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From: audard@astro.phys.ethz.ch
Subject: OM fast chain: region files
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Date: Fri, 7 Jun 2002 15:19:33 GMT
From: audard@astro.phys.ethz.ch
To: xmmhelp@xmm.vilspa.esa.es
CC: audard@astro.phys.ethz.ch
Subject: OM fast chain: region files
Full_Name: Marc Audard
Submission from: (NULL) (129.132.63.74)


Hi,

My source is very bright in the OM fast mode, and appears to be
near the edge of the inner CCD. The region file shows me that the
region selected by omfchain extends outside the inner CCD.
Is this corrected in the OM tasks? Is there an ASCII file of
the BKG region? Or is it simply the region outside the source region?

Marc

Reply 1

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From: Eva Verdugo <xmmhelp@xmm.vilspa.esa.es>
To: audard@astro.phys.ethz.ch
Subject: Re: OM fast chain: region files (PR#5435)
Date: Fri Jun 14 11:39:15 2002
Dear Marc,

we are studying your problems with omfchain and
we will answer to you as soon as possible.

Thanks for your messages.
Best regards,

Eva Verdugo
XMM-Newton User Support Group


Reply 2

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From: Eva Verdugo <xmmhelp@xmm.vilspa.esa.es>
To: audard@astro.phys.ethz.ch
Subject: Re: OM fast chain: region files (PR#5435)
Date: Fri Jun 14 14:46:54 2002
Dear Marc,

> My source is very bright in the OM fast mode, and appears to be
> near the edge of the inner CCD.
Just a minor comment here: the OM CCD is only one. In fast mode
you have a window in the CCD of 22 x 23 pixels (the Fast window).
This window is processed by SAS (omfchain) independently of other 
windows. 

We have checked your data and certainly the bright source is
partially out of the Fast window.

> The region file shows me that the region selected by omfchain 
> extends outside the inner CCD. Is this corrected in the OM tasks?
In the corresponding OM tasks the PSF is used to reconstruct the
real, whole extension of the source. The accuracy of this process
can be checked by plotting the image (P0049350101OMS006IMAGE_1000.FIT)
and the ASCII file which contains the source extraction circle
(F0049350101OMS006REGION1000.ASC). 

> Is there an ASCII file of the BKG region? Or is it simply the 
> region outside the source region? 
There is not an ASCII file for the background region but a FIT
file (F0049350101OMS006BGDREG1000.FIT) that contains the used BKG
annulus (inner and outer radii). In omfchain the default is an srcradius
of -6 (if it is negative its value will be fixed during the extraction of
source counts) and the inner and outer radii for the background annulus
are 1.2 and 2.5 times the source radius respectively (i.e. 7.2 and 15).
These values can be changed by manually processing using omregion task
(parameters: srcradius, bkginner and bkgouter).

More information can be found at:
http://xmm.vilspa.esa.es/external/xmm_sw_cal/sas_frame.shtml   

Hope it helps.
Best regards,

Eva Verdugo
XMM-Newton User Support Group

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