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From: Will Clarkson <wic@astro.soton.ac.uk>
Subject: Re: EPIC-PN/Timing: pixel weighting during collapse to 1D given CTI
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Date: Tue, 30 Sep 2003 17:03:49 +0100 (BST)
From: Will Clarkson <wic@astro.soton.ac.uk>
To: "Pedro M. Rodriguez Pascual" <xmmhelp@xmm.vilspa.esa.es>
Subject: Re: EPIC-PN/Timing: pixel weighting during collapse to 1D given CTI
Dear Pedro,

We were under the impression that the Charge Transfer Inefficiency (CTI)
would cause different pixels on the 2D region to be weighted differently
during the collapse to 1D for readout. I have recently spoken to Martin
Turner, and this effect is calibrated and accounted for, so if pileup is
not a serious issue and the up-to-date versions of arfgen etc. are used
then the photon energies should be correct. This also answers my third
question (#9080), about the effect on the continuum and spectral flux.

Thanks very much,

Will


On Thu, 4 Sep 2003, Pedro M. Rodriguez Pascual wrote:

> Dear Will,
>
> We have forwarded your question to pn team, but according to our local
experts
> the collapse is made without weighting.
>
> We will contact you as soon as the instrument team replies.
>
> Sincerely,
>
> Pedro
>
> > Full_Name: Will Clarkson
> > Submission from: (NULL) (152.78.0.29)
> >
> >
> > We are attempting to estimate from timing data the flux from an
annular
> region
> > surrounding the point source, which would obviously be affected by
unequal
> > weighting during the collapse from 2D to 1D for timing mode. Are all
pixels
> > weighted equally during this collapse? Is the deviation from uniform
> weighting
> > known at this time?
> >
> > thanks!
> >
> >
>






Reply 1

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From: Norbert Schartel <xmmhelp@xmm.vilspa.esa.es>
To: wic@astro.soton.ac.uk
Subject: Re: EPIC-PN/Timing: pixel weighting during collapse to 1D given CTI 
Date: Wed Oct  1 11:22:14 2003
Dear Will,

thanks for the feeback. I sent a copy to
Pedro.

With best regards
Norbert

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