Re: about bad pixel files

From: Eric Schlegel (ems@head-cfa.harvard.edu)
Date: Thu Sep 07 2000 - 13:28:30 EDT


Hello --

    My apologies for the slow response, but I was away from the
office for about a week.

>
> I have tried to use my own bad pixel file, but the "mkarf" stops
> with an error message like "end of file" can not read the file.

    I'm not certain I understand what you are attempting to do. Based
on this description, I infer you are trying to define a bad pixel file
for a spectrum and use that in sherpa. Correct?

    If my understanding is correct, I do not think that approach will
work. At least, I am not aware that sherpa can handle bad pixels defined
in that manner.
    
    I'm looking into what ways exist to define bad pixels.
>
> By the way, Does any one detect several chunks of energy dependent(?)
> bad columns in Acis-S S3 pointings with long exposures.

    I am unaware of any such detections. Could you send me a list?
Are the bad columns in the Level 2 data?

 -- eric

-- 
Eric M. Schlegel, PhD     Harvard-Smithsonian Center for Astrophysics
Voice: Real: 617.495.7086               Mail Stop 4, 60 Garden Street
    Virtual: eschlegel@cfa.harvard.edu            Cambridge, MA 02138
                Chandra X-ray Observatory Science Center
If "ping" checks a machine's state, can I use "depth-charge" to reboot?



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