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From: liu@mpe.mpg.de
Subject: Astrometry correction of EPIC image
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Date: Tue, 15 May 2018 10:01:55 GMT
From: liu@mpe.mpg.de
To: xmmhelp@sciops.esa.int
CC: liu@mpe.mpg.de
Subject: Astrometry correction of EPIC image
Full_Name: Teng Liu
Submission from: (NULL) (130.183.75.157)


I didn't find any task in SAS to perform astrometry correction on the EPIC
images. I noticed that astrometry correction has been done in the PPS OBSMLI
file using the task "catcorr". Since I don't have a better reference catalog
than SDSS, which is used by "catcorr", I think it's meaningless to do astrometry
correction again by myself. In order to make an EPIC image with a good position
accuracy, I can just use the keyword in the header of the OBSMLI file to correct
the corresponding keyword in the event file of PN and MOS before generating
images. Am I right?


Reply 1

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From: Simone Migliari <xmmhelp@sciops.esa.int>
To: liu@mpe.mpg.de
Subject: Re: Astrometry correction of EPIC image (PR#83331)
Date: Tue May 15 15:26:48 2018
Dear Teng Liu

yes, that should work to obtain the image with the correction offset. 

Regards
Simone  


> Full_Name: Teng Liu
> Submission from: (NULL) (130.183.75.157)
> 
> 
> I didn't find any task in SAS to perform astrometry correction on the EPIC
> images. I noticed that astrometry correction has been done in the PPS
OBSMLI
> file using the task "catcorr". Since I don't have a better reference
catalog
> than SDSS, which is used by "catcorr", I think it's meaningless to do
astrometry
> correction again by myself. In order to make an EPIC image with a good
position
> accuracy, I can just use the keyword in the header of the OBSMLI file to
correct
> the corresponding keyword in the event file of PN and MOS before
generating
> images. Am I right?
> 
> 

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