STIS Cycle-19 Calibration Phase-1 Last Revised: July 15, 2011 Proposal ID: 12740 Title: CCD Performance Monitor PI: Michael A. Wolfe Co-I(s): --------------------------------------------------------------------------- # Orbit estimates are TOTAL for all of cycle-19; assume 52 weeks # 01 March 2012, 01 September 2012 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 2012 and then in September 2012. --------------------------------------------------------------------------- # 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: 0.2 ADU, 0.05 ADU Comments on Accuracy: Read-out noise: good to 0.2 electrons. Gain error < 0.05 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. --------------------------------------------------------------------------- # 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..........................: 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. --------------------------------------------------------------------------- # Special needs of this proposal? Scheduling: Schedule every six months. Start on March 01, 2012. 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 19 Science Fraction of science programs supported by this calibration: 53% 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: --------------------------------------------------------------------------- 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): stisron.cl and stisgain2.cl. The script stisron.cl calculates the read out noise and stisgain2.cl 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.