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From: dbh@physast.uga.edu
Subject: Detection of anomalous chips by mos_back
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2 replies: 1 2
2 followups: 1 2

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Date: Sun, 3 Apr 2011 20:32:55 GMT
From: dbh@physast.uga.edu
To: xmmhelp@sciops.esa.int
Cc: dbh@physast.uga.edu
Subject: Detection of anomalous chips by mos_back
Full_Name: David Henley
Submission from: (NULL) (72.28.180.254)


Hi,

The latest version of mos_back (in SAS 11) now aborts if it finds that an
anomalous chip has not been excluded. This is a useful feature, but as I am
processing a large number of observations, it would be useful to be able to
identify anomalous chips before I start processing (i.e., without having to wait
for mos-spectra and then mos_back to run).

Am I right in thinking that a chip is identified as anomalous for a given
observation if that observation does not have an entry in the relevant
QUIES_CHIP* extension of mos1-qpb.fits.gz or mos2-qpb.fits.gz (from the ESAS CCF
data)? If that's all there is to it, I can extract the relevant information from
mos1-qpb.fits.gz and mos2-qpb.fits.gz, and check for anomalous chips before I
start my processing.

Regards,

Dave Henley


Reply 1

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From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: dbh@physast.uga.edu
Subject: Re: Detection of anomalous chips by mos_back (PR#47647)
Date: Mon Apr  4 12:09:03 2011
Dear David,

Have a look at the following SAS task, it might be what you are
looking for:

http://xmm.esac.esa.int/sas/current/doc/emtaglenoise/index.html

You can have some additional information at:

http://xmm.esac.esa.int/external/xmm_user_support/documentation/uhb/node105.html#uhb:par:other

Let me know if this is what you were after.

Regards,

Ignacio de la Calle
XMM-Newton SOC


Followup 1

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Date: Mon, 4 Apr 2011 10:24:10 -0400
Subject: Re: Detection of anomalous chips by mos_back (PR#47647)
From: David Henley <dbh@physast.uga.edu>
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
Dear Ignacio,

Thank you - emtaglenoise is just what I'm looking for.

Many thanks,

Dave


On Mon, Apr 4, 2011 at 08:09, Ignacio de la Calle
<xmmhelp@sciops.esa.int> wrote:
> Dear David,
>
> Have a look at the following SAS task, it might be what you are
> looking for:
>
> http://xmm.esac.esa.int/sas/current/doc/emtaglenoise/index.html
>
> You can have some additional information at:
>
> http://xmm.esac.esa.int/external/xmm_user_support/documentation/uhb/node105.html#uhb:par:other
>
> Let me know if this is what you were after.
>
> Regards,
>
> Ignacio de la Calle
> XMM-Newton SOC
>
> ================================================================================================
> This message and any attachments are intended for the use of the addressee
or addressees only. The unauthorised disclosure,
>
> use, dissemination or copying (either in whole or in part) of its content
is not permitted. If you received this message in
>
> error, please notify the sender and delete it from your system. Emails can
be altered and their integrity cannot be guaranteed by
>
> the sender.
>
> Please consider the environment before printing this email.
> =================================================================================================
>
>
>



Followup 2

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Date: Wed, 20 Apr 2011 14:23:45 -0400
Subject: Re: Detection of anomalous chips by mos_back (PR#47647)
From: David Henley <dbh@physast.uga.edu>
To: Ignacio de la Calle <xmmhelp@sciops.esa.int>
Dear Ignacio,

It turns out that emtaglenoise does not entirely do what I wanted. I
am analyzing a large number of XMM observations, and am finding many
observations for which mos_back aborts due to anomalous chips, which
were not identified as much by emtaglenoise.

For example, in obs. 0404966301, MOS1-5 is identified as anomalous by
emtaglenoise. However, mos_back aborts with the following message:

 CCD in an anomalous state - noappropriate data
 Rerun analysis excluding instrument: MOS 1   CCD # 4

indicating that MOS1-4 is also anomalous.

What is the method used by mos_back to identify anomalous chips? Is it
at all possible to use this method before one starts (i.e., without
having to wait for mos-spectra to run, and then for mos_back to run
and abort)?

