Why doesn't this question about Supernova remnants get a helpful answer even though the bounty is awarded..? Don't anyone like this? or Is it that due to "The question is silly and waste of time"..?
There's always the risk that nobody will provide a helpful answer when you set a bounty. After all, it's only an extra incentive to answer, not a requirement.
In this case, I'm just seeing your question now but I'm not really sure what you're asking. It's quite possible that other people declined to answer for the same reason, i.e. because they thought your question was unclear.
I don't know why it was downvoted without the comments, though it is indeed a bit unclear. I personally know nothing about the problem and I just skipped it.
It has an answer, twice upvoted. A possible reason why it doesn't have another is because other people thought it is already answered, since you haven't provide any feedback to state your dissatisfaction with it.
You should counteract with answerers more to improve and clarify things. As a bonus, editing question and answer will pop the question to the top, showing your efforts, attracting attention of other people. That doubles the effect of the bounty.
It's hard to answer this because it's a whole field--- the main thing you are missing is gravitational wave emission--- this has simulation data for the two black hole case now.
There are papers going back decades, it is very active now in astrophysics, and you need someone who is familiar enough with the literature to make comprehensive accurate summary. Sometimes you get lucky, sometimes you don't. I have a vague idea of this stuff, but personally I wouldn't feel comfortable pontificating on it-- I need to know where all the folklore results come from and their limitations and confidence intervals. The question is just too ambitious, and it would probably get an answer if separated into smaller questions separately for neutron stars, black holes, and neutron star and black hole.
I doubt that two neutron stars would be able to merge without making a black hole, since they are close to the limit, but this is just a feeling.