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.
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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.
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Statistics: # IMAGE NPIX MEAN RMS MIN MAX ACIS_mar10 6004901 10.644 18.781 0.0 13413 I2 node 0 262654 11.623119 4.291749 0.0 76.0 I2 node 1 262654 13.039330 6.479634 0.0 336.0 I2 node 2 262654 12.091198 4.398658 0.0 91.0 I2 node 3 262654 11.798204 4.589748 0.0 75.0 I3 node 0 262654 11.495319 4.229780 0.0 59.0 I3 node 1 262654 12.317799 12.205491 0.0 304.0 I3 node 2 262654 11.526925 4.101680 0.0 158.0 I3 node 3 262654 13.136490 28.059431 0.0 9247.0 S2 node 0 262654 13.913507 12.211772 0.0 5719.0 S2 node 1 262654 15.473249 5.808744 1.0 115.0 S2 node 2 262654 16.730702 19.637584 1.0 9102.0 S2 node 3 262654 16.091532 8.556732 1.0 929.0 S3 node 0 262654 15.203615 9.302606 0.0 165.0 S3 node 1 262654 17.380925 10.783266 0.0 2615.0 S3 node 2 262654 16.502095 5.666400 1.0 66.0 S3 node 3 262654 14.611364 5.216289 1.0 63.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1364.77 1841.68 0.0 82953.0 I2 node 0 262654 1111.606480 210.817473 0.0 5244.0 I2 node 1 262654 1171.480077 281.186120 0.0 20687.0 I2 node 2 262654 1209.405987 263.777075 0.0 8679.0 I2 node 3 262654 1204.869451 307.002219 0.0 27496.0 I3 node 0 262654 1266.492579 311.635951 0.0 6064.0 I3 node 1 262654 1327.848816 971.305517 0.0 25212.0 I3 node 2 262654 1147.484239 203.844174 0.0 5193.0 I3 node 3 262654 1135.205318 218.985369 0.0 20670.0 S2 node 0 262654 1647.625548 222.812040 827.0 19958.0 S2 node 1 262654 1751.670880 367.329485 861.0 9409.0 S2 node 2 262654 1942.657878 362.384105 1113.0 13354.0 S2 node 3 262654 1870.416792 258.067764 1085.0 27267.0 S3 node 0 262654 2798.009532 1337.321868 1156.0 11299.0 S3 node 1 262654 4044.881310 1826.861206 0.0 12118.0 S3 node 2 262654 3033.752145 854.469090 1077.0 7591.0 S3 node 3 262654 2312.385675 373.359526 1233.0 8792.0
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| Dec 2009 | Sep 2009 | Jun 2009 | Mar 2009 |
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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
March 2010 Focal Temperature
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