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From: ravasio@merate.mi.astro.it
Subject: PN-MOS calibration
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Notification:


Date: Thu, 13 Feb 2003 12:15:40 GMT
From: ravasio@merate.mi.astro.it
To: xmmhelp@xmm.vilspa.esa.es
Subject: PN-MOS calibration
Name: marcello ravasio

Email_Address: ravasio@merate.mi.astro.it

Topic: xmmselect/evselect

Other_Topic: 

Usage_Mode: command line

SAS_Release: xmmsas_20030110_1802 - aka 5.4.1

Task_Version: 

Type: report a nuisance

Title: PN-MOS calibration

Description: I'm trying to reduce en EPIC observation(0136540701) starting from
PPS data, but the PN spectrum i obtain is always softer than that of the MOS. To
avoid pile up i extracted the spectra from annuli but using different extraction
radii i always get the same behaviour. The difference in spectral index lead
also to great differencies also in the integrated fluxes, as large as 60-70%. I
followed strictly the users' guide published in 11/02. The source is very strong
(F(2-10)=2E-10) and hard (G=2). I generate rmf and arf files on my pc using the
tasks
rmfset and arfset

Operating_System: RedHat 7.x

Other_Operating_System: 

Instrument: 

Data_Type: imaging

Observation_Identifier: 0537_0136540701

Exposure_Identifier: 

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Reply 1

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From: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
To: ravasio@merate.mi.astro.it
Subject: Re: PN-MOS calibration (PR#8077)
Date: Thu Feb 13 15:39:11 2003
Dear Marcello, 

Your problem is currently under investigation by the 
EPIC calibration experts. They expect to have an answer later
next week. I will keep you informed 

Hope this delay is acceptable for you as the problem needs
deep investigation.

With best regards
Maria

Maria Santos-Lleo, 
XMM-Newton SOC 
User Support Group


Followup 1

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Date: Thu, 27 Feb 2003 15:07:21 +0100
From: Marcello Ravasio <ravasio@merate.mi.astro.it>
To: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
Subject: Re: PN-MOS calibration (PR#8077)
Dear Maria
I'm writing you because I met another problem while reducing RGS data of 
the same observation I wrote you about last time.
(0136540701, revolution 537)
I downloaded both ODF & PPS: RGS1 observation was splitted into 5 
exposures and RGS2 in 3.
I tried to rerun rgsproc on the first exposure from the pps directory as:

gsproc withinstexpids=true instexpids=R1S001 orders='1 2'  


but I got this response:

 instrumentId, RGS1: 8 8
 instExpIdStr:R1S001
 before fillOutputSrcList
   newListSrcData(1)%decDeg:   0.0000000000000000E+000
   >>before addProposalSrc
   >>  newListSrcData(1)%decDeg:   -9.9900000000000000E+02
 proposalInfo%targetRa, proposalInfo%targetDec   1.6611379199999999E+02  
38.2088333000000020
   >>before addOnaxisSrc
   >>  newListSrcData(1)%decDeg:   38.2088333000000020
 before writeToDataSet
   newListSrcData(1)%decDeg:   38.2088333000000020
** rgsproc::rgssources: warning (badPrimeRate), The prime source 
(INDEX=1) has a RATE value of <= zero. Confusion values cannot be 
calculated.
** rgsproc::rgsframes: error (UnsuccessfulFit), No satisfactory fit 
found after removing 90% of the data points

I tried to rerun rgsproc also from the odf directory simply typiing 
"rgsproc" but i got the same answer.
What does it means? Are the data unreliable? Can I do something on them?
Excuse very much for disturbing you again
Thank you very much for your attention
Marcello Ravasio

PS: have you already looked at the problem i told you about PN-MOS? 

 

Maria Santos-Lleo wrote:

>Dear Marcello, 
>
>Your problem is currently under investigation by the 
>EPIC calibration experts. They expect to have an answer later
>next week. I will keep you informed 
>
>Hope this delay is acceptable for you as the problem needs
>deep investigation.
>
>With best regards
>Maria
>
>Maria Santos-Lleo, 
>XMM-Newton SOC 
>User Support Group
>
>




Reply 2

Resend
From: Matteo Guainazzi <xmmhelp@xmm.vilspa.esa.es>
To: ravasio@merate.mi.astro.it
Subject: Re: PN-MOS calibration (PR#8077)
Date: Fri Feb 28 08:49:09 2003
Dear Marcello,

 the problem you reported has been independently observed by other
scientists analyzing EPIC data. Investigation is still ongoing, and
a full report on the results of this investigation will be available
in the next XMM-NEWS bullettin.

 Briefly: you have probably correctly applied the procedure, as
described in the SAS documentation. It seems, however, that the
PSF correction for the photon loss can still be improved. The
current implementation may indeed yield a systematic difference
between the spectral shapes observed in different EPIC cameras.

 Before an alternative recipe and/or workaround is developed, let
me remind you that the usage of single events may mitigate pile-up
problems. For more information, you are referred to the next
XMM-NEWS bullettin, which will be circulated in short time.

 Regards,

 Matteo Guainazzi
 XMM-Newton Science Operation Center
 User Support Group

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