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From: evg@astro.columbia.edu
Subject: EPIC-pn timing of pulsars - timing errors?
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1 followups: 1

Private message: yes  no

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Date: Tue, 16 Sep 2003 05:02:49 GMT
From: evg@astro.columbia.edu
To: xmmhelp@xmm.vilspa.esa.es
CC: evg@astro.columbia.edu
Subject: EPIC-pn timing of pulsars - timing errors?
Full_Name: Eric Gotthelf
Submission from: (NULL) (128.59.171.47)


Dear XMMhelp:

I would like know if XMM EPIC-pn data can be used for accurate 
pulsar timing. Is the XMM time assignment of each EPIC-pn photon 
correct? I have heard various stories and conflicting report at 
conferences.

What is the official statement on this matter? And is there any 
documentation on this subject, i.e.,

What is the nature of the problem? Is there a method to verify 
the time assignment in a given observation? Is there a method 
to correct the photon arrival times? Is the barycentering 
proceedure correct and trustworthy? 

Thank you,
Eric


Reply 1

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From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: evg@astro.columbia.edu
Subject: Re: EPIC-pn timing of pulsars - timing errors? (PR#9159)
Date: Tue Sep 16 09:40:10 2003

Dear Dr. Gotthelf,

I am sending you in a separate e-mail the most up-to-date information about the
timing accuracy of XMM-Newton. 

I hope it is useful. If you have further questions, please do not hesitate to
contact us.

Regards,

		Rosario Gonzalez-Riestra
		XMM-SOC User Support Group
	


Followup 1

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Date: Tue, 16 Sep 2003 17:03:33 -0400 (EDT)
From: Eric Gotthelf <evg@astro.columbia.edu>
To: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
cc: Eric Gotthelf <evg@astro.columbia.edu>
Subject: Re: EPIC-pn timing of pulsars - timing errors? (PR#9159)
Dear Rosario,

The documentation which you sent proves to be extremly useful. I learned
that there are several timing problems and that all of these are fixed in
the next SAS release - when might this be? In the meanwhile, is there a
fix for the timing problems that can be applied to correct for the timing
errors now?

Thank you.
Eric

------------------------------/>/</>/</--------------------------------
Eric Gotthelf
Columbia Astrophysics Laboratory      WORK: 212-854-9047
Pupin Hall, Columbia University        FAX: 212-854-8121
550 West 120th St,                   EMAIL: eric@astro.columbia.edu
New York, NY 10027, USA                WEB: www.astro.columbia.edu/~eric
------------------------------/X//X//X/--------------------------------


On Tue, 16 Sep 2003, Rosario Gonzalez Riestra wrote:

>
>
> Dear Dr. Gotthelf,
>
> I am sending you in a separate e-mail the most up-to-date information about
the
> timing accuracy of XMM-Newton.
>
> I hope it is useful. If you have further questions, please do not hesitate
to
> contact us.
>
> Regards,
>
> 		Rosario Gonzalez-Riestra
> 		XMM-SOC User Support Group
>
>



Reply 2

Resend
From: Rosario Gonzalez Riestra <xmmhelp@xmm.vilspa.esa.es>
To: evg@astro.columbia.edu
Subject: Re: EPIC-pn timing of pulsars - timing errors? (PR#9159)
Date: Wed Sep 17 16:42:47 2003

Dear Eric,

There seems that there are no fixes for the timing problems outside SAS. The new
version will be released most likely by the end of the year (but the date is not
decided yet).

The only thing that can be 'easily' fixed is the absolute time shift, that can
be corrected just by adding 1252.34 microsec to the times.

If you have any more specific question, please let me know and I'll pass it to
the experts.

Regards,
                    Rosario
 

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