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From: Peres Giovanni <peres@oapa23.astropa.unipa.it>
Subject: problems with a GTO observation
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Date: Tue, 04 Nov 2003 13:01:23 +0100
From: Peres Giovanni <peres@oapa23.astropa.unipa.it>
To: xmmhelp@xmm.vilspa.esa.es
CC: peres <peres@oapa23.astropa.unipa.it>,
Subject: problems with a GTO observation
Dear Sirs,
I am writing you for a problem encountered in the analysis of a
GTO observation, namely the observation of open star cluster IC 2391.
The relevant observation nr. is 0112420101 (revolution 357).

The original proposal asked for medium filters for PN, for MOS1 and for
MOS2.
However the header of the observation quotes THICK for the filters of
the MOS detectors.
What is even more puzzling, when we take the count ratio for the coronal
sources in the field of view we find a count ratio (PN/MOS counts) of
3.5-3.6 consistent with both instruments having medium filters. Please
note that such a ratio has been checked over 8 sources in the field, it
is well know to be very close to the above value for stellar sources,
with very small variance and it is significantly different from 4.6, the
ratio
expected for PN/MOS counts if MOS had the thick filter and PN the medium
one.

Considering all the above, can you please be so kind to check again the
features of the
above observation and, in particular, which filters were used for PN and
MOS's?

Thank you in advance,
Giovanni Peres

--
Giovanni Peres; Dipt. di Scienze Fisiche ed Astronomiche,
Sez. di Astronomia; Piazza del Parlamento 1; I-90134 Palermo; Italy
Tel. (39)(091) 233236 (direct) or (39)(091) 233111; fax +39-091-233444
e-mail: peres@oapa.astropa.unipa.it  http://www.astropa.unipa.it/~peres



Reply 1

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From: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
To: peres@oapa23.astropa.unipa.it
Subject: Re: problems with a GTO observation (PR#9431)
Date: Tue Nov  4 16:45:48 2003
Dear Giovanni

I have checked all versions of proposal 011242, observation 01 (IC 2391)
and they all have both MOS cameras with THICK filters, even in the 
original proposal. I have also checked the observation log, and it is
also consistent with both MOSes with thick filter as requested and as 
in the header of the pipeline products. 

Therefore, everything points towards the observation having being 
performed with thick filter in MOS and medium in pn.

I have no explanation, however, for the mentioned discrepancy between the 
expected and measured PN/MOS count ratios. I would suggest to 
check whether the MOS and/or PN exposure times are correct in the 
files, or whether the relative high Hydrogen column density 
in the line of sight to the cluster can change the spectra of 
the coronal sources (and therefore the PN/MOS ratio) in the 
way you see. 

Please let us know if the problem remains. 

With best regards

Maria



Followup 1

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Date: Wed, 5 Nov 2003 12:53:34 +0100 (MET)
From: Peres Giovanni <peres@oapa23.astropa.unipa.it>
To: peres@oapa23.astropa.unipa.it, xmmhelp@xmm.vilspa.esa.es
Subject: Re: problems with a GTO observation (PR#9431)
Cc: giusi@graal.astropa.unipa.it, marino@graal.astropa.unipa.it
Dear Maria,
thank you for your prompt, professional and kind answer.
Let me go back to the data and do a few more checks. In particular I have
a copy of the proposal where it is asked to use medium filters for MOS.

Can you send me, for documentation, your copy of the proposal, since it is
different from the copy I have (I was the originator of such a proposal, ad
as you can imagine)?

Best wishes,
Giovanni Peres



Reply 2

Resend
From: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
To: peres@oapa23.astropa.unipa.it
Subject: Re: problems with a GTO observation (PR#9431)
Date: Thu Nov  6 15:03:26 2003
Dear Giovanni,

There is no problem in sending you a copy of the original proposal. 
The quickest for me is, as I am doing now, to forward you the 
email sent back to the PI at the time of submission. This e-mail 
was forwarded to the XMM Project Scientist, Fred Jansen, following 
his request to all GT PIs to do so. If you have recently submitted
XMM proposals, you will realize that the e-mail content is quite
different now, but all the observation parameters are included 
in the old mails. 

