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From: Bing Zhang <bzhang@astro.psu.edu>
Subject: PSR B0943+10 XMM Second Observation (fwd)
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Date: Tue, 6 Jan 2004 17:27:08 -0500 (EST)
From: Bing Zhang <bzhang@astro.psu.edu>
To: XMM-Newton SOC <XMMHELP@xmm.vilspa.esa.es>
Subject: PSR B0943+10 XMM Second Observation (fwd)
  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.
  Send mail to mime@docserver.cac.washington.edu for more info.

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Dear helpdesk,

We recently received data on the second part of the observation of PSR
B0943+10 with XMM (Observation Id 0150970301). The PN image of the field
shows some streaks in the readout direction all over the detector (This is
the pipeline processed product).

Attached is a postscript image of the PN data showing the streaks all over
the detector (top) and a zoomed view of the central region (bottom).  Could
you please help us figure out what might be wrong with this data set? It
will be great if you may reprocess the data somewhat more and forward us
the new data set.

The observational information is:

> XMM-Newton Observation Id : 0150970301
> XMM-Newton pipeline processing report:
>
> Target name          : PSR B0943+10
> Observer             : Dr Bing Zhang
> Observation date     : Dec 2 2003 10:01PM
> Observation duration : 23911
> Processing date      : Dec 16 2003 9:40AM

Thank you very much!

Best regards,
Bing

**************************************************************************
Bing Zhang                         | Tel: (814)865-0261 (O)
525 Davey Laboratory               |      (814)237-7280 (H)
Astronomy & Astrophysics Department| Fax: (814)863-3399
Pennsylvania State University      | Email: bzhang@astro.psu.edu
University Park, PA 16802, USA     | http://www.astro.psu.edu/users/bzhang
**************************************************************************


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Reply 1

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: bzhang@astro.psu.edu
Subject: Re: PSR B0943+10 XMM Second Observation (fwd) (PR#9827)
Date: Wed Jan  7 12:00:46 2004
Dear Bing,

according to our obs log the pn exposure in observation 0150970301 was
strongly affected by high energy particles during the offset calculation 
resulting in locally varying low-energy response.

The way to get rid of this streaks is to restrict your analysis
to energies above ~300 eV, e.g. by using the selection expression
(PI>=300) for the image and spectra production.

Cheers,
  Matthias

Matthias Ehle 
XMM-Newton SOC 
User Support Group

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