Thanks,

Dave

On Mon, Apr 4, 2011 at 10:24, David Henley <dbh@physast.uga.edu> wrote:
> Dear Ignacio,
>
> Thank you - emtaglenoise is just what I'm looking for.
>
> Many thanks,
>
> Dave
>
>
> On Mon, Apr 4, 2011 at 08:09, Ignacio de la Calle
> <xmmhelp@sciops.esa.int> wrote:
>> Dear David,
>>
>> Have a look at the following SAS task, it might be what you are
>> looking for:
>>
>> http://xmm.esac.esa.int/sas/current/doc/emtaglenoise/index.html
>>
>> You can have some additional information at:
>>
>> http://xmm.esac.esa.int/external/xmm_user_support/documentation/uhb/node105.html#uhb:par:other
>>
>> Let me know if this is what you were after.
>>
>> Regards,
>>
>> Ignacio de la Calle
>> XMM-Newton SOC
>>
>> ================================================================================================
>> This message and any attachments are intended for the use of the
addressee or addressees only. The unauthorised disclosure,
>>
>> use, dissemination or copying (either in whole or in part) of its
content is not permitted. If you received this message in
>>
>> error, please notify the sender and delete it from your system. Emails
can be altered and their integrity cannot be guaranteed by
>>
>> the sender.
>>
>> Please consider the environment before printing this email.
>> =================================================================================================
>>
>>
>>
>



Reply 2

Resend
From: Ignacio de la Calle <xmmhelp@sciops.esa.int>
To: dbh@physast.uga.edu
Subject: Re: Detection of anomalous chips by mos_back (PR#47647)
Date: Wed Apr 27 08:47:26 2011
Dave Dave,

The ESAS developers have told me that ESAS, as it is now, does not make use
emtaglenoise, it uses its own method. They are looking into making it the
default for ESAS, for consistency, in future releases.

This table might be of use to you: 

http://www.star.le.ac.uk/~amr30/BG/BGTable.html

Here are listed all the know factors that contribute to the background.
For example, you can see in 'Spatial - Structure?' / 'Electronic Noise', 
that,

(3) MOS1 CCDs 4 & 5, MOS2 CCDs 2 & 5 - unusual in- & out-FOV
differences (esp.
MOS1 CCD4) and spatial inhomogeneities. (4) MOS1 CCDs 2 & 5. (5) (6).
Lower-level ~persistent low-E enhancement in MOS1 CCD2

This table also contains some useful links to documentation. 

Also, in the following page, you can find the presentations given at
the yearly Background Working Group meetings where these things are
discussed:

http://www2.le.ac.uk/departments/physics/research/src/Missions/xmm-newton/technical/bg-meetings#bgmeetings

in particular, the following presentation,

http://www2.le.ac.uk/departments/physics/research/src/Missions/xmm-newton/technical/mallorca-2009-04/mallorca-rel.ppt

contains information on noisy MOS CCDs.

I hope this helps.

Thanks,

Ignacio de la Calle
XMM-Newton SOC

> 
> It turns out that emtaglenoise does not entirely do what I wanted. I
> am analyzing a large number of XMM observations, and am finding many
> observations for which mos_back aborts due to anomalous chips, which
> were not identified as much by emtaglenoise.
> 
> For example, in obs. 0404966301, MOS1-5 is identified as anomalous by
> emtaglenoise. However, mos_back aborts with the following message:
> 
>  CCD in an anomalous state - noappropriate data
>  Rerun analysis excluding instrument: MOS 1   CCD # 4
> 
> indicating that MOS1-4 is also anomalous.
> 
> What is the method used by mos_back to identify anomalous chips? Is it
> at all possible to use this method before one starts (i.e., without
> having to wait for mos-spectra to run, and then for mos_back to run
> and abort)?
> 
> Thanks,
> 
> Dave
> 
> On Mon, Apr 4, 2011 at 10:24, David Henley <dbh@physast.uga.edu>
wrote:
>> Dear Ignacio,
>>
>> Thank you - emtaglenoise is just what I'm looking for.
>>
>> Many thanks,
>>
>> Dave
>>
>>
>> On Mon, Apr 4, 2011 at 08:09, Ignacio de la Calle
>> <xmmhelp@sciops.esa.int> wrote:
>>> Dear David,
>>>
>>> Have a look at the following SAS task, it might be what you are
>>> looking for:
>>>
>>> http://xmm.esac.esa.int/sas/current/doc/emtaglenoise/index.html
>>>
>>> You can have some additional information at:
>>>
>>> http://xmm.esac.esa.int/external/xmm_user_support/documentation/uhb/node105.html#uhb:par:other
>>>
>>> Let me know if this is what you were after.
>>>
>>> Regards,
>>>
>>> Ignacio de la Calle
>>> XMM-Newton SOC
>>>
>>> ================================================================================================
>>> This message and any attachments are intended for the use of the
addressee
or
> addressees only. The unauthorised disclosure,
>>>
>>> use, dissemination or copying (either in whole or in part) of its
content
is
> not permitted. If you received this message in
>>>
>>> error, please notify the sender and delete it from your system.
Emails can
be
> altered and their integrity cannot be guaranteed by
>>>
>>> the sender.
>>>
>>> Please consider the environment before printing this email.
>>> =================================================================================================
>>>
>>>
>>>
>>
> 
> 

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