Did you uncover the black hole by accident, or where you certain about your discovery?

Question: Did you uncover the black hole by accident, or where you certain about your discovery?
- Keywords:
  black hole
Asked by 728pnug46 to Peter on 9 Nov 2016.
- Peter Boorman answered on 9 Nov 2016:
  
  This discovery wasn’t made by accident because the black hole was known about before I studied it. I was able to determine how hidden the black hole was from our view.
  
  Peter

Question: Did you uncover the black hole by accident, or where you certain about your discovery?