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From: kargaltsev@gwu.edu
Subject: visibility concerns
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Date: Thu, 4 Oct 2018 21:27:56 GMT
From: kargaltsev@gwu.edu
To: xmmhelp@sciops.esa.int
CC: kargaltsev@gwu.edu
Subject: visibility concerns 
Full_Name: Oleg Kargaltsev
Submission from: (NULL) (193.147.152.102)


Hello, 

Maximum visibility for my target according to the visibility checker is 14,759
s. I would like to request a 14 ks exposure with EPIC. When I fill out the RPS
form, it says after verification - "Total observation duration 18 ks". Do I need
to take into account the fact that this duration is longer than maximum target
visibility or not?

 The XMM Handbook Section 4.5.1 says " Operational overheads do not need to be
taken into account in XMM-Newton observing proposals."  So, I presume I can
simply ignore the overrun. However, I would like to confirm it because last
Cycle my proposal for this target was rejected solely because of this reason.

Thank you,

Oleg  


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From: Maria Santos-Lleo <xmmhelp@sciops.esa.int>
To: kargaltsev@gwu.edu
Subject: Re: visibility concerns (PR#84067)
Date: Thu Oct  4 22:10:16 2018
Dear Oleg

Section 4.5.1 of Users Handbook refers to slew and AOCS star acquisition.

The instrument overhead, explain in the following section, is what is added by
HRPS 
after you fill in the science exposure time. Unfortunately for your case, the 
instrument set up does need to be performed while on-target, so if the maximum 
visibility is about 14ks and the overhead is 4ks, the maximum science time 
is 10ks. 

So the recommendation would be to try to see if 10ks exposures make sense for
your scientific objective, and perhaps also bear in mind that you will have 
increased probability of high background radiation, being your observation
done at one of the revolution ends.

With best wishes

Maria


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