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From: Peter Wheatley <pjw@astro.le.ac.uk>
Subject: triggered observations
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Private message: yes  no

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Date: Tue, 24 May 2005 11:58:21 +0100 (BST)
From: Peter Wheatley <pjw@astro.le.ac.uk>
Subject: triggered observations
To: xmmhelp@xmm.vilspa.esa.es
Cc: Pete Wheatley <pjw@astro.le.ac.uk>
Hello, 
I have time approved for a triggered XMM observation, but I can't find 
information about how I should trigger the observation. Should I use the TOO 
Alert webpage? 

Also, please can you tell me how rapidly a triggered observation can be
scheduled? How long a delay should I expect between the trigger and the
beginning of the observation? (I know it is impossible to put a precise number
on this, but a rough indication would help with my planning).

Many Thanks, 
Peter

-- 

Peter J. Wheatley		                Dept. of Physics and Astronomy,
                                                University of Leicester, 
Tel. +44 (0)116 252 2377	                University Road,
Fax. +44 (0)116 252 2070                        Leicester LE1 7RH
http://www.star.le.ac.uk/~pjw                   U.K.


Reply 1

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From: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
To: pjw@astro.le.ac.uk
Subject: Re: triggered observations, prop 30656, (PR#17920)
Date: Tue May 24 12:39:29 2005
CC: xmmpi@xmm.vilspa.esa.es
Dear Peter, 

Regarding to your question about triggered observations: 

> I have time approved for a triggered XMM observation, but I can't find 
> information about how I should trigger the observation. Should I use the
TOO 
> Alert webpage? 
> 

Yes, you can use the ToO alert web page, specially if you need a 
very quick reaction (see below about reaction times). Please, say very 
clearly that you are triggering an approved proposal, and which is 
the proposal number. 

Other kind of questions, suggestions or comments, related to accepted
proposals should always be sent to the address:

xmmpi@xmm.vilspa.esa.es

with the proposal number in the subject of the e-mail

You can use this e-mail also to trigger the observation, but if 
the desired reaction time is less than two weeks, it is always 
better to use the ToO alert page as specified above


> Also, please can you tell me how rapidly a triggered observation can be
> scheduled? How long a delay should I expect between the trigger and the
> beginning of the observation? (I know it is impossible to put a precise
number
> on this, but a rough indication would help with my planning).
> 

The delay depends on several factors and as you already guessed it 
is not easy to give a clear answer. The main factors are: the scientific
objective and other scheduling constraints. 

Looking at your proposal scientific justification I see that you can 
react to an outburst in 2-3 hours and then the outburst duration is 
about 14 days. Having this in mind, I think the fastest reaction you 
can expect is about 1-2 days. Nevertheless, if the scientific goal can 
also be achieved by relaxing this time a little bit, we would very 
much appreciate it. 

Allowing a reaction time of  2-4 days, the re-scheduling can usually 
be performed with less stress, and, more important, the spacecraft 
maneuvres and the observation itself can be performed automatically, 
rather than manually, and hence the probability of 
errors is significantly decreased. 

A reaction time of 1-2 weeks gives more probability of finding a 
constraint free window for the observation to be performed. At some 
epochs, we have a lot of constraint observations, for instance 
observations coordinated with other satellites or which requested,
and were granted, a very long continuos pointing. If such observations 
are scheduled or being performed when the trigger is submitted, it 
may be very difficult to find something that can be removed from 
the schedule to schedule the trigger. 

There is another point which is related to the observation parameters. 
I have checked your proposal and haven't found any typical instrument
setup problem related to scientific optimization and instrument safety. 
Therefore, if the flux estimated at the time of proposal writting 
is a good estimate of the flux when the observation is triggered, the 
observation could be scheduled as it is now, without further 
interactions with you. In case you want any change, it would be 
nice that you specify it at the time of the trigger, specially 
if you want a fast reaction. If you do not want any change, you 
can also mention when you trigger the observation that you want 
the observation with the instrument set up as currently specified in the 
proposal. 

I hope this is the answer that you need and it helps you to 
prepare your observation. 

