Thanks, that's reassuring... I think."Cosmic pulse" doesn't refer to anything astronomical. That is, it's not in the vocabulary.
That's not to say that hugely powerful waves of energy can't fry us from some distant star out in space. Check it out - this happened in 2004:
LinkThe flood of gamma and X-rays that washed over the Earth was detected by several satellites designed to observe the high-energy skies. RHESSI, which observes the Sun, saw this blast. INTEGRAL, used to look for gamma rays from monster black holes, saw this blast. The newly-launched Swift satellite, which was designed and built to detect bursts of gamma-ray from across the Universe, not only saw this blast but was so flooded with energy its detectors completely saturated—think of it as trying to fill a drinking glass with a fire hose. Even more amazingly, Swift wasn’t even pointed anywhere near the direction of the burst: In other words, this flood of energy passed right through the body of the spacecraft itself and was still so strong it totally overwhelmed the cameras.
It gets worse. This enormous wave of fierce energy was so powerful it actually partially ionized the Earth’s upper atmosphere, and it made the Earth’s magnetic field ring like a bell. Several satellites were actually blinded by the event. Whatever this event was, it came from deep space and still was able to physically affect the Earth itself!
That's from Phil Plait who runs the "Bad Astronomy" website. He doesn't make stuff up. That star was 50,000 light years away and still hit us hard. There are thousands of similar stars half that distance and less from the Earth.
But you still shouldn't worry. After all, you can't do anything about it.
Even our own Sun could kill us so who cares what else out there can?