysis Plans:
Provides baseline measurements of CCD gains, read noise,
charge transfer efficiency, and performance verification
of binning and subarray readout capabilities. Provides a rough assessment
of changes in flat field features due to dust motes or other particulates.