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From: Divas Sanwal <divas@astro.psu.edu>
Subject: Observing efficiency of XMM (PN and MOS)
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Date: Mon, 29 Aug 2005 15:25:19 -0400
From: Divas Sanwal <divas@astro.psu.edu>
Subject: Observing efficiency of XMM (PN and MOS)
To: xmmhelp@xmm.vilspa.esa.es
Cc: divas@astro.psu.edu
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Hi,

I am interested in knowing the observing efficiency of XMM.  I find =20
on your webpage that, for example, the PN performed SCIENCE =20
OBSERVATIONS over revs 928-1017 about 64.2% of the time outside of =20
the radiation belt.

What I would like to know is the approximate fraction of the time =20
spent on science observations that was lost due to high particle =20
background such that the data were not useful for the science proposed.

Thanks,
Divas

Divas Sanwal


=EF=BF=BC=

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class=3D"khtml-block-placeholder"></DIV><DIV>I am interested in
knowing =
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example, the PN performed SCIENCE OBSERVATIONS over revs 928-1017 about =
64.2% of the time outside of the radiation belt.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>What I would like to
know =
is the approximate fraction of the time spent on science observations =
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not useful for the science proposed.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Thanks,</DIV><DIV>Divas</DIV>=
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Sanwal</DIV><DIV><BR
class=3D"khtml-block-placeholder"></DIV><BR =
class=3D"Apple-interchange-newline"></SPAN> =
</DIV><DIV></DIV></DIV></BODY></HTML>=

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Reply 1

Resend
From: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
To: divas@astro.psu.edu
Subject: Re: Observing efficiency of XMM (PN and MOS) (PR#19248)
Date: Wed Aug 31 09:05:32 2005
Dear Divas,

we do not keep records of the data that are not good for science due
to high particle background, this is anyway quite difficult to estimate
because it depends a lot on the scientific goal of the observation, but 
I can ask the Project Scientist who probably has an estimation.
In the quarterly reports in our web page (xmm.vilspa.esa.es) what you can
see is the time when instruments had to be closed for safety of the 
instruments themselves, due to high radiation (red in the graphics).
For PN for the revolutions 928-1017, 7.21% of the Science Windows 
was lost because PN had to be closed due to high radiation (solar 
flare).

Best regards,

Nora
----
Dr. Nora Loiseau
XMM-Newton User Support Group


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Date: Thu, 08 Sep 2005 08:55:22 -0400
From: Divas Sanwal <divas@astro.psu.edu>
Subject: Re: Observing efficiency of XMM (PN and MOS) (PR#19248)
To: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
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Dear Nora,

Sorry for the delay in response.  I would like to know an approximate  
number of the time lost due to high particle background for faint  
diffuse sources (such as clusters) in background limited observations.

I have heard numbers like 25-35 % of data is not useful for such  
observations with XMM and would like a rough estimate.  Could you  
please ask the Project Scientist if these numbers hold any value and  
what would be a reasonable estimate to use.

Thanks for your help.

Best wishes,
Divas


On Aug 31, 2005, at 5:05 AM, Nora Loiseau wrote:

> Dear Divas,
>
> we do not keep records of the data that are not good for science due
> to high particle background, this is anyway quite difficult to  
> estimate
> because it depends a lot on the scientific goal of the observation,  
> but
> I can ask the Project Scientist who probably has an estimation.
> In the quarterly reports in our web page (xmm.vilspa.esa.es) what  
> you can
> see is the time when instruments had to be closed for safety of the
> instruments themselves, due to high radiation (red in the graphics).
> For PN for the revolutions 928-1017, 7.21% of the Science Windows
> was lost because PN had to be closed due to high radiation (solar
> flare).
>
> Best regards,
>
> Nora
> ----
> Dr. Nora Loiseau
> XMM-Newton User Support Group
>

Divas Sanwal




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<HTML><BODY style=3D"word-wrap: break-word; -khtml-nbsp-mode: space; =
-khtml-line-break: after-white-space; ">Dear Nora,<DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Sorry for the delay
in =
response.=A0 I would like to know an approximate number of the time lost =
due to high particle background for faint diffuse sources (such as =
clusters) in background limited observations.=A0=A0</DIV><DIV><BR
=
class=3D"khtml-block-placeholder"></DIV><DIV>I have heard numbers
like =
25-35 % of data is not useful for such observations with XMM and would =
like a rough estimate.=A0 Could you please ask the Project Scientist if =
these numbers hold any value and what would be a reasonable estimate to =
use.</DIV><DIV><BR
class=3D"khtml-block-placeholder"></DIV><DIV>Thanks =
for your help.</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV>Best =
wishes,</DIV><DIV>Divas</DIV><DIV><BR =
class=3D"khtml-block-placeholder"></DIV><DIV><BR><DIV><DIV>On
Aug 31, =
2005, at 5:05 AM, Nora Loiseau wrote:</DIV><BR =
class=3D"Apple-interchange-newline"><BLOCKQUOTE type=3D"cite"><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">Dear Divas,</DIV><DIV style=3D"margin-top: 0px;
=
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; min-height: =
14px; "><BR></DIV><DIV style=3D"margin-top: 0px; margin-right:
0px; =
margin-bottom: 0px; margin-left: 0px; ">we do not keep records of the =
data that are not good for science due</DIV><DIV style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">to high =
particle background, this is anyway quite difficult to =
estimate</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">because it depends a lot on the =
scientific goal of the observation, but<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV
style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">I can =
ask the Project Scientist who probably has an estimation.</DIV><DIV =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px; ">In the quarterly reports in our web page =
(xmm.vilspa.esa.es) what you can</DIV><DIV style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">see is the =
time when instruments had to be closed for safety of the<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV
style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; =
">instruments themselves, due to high radiation (red in the =
graphics).</DIV><DIV style=3D"margin-top: 0px; margin-right: 0px; =
margin-bottom: 0px; margin-left: 0px; ">For PN for the revolutions =
928-1017, 7.21% of the Science Windows<SPAN =
class=3D"Apple-converted-space">=A0</SPAN></DIV><DIV
style=3D"margin-top: =
0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">was lost =
because PN had to be closed due to h

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Reply 2

Resend
From: Norbert Schartel <xmmhelp@xmm.vilspa.esa.es>
To: divas@astro.psu.edu
Subject: Re: Observing efficiency of XMM (PN and MOS) (PR#19248)
Date: Sat Sep 10 09:49:52 2005
Dear Divas,

I do not see a realistic way to estimate the 
numbers you are looking for. The main reasons 
is that the acceptable background radiation 
level for each observation depends on the source 
properties (flux, spectra, extent, etc.),
on the background spectrum and can in addition 
depend on the scientific question.

A major difficulty is that many scientists are
performing a simple background count-rate 
screening and are not performing a signal-to-noise 
optimization technique which is significantly 
more appropriate. According to my personal experiences 
the "rejected" time is about half if such 
optimization techniques are utilized.

We offer the possibility that proposers flag 
observations which are re-proposed as they
were lost due to high background radiation.
Also I do not have the exact number, I estimate
that these are below 5% of the performed observations.  

With best regards
Norbert Schartel
(XMM-Newton Project Scientist)

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