According to Tomsick, the radio emission from the gas and dust surrounding the star make those pulses more difficult to read.

MSN: Runaway star may be fastest pulsar yet - Technology & science - Space - Space.com | NBC News

For the first time, astronomers have determined the size and shape of the highly-charged region of radio emission surrounding the black hole.

BBC: By BBC News Online Science Editor Dr David Whitehouse

What you would see, says Fender, is emission in the x-ray, radio, infrared or optical.

FORBES: Free-Floating, Nearby Black Holes Detectable By Decade's End, New Study Reports