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From: gtbr@mssl.ucl.ac.uk
Subject: gti files
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Notification:


Date: Thu, 16 Oct 2003 13:07:16 GMT
From: gtbr@mssl.ucl.ac.uk
To: xmmhelp@xmm.vilspa.esa.es
CC: gtbr@mssl.ucl.ac.uk
Subject: gti files
Full_Name: gavin ramsay
Submission from: (NULL) (128.40.72.254)


hi,
in one set of observations i find that there are a number of 
gaps introduced into the light curve. this is reflected in the
gti info in the cleaned event file. is there an easy way 
to ensure that there are no gaps in the data? i take it that 
there are gaps due to high proton background?

thanks
gavin 


Reply 1

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: gtbr@mssl.ucl.ac.uk
Subject: Re: gti files (PR#9327)
Date: Mon Oct 20 12:05:57 2003
Dear Gavin,

you might want to check the Obs log browser at 

http://xmm.vilspa.esa.es/obs-public/obs_view.tcl

to see if the instrument controllers made any comments
on the background during your observations.

Otherwise, please, let us know the Obs.Id. of your data
for further investigations.

Anyhow, if GTIs have been introduced, the exposure time is
adjusted correspondingly such that further SAS processing
can take care of this.

Cheers,
 Matthias

Matthias Ehle 
XMM-Newton SOC 
User Support Group


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From: Gavin Ramsay <gtbr@mssl.ucl.ac.uk>
Subject: Re: gti files (PR#9327)
To: xmmhelp@xmm.vilspa.esa.es (Matthias Ehle)
Date: Tue, 28 Oct 2003 13:07:26 +0000 (GMT)
Matthias

thanks for the email.

> you might want to check the Obs log browser at 
> 
> http://xmm.vilspa.esa.es/obs-public/obs_view.tcl
> 
> to see if the instrument controllers made any comments
> on the background during your observations.
> 
> Otherwise, please, let us know the Obs.Id. of your data
> for further investigations.
> 
> Anyhow, if GTIs have been introduced, the exposure time is
> adjusted correspondingly such that further SAS processing
> can take care of this.

there are no comments about the background. for the analysis we would 
prefer no data gaps - which the gti is including. the 
obs id is 0152530101

if we could work out a way of not including the gti gaps that would be great.

regards

Gavin

-------------------------------------------------------------------------------
Gavin Ramsay                      E-Mail: gtbr@mssl.ucl.ac.uk
Mullard Space Science Lab         Phone (switchboard): +44 (0)1483 274111
University College London         Phone (office)     : +44 (0)1483 204134
Holmbury St.Mary, Dorking         Fax                : +44 (0)1483 278312
Surrey, RH5 6NT, UK               http://www.mssl.ucl.ac.uk/~gtbr
-------------------------------------------------------------------------------



Reply 2

Resend
From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: gtbr@mssl.ucl.ac.uk
Subject: Re: gti files (PR#9327)
Date: Wed Oct 29 09:38:32 2003
Hi Gavin,

you wrote:
> there are no comments about the background. for the analysis we would 
> prefer no data gaps - which the gti is including. the 
> obs id is 0152530101
> 
> if we could work out a way of not including the gti gaps that would be
great.

I had a look at this ObsID: after reprocessing the pn data I see from the
rate curve that there are many spikes due to high background radiation
in your data. The times between these flares show count rates (if e.g.
restricting to energies above 10 keV) of about 1.5 cts/s.
So there are *no* data gaps between the flares.

It now depends on the science you want to do with your observation: for 
a spectrum I would throw away all the periods affected by high background
but to analyse a light curve, I recommend to follow the advice given in 
helpdesk question 9382.

Cheers,
  Matthias

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