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.
- JUL registered-photon-map in fits
Statistics:
# IMAGE NPIX MEAN RMS MIN MAX
ACIS_jul06 6004901 14.9613 34.331 0.0 990.0
I2 node 0 262654 9.449642 3.620063 0.0 60.0
I2 node 1 262654 10.114114 4.081870 0.0 356.0
I2 node 2 262654 10.453339 4.533865 0.0 103.0
I2 node 3 262654 9.882995 3.967465 0.0 57.0
I3 node 0 262654 9.668411 3.728231 0.0 47.0
I3 node 1 262654 10.382519 9.427812 0.0 211.0
I3 node 2 262654 9.382061 3.519292 0.0 50.0
I3 node 3 262654 9.423279 3.618857 0.0 201.0
I2 node 0 262654 15.036305 4.521709 1.0 67.0
I2 node 1 262654 16.571281 6.090833 2.0 103.0
I2 node 2 262654 22.017816 9.635474 1.0 117.0
I2 node 3 262654 22.621936 10.343121 1.0 358.0
I3 node 0 262654 53.161198 116.585883 2.0 990.0
I3 node 1 262654 52.952933 53.048399 0.0 448.0
I3 node 2 262654 35.053332 41.873304 2.0 411.0
I3 node 3 262654 24.040239 11.875091 2.0 210.0
- Aug 1999 - Jul 2006 registered-photon-map in fits
Statistics:
IMAGE NPIX MEAN RMS MIN MAX
ACIS_total 6004901 910.404 1281.566 0.0 43766.0
I2 node 0 262654 640.172932 111.565618 0.0 2518.0
I2 node 1 262654 674.458395 152.565922 0.0 5280.0
I2 node 2 262654 678.840759 120.789107 0.0 2290.0
I2 node 3 262654 678.254956 153.459916 0.0 3175.0
I3 node 0 262654 729.435473 177.678270 0.0 4684.0
I3 node 1 262654 753.750183 503.095427 0.0 13607.0
I3 node 2 262654 674.229128 110.703467 0.0 2633.0
I3 node 3 262654 666.829456 120.552323 0.0 12330.0
I2 node 0 262654 1041.240173 130.008904 483.0 12348.0
I2 node 1 262654 1103.296195 222.304491 515.0 5372.0
I2 node 2 262654 1257.537860 256.550926 696.0 8765.0
I2 node 3 262654 1227.142579 209.152738 695.0 9323.0
I3 node 0 262654 2057.896078 1212.580242 748.0 10350.0
I3 node 1 262654 3218.344577 1732.002267 0.0 11358.0
I3 node 2 262654 2234.184367 749.178290 633.0 4806.0
I3 node 3 262654 1623.046728 285.579744 780.0 6974.0
- JUL 2006 dose PNG image
- JUL I3 dose PNG image
- JUL S3 dose PNG image
- TOTAL AUG 1999 - JUL 2006 dose PNG image
- TOTAL I3 dose PNG image
- TOTAL S3 dose PNG image