STIS Cycle-17 Calibration Phase-1
Last Revised: September 3, 2008
Proposal ID: 10034
Title: STIS/MAMA Dark Measurements C17
PI: Charles R. Proffitt
Co-I(s):
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# Orbit estimates are TOTAL for all of cycle-17; assume 68 weeks
# (7 December 2008 to 31 March 2010)
Total Prime Orbits: 0
External Parallel Orbits: 0
Internals or no-impact orbits: 284
Comments on orbit estimate: 1 orbit per MAMA, 2 executions per week
for 68 weeks (2 x 68 x 2 detectors)
plus extra 2 x 6 orbit blocks for FUV MAMA
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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: This test performs the routine monitoring of the MAMA
detector dark noise. This proposal will provide the primary
means of checking on health of the MAMA detectors systems
through frequent monitoring of the background count rate.
The purpose is to look for evidence of change in the dark
rate, indicative of detector problems developing.
Description: Two times a week 1 23min exposure is taken with the FUV and
NUV MAMAs with the shutter closed. For each detector, the
second exposure in the weekly pair should be taken 4.5 to
7.5 orbits after the first exposure of the pair. This
ensures they are taken in different parts of the same SAA
free interval. The exposures are taken in ACCUM mode. The
length of the exposures is chosen to make them parallels.
Two times a year a 6 exposure sequence of 21.8 m FUV-MAMA
TIME-TAG darks are taken over the course of a single SAA
free period.
Accuracy: 1%
Comments on Accuracy: Each measurement will give a statistical
uncertainty of 1% for the global dark rate.
Products: CDBS DRK files; 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:
# Table of exposures (copy for each exposure)
Target or lamp..........................: DARK
Type of Acquisition.....................:
Detector observation....................: STIS/FUV-MAMA
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:
Exposure Time...........................: 23 min (for each MAMA)
BOP Predicted Local Count Rate for MAMA.: 1e-5 c/s/p
BOP Predicted Global Count Rate for MAMA: 10 c/s
ETC PID IDs for Count Rates.............: n/a
Special Requirements....................:
Comments: Schedule two visits per week for each detector
Target or lamp..........................: DARK
Type of Acquisition.....................:
Detector observation....................: STIS/NUV-MAMA
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:
Exposure Time...........................: 23 min (for each MAMA)
BOP Predicted Local Count Rate for MAMA.: 1e-3 c/s/p
BOP Predicted Global Count Rate for MAMA: 1500 c/s
ETC PID IDs for Count Rates.............: n/a
Special Requirements....................:
Comments: Schedule two visits per week for each detector
Target or lamp..........................: DARK
Type of Acquisition.....................:
Detector observation....................: STIS/FUV-MAMA/TIME-TAG
Spectral Element........................: DEF
Aperture................................: DEF
Central Wavelength......................:
Exposure Time...........................: 21.8 min
BOP Predicted Local Count Rate for MAMA.: 1e-5 c/s/p
BOP Predicted Global Count Rate for MAMA: 10 c/s
ETC PID IDs for Count Rates.............: n/a
Special Requirements....................:
Comments: Six visits grouped in a single SAA free period twice per year
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# Special needs of this proposal?
Scheduling: Schedule two visits per week for each detector. Start on Dec 8
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: 70% 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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# Analysis Plan
Expected FTE weeks for analysis: 4
Required turnaround on analysis (weeks): 4 weeks
Data volume (Mb needed for analysis): 50 Mb
Special software needed for analysis? (Describe): None
Description of analysis Plans:
Measure dark current and look for evidence of change in dark indicative of
detector problem developing. Data will be co-added each month and compared to
previous months (same for periods of 6 months). Develop temperature dependant
NUV darks as well as FUV darks for various glow levels. Create DRK images for
pipeline.
