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From: jonmm@umich.edu
Subject: background
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Date: Wed, 12 Jun 2019 16:51:47 +0200
From: jonmm@umich.edu
To: xmmhelp@sciops.esa.int
Subject: background
Full_Name: Jon Miller
Submission from: (NULL) (193.147.152.102)


I am trying to analyze ObsID 0301151101.

The background is very high, but it does not seem to be due to soft proton
flaring.

The overall count rate is fairly smooth.

I cannot understand the source of the background, of if it can be eliminated by
filtering.

I am hopeful that there is an obvious solution and that I have just missed it.

Any insights or remarks would be quite valuable.

Thank you for your help.  

- Jon 


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From: Lucia Ballo <xmmhelp@sciops.esa.int>
To: jonmm@umich.edu
Subject: Re: background (PR#85355)
Date: Fri Jun 14 18:07:02 2019
Dear Jon,

According with our observation log, the whole ObsID 0301151101 was affected 
by high radiation. You may want to look at the radiation monitor archive:

https://www.cosmos.esa.int/web/xmm-newton/radmon-archive

where you can find the 48 hour Postcript files containing the Radiation Monitor

data for the revolution you are interested in, rev. 1077.
Actually, the PN experienced Full Scientific Buffer all the long observation, 
and the X-ray exposures were stopped before the planned end of the observation 
due to radiation alert.

I was looking at the background lightcurve that is part of the PPS products, 
and it has the typical aspect of high radiation background.


In this case, the only indication is to adopt a quite high threshold in counts 
for filtering the event files (as done by the pipeline), taking into account 
that your scientific products will be still affected by high background, even 
after the cleaning.

Please, let me know if you are referring to something else that you see in the 
data and that cannot be explained by this high radiation period affecting the 
whole observation.


With kind regards,
Lucia
--
   Dr Lucia Ballo 
   XMM-Newton Science Operations Centre
   Community Support and Scientific Planning Team

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