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From: orio <orio@to.astro.it>
Subject: urgent problem with OM
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Date: Mon, 19 Jan 2004 14:33:25 +0100 (CET)
From: orio <orio@to.astro.it>
To: xmmhelp@xmm.vilspa.esa.es
Subject: urgent problem with OM
  Dear Michel - or other OM expert,

             I have a serious problem with a series of
 OM images in the UVW1 filter, a problem that I would like
 to solve before Friday because I would like to decide whether to
 re-submit a proposal to HST, or whether instead my source has 
 become too faint for STIS spectroscopy.

   I have exposures of a supersoft X-ray source, N LMC 1995,
 taken in 2003 (no. 0148870101) and for the first time the OM was
 left on. When the field was observed before, there is a quite-bright
 star in the field that was thought to be too bright for OM exposures,
 but the threshold changed when I re-submitted in the proposal in
 2002. We have however only exposures in the UVW1 filter (I think
 that it was still not possible to do imaging with the optical filters).

   Now, even if I was expecting to have quite a bright UV source
 in the centre of the field, I do not see any such source, which
 would mean that my target has an unexpected UV behaviour and...
 that I should not try to re-submit an HST-STIS proposal with
 the present status of the source. However, things look quite
 puzzling and I wonder whether the right field was pointed,
 despite the fact that the XRT pointing was right and that 
 the right coordinates are also written in the header. 
 The UVW1 images I have do not have any resemblamce with the
 field in B and V colours. I know that comparing UV with
 B-V images can be quite tricky, even in the LMC, but this
 time it really looks amazingly different for me. In addition to 
 this, I have OM images in other XMM pointings where the astrometry is 
 non-accurate by as much as 5 arcsec, so it is very difficult
 to recognize other stars in the field from their relative
 brightness and relative position supplied by the SAS data
 analysis lists.    
 
    Could you please check whether I can be absolutely
 sure that the right field was pointed, and could you help
 me identify some other stars in the field, so that at 
 least I will be able to give upper limits to the UV 
 luminosity in the final paper?

   Thank you very much,

                      Marina Orio
   
----------------------------------------------------------
  Marina Orio:  orio@to.astro.it,orio@cow.physics.wisc.edu
  Osservatorio Astronomico di Pino Torinese
  Strada Osservatorio 20,
  I-10025 Pino Torinese (TO), Italy
  Tel -39-011-81019-10   Fax -39-11-011-81019-30
----------------------------------------------------------


Reply 1

Resend
From: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
To: orio@to.astro.it
Subject: Re: urgent problem with OM (PR#9925)
Date: Mon Jan 19 18:43:45 2004
Dear Marina,
 
From a first glance at the FITS FILE from XSA (http://xmm.vilspa.esa.es/xsa/,
using VIEW FITS FILE) I get the impression that the UVW1 image for observation
0148870101 is ok. For instance the coordinates of the bright star at 05 26 38.7,
-70 03 50 look quite ok.

The fact that OM was not allowed for your first observation may have been
because of the very crowded field that produced a dose of photons over the
acceptable.

Best regards,

Nora

----
Dr. Nora Loiseau
XMM-Newton User Support Group


Followup 1

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Date: Tue, 20 Jan 2004 08:54:34 +0100 (CET)
From: orio <orio@to.astro.it>
To: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
Subject: Re: problem with OM (PR#9925)
  Dear Nora,

         Thank you for your reply. In the images that I have
 been given in the PIPEPROD, unlike in other data sets that I have
 received, there is no "WCS". The coordinates are missing.,
 The only coordinates I obtain are from
 the OBSMLI list, and I sort of have to guess what they refer
 to, by looking at the brightest ones. Should I run the OM chains
 again, or download the data again?

   Thank you,
                Marina Orio

----------------------------------------------------------
  Marina Orio:  orio@to.astro.it,orio@cow.physics.wisc.edu
  Osservatorio Astronomico di Pino Torinese
  Strada Osservatorio 20,
  I-10025 Pino Torinese (TO), Italy
  Tel -39-011-81019-10   Fax -39-11-011-81019-30
----------------------------------------------------------



Followup 2

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Date: Tue, 20 Jan 2004 09:14:44 +0100 (CET)
From: orio <orio@to.astro.it>
To: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
Subject: Re: urgent problem with OM (PR#9925)
  Hello,
        I just sent you a previous emssage (in which I talk about the lack
of WCS in my OM pipeprod files).
        I also looked at the xsa page again, and I do not see
 OM data to retrieve again. I am not sure what you were able to find 
 in the archive, but I do not seem to be able to view the fits files
 you obviously found for the OM.
   Sorry, I need some help here.
   Thank you,

                      Marina Orio

----------------------------------------------------------
  Marina Orio:  orio@to.astro.it,orio@cow.physics.wisc.edu
  Osservatorio Astronomico di Pino Torinese
  Strada Osservatorio 20,
  I-10025 Pino Torinese (TO), Italy
  Tel -39-011-81019-10   Fax -39-11-011-81019-30
----------------------------------------------------------



Reply 2

Resend
From: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
To: orio@to.astro.it
Subject: Re: urgent problem with OM (PR#9925)
Date: Tue Jan 20 15:05:43 2004
Hi Marina,

at xsa you have to make an extra click to select OM exposures, When you look at
"exposures" by default all instruments except OM are selected. Then when you
click on one of the OM thumbnails (for exposure 007, 009 or 010) and there you
can click "View FITS FILE". 
OM positions until next release can not be obtained with very good presicion,
errors can be up to 6 arc seconds. Errors of the EPICs on the contrary are 
about 2 arc seconds. 
I had a look at your field, I do not know if your source is the strong X ray
source at 05 26 49.6, -70 01 37. It is very difficult to identify it in UVW1
because the field is very crowded. What you will have to do is to identify the
strongest stars in the UVW1 field, correct the coordinates and then identify
your source.

I am sending a separate mail with a snapshot of the images from xsa, I hope this
can help you.

Best regards,

Nora
----
Dr. Nora Loiseau
XMM-Newton User Support Group


Reply 3

Resend
From: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
To: orio@to.astro.it
Subject: Re: urgent problem with OM (PR#9925)
Date: Tue Jan 20 16:29:50 2004
Hi Marina,
> 
>          Thank you for your reply. In the images that I have
>  been given in the PIPEPROD, unlike in other data sets that I have
>  received, there is no "WCS". The coordinates are missing.,
>
I downloaded the PPS files for your observation and I have no problem with the
display of OM coordinates. Please make sure to check the image that has been
converted to sky coords:  P0148870101OMS007SIMAGE1000.FTZ
If you do not have this file just download it again, no need to run the OM chain
again.

Best regards,

Nora
----
Dr. Nora Loiseau
XMM-Newton User Support Group


Followup 3

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Date: Tue, 20 Jan 2004 17:37:53 +0100 (CET)
From: orio <orio@to.astro.it>
To: Nora Loiseau <xmmhelp@xmm.vilspa.esa.es>
Subject: Re: urgent problem with OM (PR#9925)
  Thank you, Nora. I will do so. I understand now.

                            Marina

----------------------------------------------------------
  Marina Orio:  orio@to.astro.it,orio@cow.physics.wisc.edu
  Osservatorio Astronomico di Pino Torinese
  Strada Osservatorio 20,
  I-10025 Pino Torinese (TO), Italy
  Tel -39-011-81019-10   Fax -39-11-011-81019-30
----------------------------------------------------------


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