16 gamma-ray pulsars
I knew the Fermi Gamma-ray Space Telescope would be good for something. Not only did it discover the first pulsar that blinks only in gamma-rays instead of the usual radio waves, it has discovered a total of 16 of them so far, and not doubt it will discover many more. And the gamma-ray telescope has not been in orbit for even a year yet!
Map of the 16 new pulsars in the sky
Where were they?
All over the sky, although particularly around the plane of our galaxy.