- M&TA MONTHLY REPORT -
January 2009
OUTLINE
- Configuration
- ACIS
- Dose
- CTI
- Focal Plane Temperature
- Bad Pixels
- Background
- Corner Pixels
- Bias PlotsAcis Histogram-->
- HRC - Dose
- Gratings - Focus
- Resolving Power, E/dE
- SIM Twist
- PCAD
- ACA Trending
- Gyro bias drift
- Radiation Zone Timing
- Trending
- Quarterly Trends
- Spacecraft Motions
Configuration/Radiation Overview for January 2009
TOP
ACIS
- ACIS DOSE registered-photon-map
The steps we took to compute the dose map are;
- Level 1 Event files for a specified month are obtained from archive.
- Image data including I2, I3, S2, S3 CCDs are extracted from all event files.
- All the extracted image data were merged to create a month long exposure map for the month.
- The exposure map is opened with ds9, and check a distribution of count rates against energy.
From this, estimate the upper threshold value. Any events beyond this upper threshold are
assumed erroneous events such as bad pixels.
- Using this upper threshold, the data is filtered, and create a cleaned exposure map for the month.
- The exposure map from each month from the Sep 1999 is added up to create a cumulative exposure
map for each month.
- Using fimgstatistic, we compute count rate statistics for each CCDs.
- For observations with high data drop rates (e.g., Crab nebula, Cas A), we corrected the
observations by adding events.
Note: Counts and RMS's of Cumulative maps are lower than the previous months. This is because we excluded
extreme outliers.
Please check more detail plots at Telemetered Photon Dose Trend page.
- JAN registered-photon-map in fits
Statistics:
# IMAGE NPIX MEAN RMS MIN MAX
ACIS_jan09 6004901 9.132 14.69 0.0 744.0
I2 node 0 262654 7.277817 3.155586 0.0 39.0
I2 node 1 262654 7.801025 3.536021 0.0 294.0
I2 node 2 262654 7.742908 3.289845 0.0 54.0
I2 node 3 262654 7.545724 3.393373 0.0 150.0
I3 node 0 262654 8.062775 3.472225 0.0 43.0
I3 node 1 262654 8.588287 8.130503 0.0 204.0
I3 node 2 262654 7.738711 3.238853 0.0 60.0
I3 node 3 262654 7.676586 3.264439 0.0 113.0
I2 node 0 262654 13.420929 7.497614 0.0 315.0
I2 node 1 262654 14.907843 14.364397 0.0 206.0
I2 node 2 262654 16.832460 19.997550 0.0 262.0
I2 node 3 262654 13.865425 9.110147 0.0 744.0
I3 node 0 262654 16.643264 16.010118 0.0 287.0
I3 node 1 262654 15.140799 6.734980 0.0 112.0
I3 node 2 262654 16.481771 11.528508 0.0 223.0
I3 node 3 262654 18.419635 24.967049 0.0 283.0
- Jul 1999 - Jan 2009 registered-photon-map in fits
Statistics:
IMAGE NPIX MEAN RMS MIN MAX
ACIS_total 6004901 12.19.8 1667.15 0.0 74273.0
I2 node 0 262654 942.680035 169.722054 0.0 4270.0
I2 node 1 262654 997.215239 231.906785 0.0 16115.0
I2 node 2 262654 1011.657784 195.300339 0.0 8397.0
I2 node 3 262654 1012.833911 248.108655 0.0 27253.0
I3 node 0 262654 1065.584601 257.568556 0.0 5595.0
I3 node 1 262654 1106.573177 799.393884 0.0 21183.0
I3 node 2 262654 984.276425 168.263742 0.0 4260.0
I3 node 3 262654 972.410721 180.705618 0.0 18015.0
I2 node 0 262654 1462.051586 192.006717 716.0 19806.0
I2 node 1 262654 1550.775272 320.318192 747.0 8091.0
I2 node 2 262654 1729.576846 328.423696 969.0 11460.0
I2 node 3 262654 1669.186321 244.907089 955.0 22400.0
I3 node 0 262654 2565.913373 1294.332634 1040.0 10978.0
I3 node 1 262654 3775.875665 1791.265060 0.0 11874.0
I3 node 2 262654 2777.130925 817.436885 924.0 6281.0
I3 node 3 262654 2095.908598 346.700972 1099.0 8246.0
- JAN 2009 dose PNG image
- JAN I3 dose PNG image
- JAN S3 dose PNG image
- TOTAL JUL 1999 - JAN 2009 dose PNG image
- TOTAL I3 dose PNG image
- TOTAL S3 dose PNG image
Integrated Exposure Maps of Last 12 Months
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Oct 2008 |
Jul 2008 |
Apr 2008 |
Jan 2008 |
The Mean Detrended CTI
We report CTIs with a refined data definition. CTIs were computed for the temperature
dependency corrected data.
Please see
CTI page
for detailed explanation.
CTI's are computed for Mn K alpha, and defined as slope/intercept x10^4 of row # vs ADU.
Data file here
Focal Plane Temperature
The Mean (max) FPT: -116.06 C std dev: 3.74
mean width: 0.46 days std dev: 0.36
We are using 10 period moving averages to show
trends of peak temperatures and peak widths.
Note, the gaps in the width plot are due to missing/corrupted data.
The following is a plot of focal plane temperature and sun angle, earth angle, and altitude.
Bad Pixels
The plots below were generated with a new warm pixel finding script. Please see
Acis Bad Pixel Page
for details.
Front Side CCDs
Back Side CCD (CCD5)
Acis Count Rate Plot
This monitors the ACIS count Rate vs. EPHIN count Rate.
No sources or CTI observations are removed. For daily updates see:
Ephin/Acis Info

Science instrument background rates
This page shows scientific instrument background data based on Acis
observations. A source region file is generated using get_srcregions
and then the input event file is filtered using the regions in that file
to remove the sources.
Name | Low (keV) | High(KeV) | Description |
SSoft | 0.00 | 0.50 | Super soft photons |
Soft | 0.50 | 1.00 | Soft photons |
Med | 1.00 | 3.00 | Moderate energy photons |
Hard | 3.00 | 5.00 | Hard Photons |
Harder | 5.00 | 10.00 | Very Hard photons |
Hardest | 10.00 | | Beyond 10 keV |

ACIS Corner Pixels
We plot the average corner pixel centroid slope and mean for ACIS observations. Separate
plots are shown for FAINT MODE (3X3) and VFAINT MODE (5X5) observations.
Metric is the centroid of a Gaussian fit to the histogram of corner pixel PHA values
of detected events.
Plus signs are FAINT observations, diamonds are VFAINT observations,
and boxes are VFAINT observations with centroids computed using
only the corner pixels of a 3X3 event island (referred to as AFAINT).
We see a very small upward trend.
I3

S3
ACIS Bias Trends
The bias plus overclock level was calculated as follows:
- Get acisf*bias0.fits is obtained from a database or /dsops/ap/sdp/cache/*/acis/
- Data with timed mode exposure is selected.
- Fits files were divided into 4 quads, then an average of bias level for each quad is computed.
No corrections for dead spots, columns etc were included.
CCDS 0,
2 and
8 are the most
extreme.
An example of Overclock values as reported in FITS file header:

An example of mean bias minus overclock value:

TOP
HRC
Gratings
- Focus
We plot the width of the zero order streak of ACIS/HETG observations and
the width of the zero order image for HRC/LETG observations of point sources.
No significant defocusing trend is seen at this time. See
Gratings Focus
pages.
