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From: "Szostek, Anna" <aszostek@slac.stanford.edu>
Subject: Re: Particle background does not dominate over photon spectrum
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From: "Szostek, Anna" <aszostek@slac.stanford.edu>
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
Date: Mon, 21 Mar 2011 13:57:03 -0700
Subject: Re: Particle background does not dominate over photon spectrum
Dear Ignacio,
Thank you very much for your reply. I followed your suggestion and used the task
emtaglenoise to remove noise events from the event file and repeated the
analysis but the CCD 4 still shows excess events in final image and background
maps look the same as before. 

Would you have some more advice for me to help diagnose this problem?

Best regards
Anna


On Mar 16, 2011, at 6:09 AM, Ignacio de la Calle wrote:

> Dear Anna,
> 
> I did not get an specific reply to the problem of CCD4 in MOS1. But the
problem
> you report is probably, as you have noted, due to the known issue regarding
> noise
> in these CCD. Have a look at the folowing link,
> 
> http://xmm.esac.esa.int/external/xmm_user_support/documentation/uhb/node36.html
> 
> and also at the link given in this section to section 4.3.2 (point
'EPIC-MOS low
> 
> energy noise in two peripheral CCDs'). There is a SAS task called
emtaglenoise
> which allows to tag these events. See if this helps (you will fid more
> information
> in the help pages of the task). If you still need any more help or
information
> regarding this issue, I will contact again the ESAS developers to see if
they
> have any further sugesstion.
> 
> Many thanks,
> 
> Ignacio de la Calle
> XMM-Newton SOC


Reply 1

Resend
From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: aszostek@slac.stanford.edu
Subject: Re: Particle background does not dominate over photon spectrum (PR#47581)
Date: Tue Mar 22 16:29:17 2011
Dear Anna,

I am afraid that there is not much more you can do. If you have filtered 
the observation, and run the emtaglenoise task over it and the problem
does not fully go away, there is not much more you can do. As I said, this
looks like a particularly bad observation. You will have to judge if the 
level of noise remaining after filtering is good enough for you to extract
whatever scientific information you want to derive from this observation.

Thanks,

Ignacio de la Calle
XMM-Newton SOC

> Dear Ignacio,
> Thank you very much for your reply. I followed your suggestion and used the
task
> emtaglenoise to remove noise events from the event file and repeated the
> analysis but the CCD 4 still shows excess events in final image and
background
> maps look the same as before. 
> 
> Would you have some more advice for me to help diagnose this problem?
> 
> Best regards
> Anna
> 
> 
> On Mar 16, 2011, at 6:09 AM, Ignacio de la Calle wrote:
> 
>> Dear Anna,
>> 
>> I did not get an specific reply to the problem of CCD4 in MOS1. But
the
> problem
>> you report is probably, as you have noted, due to the known issue
regarding
>> noise
>> in these CCD. Have a look at the folowing link,
>> 
>> http://xmm.esac.esa.int/external/xmm_user_support/documentation/uhb/node36.html
>> 
>> and also at the link given in this section to section 4.3.2 (point
'EPIC-MOS
> low
>> 
>> energy noise in two peripheral CCDs'). There is a SAS task called
emtaglenoise
>> which allows to tag these events. See if this helps (you will fid more
>> information
>> in the help pages of the task). If you still need any more help or
information
>> regarding this issue, I will contact again the ESAS developers to see
if
they
>> have any further sugesstion.
>> 
>> Many thanks,
>> 
>> Ignacio de la Calle
>> XMM-Newton SOC
> 
> 


Reply 2

Resend
From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: aszostek@slac.stanford.edu
Subject: Re: Particle background does not dominate over photon spectrum (PR#47581)
Date: Thu Mar 24 10:28:58 2011
Dear Anna,

Please find in the following link the release note of the SAS patch,
which includes the ESAS patch:

http://xmm.esac.esa.int/sas/current/sas_news.shtml

Regards,

Ignacio de la Calle
XMM-Newton SOC

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