In case you want to have a postscript file generated from the 1st 
proposal version in our archive, this is also possible because
we keep all proposal versions. This is a bit more complicated,
but not too much, so just let me know and I will be happy to
do it. 

Please do not hesitate to contact us if further problems arrive. 

With kind regards

Maria

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---------- Forwarded message ----------
Date: Thu, 15 Jul 1999 13:45:59 GMT
From: Operational User <xmmops@xara.ops.esa.int>
Subject: XMM proposal received

User ID.=2119
Your proposal numbered 11242 for the XMM mission has been logged as follows:

Title=EPIC Observation of the Open Cluster IC 2391
Abstract=
GT-The cluster IC 2391 is an ideal target to study the decline of X-ray flux
wit
h age, the existence of a related softening of the X-ray spectrum with age, and

of a saturation level of the X-ray surface flux: it is so young (age ~30 Myr)
th
at solar-type members have just arrived on the main-sequence, they have not yet

spun down, and they are very active. Being significantly younger than other
star
 clusters the observation of IC 2391 will provide data crucial to understand
the
 evolution of stellar coronae spectra. The high quality XMM spectra will likely

reveal a thermal coronal structure more complex than that obtained with other
in
struments so far. IC 2391 has been the target of surveys and detailed optical
an
d photometric studies in the optical band.
Target Of Opportunity=F
Associated Proposals=
Optical follow-up performed by=SSC
Pilot success/fail criteria=
Proposal Type=GO
Proposal Category=A
Proposal Status=ENTRY
GO=1
Name=Prof Giovanni Peres
Institute=DSFA University of Palermo
Address=Piazza del Parlamento 1

Palermo

90134
ITALY
Email=peres@oapa.astropa.unipa.it

Phone=+39 +091 233 236
Fax=+39 +091 233 444
GO=2
Name=Dr Marco Barbera
Institute=Oss. Astronomico di Palermo
Address=Piazza del Parlamento 1

Palermo

90134
ITALY
Email=barbera@oapa.astropa.unipa.it

Phone=
Fax=
GO=3
Name=Dr Francesco Damiani
Institute=Oss. Astronomico di Palermo
Address=Piazza del Parlamento 1

Palermo

90134
ITALY
Email=damiani@oapa.astropa.unipa.it

Phone=
Fax=
GO=4
Name=Dr Antonio Maggio
Institute=Oss. Astronomico di Palermo
Address=Piazza del Parlamento 1

Palermo

90134
ITALY
Email=maggio@oapa.astropa.unipa.it

Phone=
Fax=
GO=5
Name=Dr Giuseppina Micela
Institute=Oss. Astronomico di Palermo
Address=Piazza del Parlamento 1

Palermo

90134
ITALY
Email=giusi@oapa.astropa.unipa.it

Phone=
Fax=

------------------------------------------------------------------------------

Observation=1
Target Name=IC 2391
Observation Type=Non-Fixed
Target  RA= 08  41  59.00 (J2000)
Target DEC=-53  00  35.0 (J2000)
Observation Duration=45000
Alternate Names=
Target Category=A
Boresight  RA= 08  41  59.00 (J2000)
Boresight DEC=-53  00  35.0 (J2000)
Prime Instrument=E3
Upper Position Angle Constraint=
Lower Position Angle Constraint=
Source Extent= (deg)
Variable Source=F
Source X-ray Flux= (ergs/sqcm/s)
Lower Flux Band Limit=
Upper Flux Band Limit=
Visible Magnitude=
X-Ray Spectral Model=
Determining Model Parameter=
Hydrogen Column Density=
SOC Enhance Request=N
Instance=1
Earliest Start 

Message of length 5941 truncated

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