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From: spravdo@jpl.nasa.gov
Subject: secondary GTI file
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Date: Thu, 15 Jul 2004 15:21:14 GMT
From: spravdo@jpl.nasa.gov
To: xmmhelp@xmm.vilspa.esa.es
CC: spravdo@jpl.nasa.gov
Subject: secondary GTI file
Full_Name: 
Submission from: (NULL) (137.79.94.133)


What is a good value to use for the count rate limit for MOS 1, MOS 2, or EPIC.

I have a light curve from a recent observation (can send .ps file on request)
that
appears to have high count rates (non-source) in much of the time. Is this
typical?
I already used the filter:

(PATTERN <= 12)&&(PI in [300:12000])&&#XMMEA_EM

Thanks,
-Steve


Reply 1

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: spravdo@jpl.nasa.gov
Subject: Re: secondary GTI file (PR#15482)
Date: Fri Jul 16 08:35:33 2004
Dear Steve,

> What is a good value to use for the count rate limit for MOS 1, MOS 2, or
EPIC.

Please, have a look at the SAS Users' Guide (esp. Section 4.4.3 "Filtering high
background periods") and also have a look at our analysis threads ("Spectral 
analysis of MOS/pn point-like sources" available at
http://xmm.vilspa.esa.es/sas/documentation/threads/ )


> I have a light curve from a recent observation (can send .ps file on
request)
> that
> appears to have high count rates (non-source) in much of the time. Is this
> typical?

You might want to check your ObsId in our Observation log browser
(http://xmm.vilspa.esa.es/external/xmm_obs_info/obs_view_frame.shtml)
to see if the instrument controllers made any statement about high background
during your observation.
 
Generally speaking, it strongly depends on the science you want to perform how 
strict you have to be with the background filtering: e.g. for a detection
experiment you might accept a higher background level than for detailed spectral
analysis of 
weak or extended sources.

Cheers,
  Matthias

 Matthias Ehle 
XMM-Newton User Support Group

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