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 Aug 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.
- MAR registered-photon-map in fits
Statistics:
# IMAGE NPIX MEAN RMS MIN MAX
ACIS_mar07 6004901 8.176 11.861 0.0 717.0
I2 node 0 262654 8.636616 3.474134 0.0 48.0
I2 node 1 262654 9.282087 3.980772 0.0 299.0
I2 node 2 262654 9.478279 4.423496 0.0 93.0
I2 node 3 262654 8.893683 3.747700 0.0 48.0
I3 node 0 262654 9.222509 3.620935 0.0 46.0
I3 node 1 262654 11.853909 15.633994 0.0 336.0
I3 node 2 262654 9.680249 3.879477 0.0 41.0
I3 node 3 262654 8.830383 3.549994 0.0 137.0
I2 node 0 262654 14.769466 4.545481 0.0 67.0
I2 node 1 262654 15.248759 5.395276 1.0 92.0
I2 node 2 262654 16.366333 4.950773 1.0 126.0
I2 node 3 262654 15.400348 4.425534 2.0 476.0
I3 node 0 262654 15.749674 7.579724 0.0 159.0
I3 node 1 262654 17.885831 6.709902 0.0 127.0
I3 node 2 262654 17.430917 5.427593 0.0 159.0
I3 node 3 262654 15.938025 4.774795 1.0 110.0
- Jul 1999 - Mar 2007 registered-photon-map in fits
Statistics:
IMAGE NPIX MEAN RMS MIN MAX
ACIS_total 6004901 995.90 1379.86 0.0 58955.0
2 node 0 262654 716.585602 125.951823 0.0 2960.0
I2 node 1 262654 756.770136 172.617320 0.0 8706.0
I2 node 2 262654 769.463131 145.176414 0.0 2759.0
I2 node 3 262654 773.786172 184.277364 0.0 3609.0
I3 node 0 262654 821.904045 207.913102 0.0 4954.0
I3 node 1 262654 845.439163 574.658931 0.0 15469.0
I3 node 2 262654 753.976400 125.712342 0.0 3058.0
I3 node 3 262654 744.455429 135.688158 0.0 13780.0
I2 node 0 262654 1154.365533 143.772695 543.0 12552.0
I2 node 1 262654 1226.843052 248.587167 578.0 6037.0
I2 node 2 262654 1390.022262 279.278456 767.0 9366.0
I2 node 3 262654 1347.907289 220.290362 771.0 12388.0
I3 node 0 262654 2217.950954 1220.852418 843.0 10490.0
I3 node 1 262654 3383.267873 1745.702020 0.0 11507.0
I3 node 2 262654 2387.363948 765.833830 702.0 4950.0
I3 node 3 262654 1759.048137 299.710581 888.0 7361.0
- MAR 2007 dose PNG image
- MAR I3 dose PNG image
- MAR S3 dose PNG image
- TOTAL JUL 1999 - JAN 2007 dose PNG image
- TOTAL I3 dose PNG image
- TOTAL S3 dose PNG image