Please do not hesitate to ask any further question you may need

With best regards

Maria


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


Followup 1

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Date: Tue, 24 May 2005 14:44:59 +0100 (BST)
From: Peter Wheatley <pjw@astro.le.ac.uk>
Subject: Re: triggered observations, prop 30656, (PR#17920)
To: Maria Santos-Lleo <xmmhelp@xmm.vilspa.esa.es>
Cc: xmmpi@xmm.vilspa.esa.es
Dear Maria, That is very helpful. 
Many thanks, Peter

On Tue, 24 May 2005, Maria Santos-Lleo wrote:

> Dear Peter, 
> 
> Regarding to your question about triggered observations: 
> 
> > I have time approved for a triggered XMM observation, but I can't find

> > information about how I should trigger the observation. Should I use
the TOO 
> > Alert webpage? 
> > 
> 
> Yes, you can use the ToO alert web page, specially if you need a 
> very quick reaction (see below about reaction times). Please, say very 
> clearly that you are triggering an approved proposal, and which is 
> the proposal number. 
> 
> Other kind of questions, suggestions or comments, related to accepted
> proposals should always be sent to the address:
> 
> xmmpi@xmm.vilspa.esa.es
> 
> with the proposal number in the subject of the e-mail
> 
> You can use this e-mail also to trigger the observation, but if 
> the desired reaction time is less than two weeks, it is always 
> better to use the ToO alert page as specified above
> 
> 
> > Also, please can you tell me how rapidly a triggered observation can
be
> > scheduled? How long a delay should I expect between the trigger and
the
> > beginning of the observation? (I know it is impossible to put a
precise
> number
> > on this, but a rough indication would help with my planning).
> > 
> 
> The delay depends on several factors and as you already guessed it 
> is not easy to give a clear answer. The main factors are: the scientific
> objective and other scheduling constraints. 
> 
> Looking at your proposal scientific justification I see that you can 
> react to an outburst in 2-3 hours and then the outburst duration is 
> about 14 days. Having this in mind, I think the fastest reaction you 
> can expect is about 1-2 days. Nevertheless, if the scientific goal can 
> also be achieved by relaxing this time a little bit, we would very 
> much appreciate it. 
> 
> Allowing a reaction time of  2-4 days, the re-scheduling can usually 
> be performed with less stress, and, more important, the spacecraft 
> maneuvres and the observation itself can be performed automatically, 
> rather than manually, and hence the probability of 
> errors is significantly decreased. 
> 
> A reaction time of 1-2 weeks gives more probability of finding a 
> constraint free window for the observation to be performed. At some 
> epochs, we have a lot of constraint observations, for instance 
> observations coordinated with other satellites or which requested,
> and were granted, a very long continuos pointing. If such observations 
> are scheduled or being performed when the trigger is submitted, it 
> may be very difficult to find something that can be removed from 
> the schedule to schedule the trigger. 
> 
> There is another point which is related to the observation parameters. 
> I have checked your proposal and haven't found any typical instrument
> setup problem related to scientific optimization and instrument safety. 
> Therefore, if the flux estimated at the time of proposal writting 
> is a good estimate of the flux when the observation is triggered, the 
> observation could be scheduled as it is now, without further 
> interactions with you. In case you want any change, it would be 
> nice that you specify it at the time of the trigger, specially 
> if you want a fast reaction. If you do not want any change, you 
> can also mention when you trigger the observation that you want 
> the observation with the instrument set up as currently specified in the 
> proposal. 
> 
> I hope this is the answer that you need and it helps you to 
> prepare your observation. 
> 
> Please do not hesitate to ask any further question you may need
> 
> With best regards
> 
> Maria
> 
> 
> Maria Santos-Lleo, 
> XMM-Newton SOC 
> User Support Group
> 
> 

-- 

Peter J. Wheatley		                Dept. of Physics and Astronomy,
                                                University of Leicester, 
Tel. +44 (0)116 252 2377	                University Road,
Fax. +44 (0)116 252 2070                        Leicester LE1 7RH
http://www.star.le.ac.uk/~pjw                   U.K.


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