In this answer to Why does JWST have such a big Blind Spot? I argue that this space telescope primary relationship with time is that it strives to look way back in it and so as long as a given direction is visible sometime during the year and it doesn't matter that at any moment only about 40% of $4 \pi$ SR is viewable (polar angles 85° to 135° wrt the Sun, see below).
But now I'm wondering
- If there are some types of transient events where an infrared telescope like this (0.6 to 28 microns I think?) could offer something that Hubble or ground observatories couldn't. For that I've already asked For what types of transient events would the JWST be ideal or even uniquely-suited for observing? (If it could look in time)
But here I'd like to ask:
Question: What is the fraction of the time that the JWST could view a short transient event on-demand as a function of position on the celestial sphere?"
The author of that question gives a few examples just to illustrate the idea of transient events
Over a 6 month half-orbit of the sun, the entire sky is observable. But what happens if an interesting event occurs in the “blind spot”? Like Shoemaker-Levy or the arrival of Rama? A gravitational wave event?
and (at least) one of those really did "shine" in the thermal infrared!
JWST's field of regard (FOR) from the linked question and originally from JWST field of regard (FOR) Also see How much of the sky can the JWST see?.