Columns in Table

• Warm Pixel: a list of warm pixels currently observed
• Flickering: any warm pixels which were on and off 3 times or more in the last 3 months
• Past Warm Pixels: a list of all pixels appeared as warm pixels in past
• History: history of when a particular warm pixel was on or off
• Hot Pixel: a list of hot pixels currently observed
• Flickering: any hot pixels which were on and off 3 times or more in the last 3 months
• Past Hot Pixels: a list of all pixels appeared as hot pixels in past
• History: history of when a particular hot pixel was on or off
• Warm Column: a list of warm columns currently observed
• Flickering: any warm columns which were on and off 3 times or more in the last 3 months
• Past Warm Columns: a list of all columns appeared as warm columns in past
• History: history of when a particular warm columns was on or off

Previously unknown bad pixels/columns appeared in the last 14 days:

Warm Pixels	No New Warm Pixels
Hot Pixels	No New Hot Pixels
Bad Columns	No New Bad Columns

Bad Pixels/Columns

CCD	Data	Warm Pixel History	Hot Pixel History	Bad Column History	Data List
CCD0	Bad Pixels Today	Change	Change	Change	Data Used
CCD1	Bad Pixels Today	Change	No History	Change	Data Used
CCD2	Bad Pixels Today	Change	No History	Change	Data Used
CCD3	Bad Pixels Today	Change	No History	Change	Data Used
CCD4	No Bad Pixels Today	Change	Change	Change	Data Used
CCD5	Bad Pixels Today	Change	Change	Change	Data Used
CCD6	Bad Pixels Today	Change	No History	Change	Data Used
CCD7	No Bad Pixels Today	Change	No History	Change	Data Used
CCD8	No Bad Pixels Today	Change	No History	Change	Data Used
CCD9	No Bad Pixels Today	Change	No History	Change	Data Used

Bad Pixel Trend Plots
Plot for History of Warm Pixel: Front Side CCDs
Plot for History of Warm Pixel: CCD 5
Plot for History of Warm Pixel: CCD 7
Plot for History of Bad Columns: Front Side CCDs
Plot for History of Bad Columns: CCD 5
Plot for History of Bad Columns: CCD 7

A bad pixel was selected as follows:

• acis*bias0.fits in a given period were obtained
• compute an average of ADU for each CCD
• compare the value of each pixel to the CCD average, if a pixel value was 5 sigma higher than the average, a local average (32x32) was computed
• if the pixel value was still 5 sigma higher than the local average, it was marked as a possible candidate for a warm pixel.
• if three consecutive(sp) bias frames had the same pixel marked as a warm pixel candidate, the pixel was listed as a warm pixel.
• if the pixels appear and disappear repeatedly during the last three months the pixels are listed in flickering pixels
• if the pixels which appeared in "current warm pixels" list, even once in the past the pixels are parmanently listed in "Past Warm Pixels" list
• hot pixels are defined as warm pixels with an adu value of greater than the CCD average +1000.
• if the pixel was located at the edge of the CCD (y = 1023, 1024), it is ignored and not included on either the list.
  
• for a hot pixel, a process was same, except a threshold was a ccd average plus 1000 counts
  

A bad column was selected as follows:

• each column was averaged out, and compared to an average for an entire ccd.
• if the average of the column was 5 sigma higher than the average of the ccd compare the column average to a local average (10 columns).
• if the column was still 5 sigma higher than the local average, mark it as a bad column candidate
• if the column appeared as a bad column for a 3 consecutive frames, it was marked as a real bad column.