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From: fangt@astron.berkeley.edu
Subject: pn rmf
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1 followups: 1

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Date: Wed, 4 Feb 2004 19:42:46 GMT
From: fangt@astron.berkeley.edu
To: xmmhelp@xmm.vilspa.esa.es
CC: fangt@astron.berkeley.edu
Subject: pn rmf
Full_Name: Taotao Fang
Submission from: (NULL) (128.32.92.250)


Hi,

When analyzing pn data of 0092850201 with SAS5.4, I found a quite strange
problem. If I use the new calibration data to create a rmf (e.g., use rmfgen), I
can't get a good fit of the spectrum in XSPEC with this rmf. It is the same if I
use the canned rmf "epn_ff20_sdY9.rmf". However, I analyzed this data before,
with SAS 5.3 or early, and I didn't have such a problem, and if I use the old
canned rmf, say, " epn_ff20_sdY9_medium.rmf" from the ftp site
ftp://legacy.gsfc.nasa.gov/caldb/data/xmm/epic/pn/cpf/responses/20020430/medium/,
I also got quite good fit.

So, I guess my questions is: is there any difference in rmfgen between the odl
SAS version and the new one, that could cause this problem?

Many thanks!
Taotao


Reply 1

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From: Norbert Schartel <xmmhelp@xmm.vilspa.esa.es>
To: fangt@astron.berkeley.edu
Subject: Re: pn rmf (PR#10116)
Date: Thu Feb  5 15:32:06 2004
Dear Taotao,

the calibration of XMM-Newton and all its
instruments is permanently improved. If
there are major changes then new scanned
rmfs are generated. Therefore, I am not
surprised that you get different results.

Our general recommendation is that for
scientific analysis the latest available
calibration (either scanned or new generated
rmfs) should be used.

With best regards
Norbert


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Date: Thu, 5 Feb 2004 14:05:07 -0800 (PST)
From: Taotao Fang <fangt@astron.Berkeley.EDU>
To: Norbert Schartel <xmmhelp@xmm.vilspa.esa.es>
Subject: Re: pn rmf (PR#10116)
Dear Norbert,

Yes, I understand your point. My question is that I would like to know
what the difference is, and I can't find a file which documented it.
Another related question is: the observation was done on
2001-04-28T10:40:26, should I use old rmf or the new one?

Thanks,
Taotao

On Thu, 5 Feb 2004, Norbert Schartel wrote:

> Dear Taotao,
>
> the calibration of XMM-Newton and all its
> instruments is permanently improved. If
> there are major changes then new scanned
> rmfs are generated. Therefore, I am not
> surprised that you get different results.
>
> Our general recommendation is that for
> scientific analysis the latest available
> calibration (either scanned or new generated
> rmfs) should be used.
>
> With best regards
> Norbert
>
>



Reply 2

Resend
From: Norbert Schartel <xmmhelp@xmm.vilspa.esa.es>
To: fangt@astron.Berkeley.EDU
Subject: Re: pn rmf (PR#10116)
Date: Fri Feb  6 09:15:19 2004
Dear Taotao,

all changes are documented. Please, look at
http://xmm.vilspa.esa.es/external/xmm_sw_cal/calib/rel_notes/index.shtml
http://xmm.vilspa.esa.es/sas/documentation/releasenotes/
http://xmm.vilspa.esa.es/external/xmm_sw_cal/sas_sci_val/index.shtml

Please, use always the new one (calibration
files). (Many improvements in the calibration
can be and are applied for older data).

With best regards
Norbert

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