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From: dr@star.sr.bham.ac.uk
Subject: Epic timing mode, source region selection
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Date: Mon, 15 Dec 2003 16:56:26 GMT
From: dr@star.sr.bham.ac.uk
To: xmmhelp@xmm.vilspa.esa.es
CC: dr@star.sr.bham.ac.uk
Subject: Epic timing mode, source region selection
Full_Name: Dan Reed
Submission from: (NULL) (147.188.32.208)


Hi

I have MOS1 timing mode data of a bright Xray binary. Ive done my research and
understand that in timing mode the collection region of the central CCD is 100
pixels in width and 600 pixels in length. Extracting a region with imaging mode
data was easy but how do I do it in timing mode as there is only one spatial
coordinate (RAWX). All I need to do is cut out RAWY = 1-100 and RAWY = 500-600
as there are some faint sources directly above and below the source I am examing
on the central CCD. Could you please advise.

Also when using fv to look at the table of data in the timing event list, all of
the RAWX values are around 300. Am I right in thinking that although the RAWX
axis is 100 pixels in length, the pixels are actually labelled from 250 - 350
(being the centre of a 600 pixel long dimension)?

Cheers

Dan Reed


Reply 1

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From: Pedro M. Rodriguez Pascual <xmmhelp@xmm.vilspa.esa.es>
To: dr@star.sr.bham.ac.uk
Subject: Re: Epic timing mode, source region selection (PR#9720)
Date: Tue Dec 16 10:49:52 2003
Hello Dan,

The collection region for MOS1 in timing mode is a window of 100x100 pixels (see
a description of the MOS operation modes in
http://xmm.vilspa.esa.es/external/xmm_science/1st_results/ps/xmm47.ps.gz ),
though the spatial information in the RAWY direction is COMPLETELY lost after
the 100x100 window is compressed to a single row.

Therefore, source and background regions for timing mode should be defined on
the one single spatial direction: RAWX. 

The RAWY values would not be present in the filtered events file generated with
SAS5.4.1. Note that the "In timing mode, the Y axis does not carry any spatial
information, but is a measure of time, with roll-over of 1024 time-units" (see
http://xmm.vilspa.esa.es/external/xmm_user_support/documentation/uhb/node28.html#2640)

Hope this will help you; do not hesitate to contact us if further clarifications
are needed.

Sincerely, 

Pedro

> 
> I have MOS1 timing mode data of a bright Xray binary. Ive done my research
and
> understand that in timing mode the collection region of the central CCD is
100
> pixels in width and 600 pixels in length. Extracting a region with imaging
mode
> data was easy but how do I do it in timing mode as there is only one
spatial
> coordinate (RAWX). All I need to do is cut out RAWY = 1-100 and RAWY =
500-600
> as there are some faint sources directly above and below the source I am
examing
> on the central CCD. Could you please advise.
> 
> Also when using fv to look at the table of data in the timing event list,
all
of
> the RAWX values are around 300. Am I right in thinking that although the
RAWX
> axis is 100 pixels in length, the pixels are actually labelled from 250 -
350
> (being the centre of a 600 pixel long dimension)?
> 
> Cheers
> 
> Dan Reed
> 
> 

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