https://en.wikipedia.org/wiki/SN_1987A
was clear as day. Astronomers run an email list you can subscribe to to know about the next core collapse in or near our galaxy. They are hoping to get a heads up so they can point their telescopes at it as soon as possible.
And now I am reading the what-if's from 1... thanks!
It's a fun read but it's bad science.
1. A supernova, seen from as far away as the Sun is from the Earth, or
2. The detonation of a hydrogen bomb pressed against your eyeball?
Applying the physicist rule of thumb suggests that the supernova is brighter. And indeed, it is ... by nine orders of magnitude.
...Sounds like I should buy one of these IoT alarms so that I know to stay away from the window :-)
Spoiler: you won't.