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From: Andrea Martocchia <martok@quasar.u-strasbg.fr>
Subject: Re: still on odd spectra from observations affected by telemetry
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Date: Thu, 25 Nov 2004 10:42:16 +0100 (CET)
From: Andrea Martocchia <martok@quasar.u-strasbg.fr>
Subject: Re: still on odd spectra from observations affected by telemetry
To: "Pedro M. Rodriguez Pascual" <xmmhelp@xmm.vilspa.esa.es>
Cc: Andrea Martocchia <martok@quasar.u-strasbg.fr>
Thank you Pedro for the prompt answer. 
What actually bothers me is not the strong flux drop (spectral shape) at 
the lowest energies, but rather the fact that most channels around 
and below 1 keV show huge error bars. I may perhaps have a look at the 2nd 
order spectra.
Thank you again,
Andrea Martocchia


On Thu, 25 Nov 2004, Pedro M. Rodriguez Pascual wrote:

> Dear Andrea, 
> 
> I do not think events below 1keV are bad, but simply noise since photons
from
> the source are heavily extinguised to the a fairly large absorbing column
> density.
> 
> Sincerely, 
> 
> Pedro
> 
> > 
> > 
> > Dear XMM-helpdesk colleagues,
> > 
> > the observation 0144090201 was performed in difficult telemetry 
> > conditions, due to the high flux of the source GRS1915+105. PN was set
in 
> > Burst Mode, MOS in Timing. 
> > Is it possible that these difficulties with telemetry are also the
reason 
> > for the RGS1 and RGS2 to yield virtually all bad events below \sim 1
keV ?
> > I am attaching here a plot of RGS data, for illustration. 
> > 
> > Thanks in advance,
> > Andrea Martocchia
> > 
> 


Reply 1

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From: Pedro M. Rodriguez Pascual <xmmhelp@xmm.vilspa.esa.es>
To: martok@quasar.u-strasbg.fr
Subject: Re: still on odd spectra from observations affected by telemetry (PR#16644)
Date: Thu Nov 25 11:32:52 2004
Hello again, 

The huge relative error bars are very likely due to the small number of counts
in low energy bins. 

Pedro

> 
> Thank you Pedro for the prompt answer. 
> What actually bothers me is not the strong flux drop (spectral shape) at 
> the lowest energies, but rather the fact that most channels around 
> and below 1 keV show huge error bars. I may perhaps have a look at the 2nd

> order spectra.
> Thank you again,
> Andrea Martocchia
> 
> 
> On Thu, 25 Nov 2004, Pedro M. Rodriguez Pascual wrote:
> 
>> Dear Andrea, 
>> 
>> I do not think events below 1keV are bad, but simply noise since
photons
from
>> the source are heavily extinguised to the a fairly large absorbing
column
>> density.
>> 
>> Sincerely, 
>> 
>> Pedro
>> 
>> > 
>> > 
>> > Dear XMM-helpdesk colleagues,
>> > 
>> > the observation 0144090201 was performed in difficult telemetry 
>> > conditions, due to the high flux of the source GRS1915+105. PN was
set in 
>> > Burst Mode, MOS in Timing. 
>> > Is it possible that these difficulties with telemetry are also the
reason 
>> > for the RGS1 and RGS2 to yield virtually all bad events below \sim
1 keV ?
>> > I am attaching here a plot of RGS data, for illustration. 
>> > 
>> > Thanks in advance,
>> > Andrea Martocchia
>> > 
>> 
> 
> 

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