Since they found a local 250-1000 ly away neutron star then is there also a black hole nearby too?

Question

Well, Neutron star flying in space fast like Calvera was perhaps from a Supernovae and so maybe a similar sized small singularity too.

HOPEFULLY NOT THOUGH GAMMA RAY BURSTST from a small black hole

Answer 1

There could be a black hole nearby, yet this is probably unlikely.  Although the formation of a black hole has a few similarities to the formation of a neutron star, there is no evidence to support that the both occur in tandem with each other, in the same local regions of space.  The best bet at a "close" black hole would be one located at the center of our galaxy.  And even that is an incredible distance from us.

from source:

"Some stars upon gravitational collapse form black holes. A star less than 1.4 times the mass of the sun will become a white dwarf. A star between 1.4 and 3 times the mass of the sun will become a neutron star. It's only those stars greater than 3 times the mass of the sun that become black holes upon collapse."

Answer 2

Gerally speaking, the fact that there's a neutron star means that there probably isn't a black hole. The neutron star is the scene of the crime, so to speak where a star has died, and the fact that it is still there as a neutron star means that its mass wasn't great enough to implode it down to singularity. That's why it's still a neutron star.

Answer 3

What makes you say this?  

There is nothing about the existance of a neutron star that requires or even implies then presence of a black hole. Sure its possible. But I think its more likely they will find a cloud of dust nearby.