An x-ray burster is like a firework in space. Just like how a firework explodes and makes a bright colorful display in the sky, an x-ray burster is when a star in space shoots out a lot of X-rays really quickly. These X-rays are very strong and powerful, and they come from deep within the star.
Sometimes the star gets too big and heavy, and it can't hold itself up anymore. It starts to collapse in on itself, and it gets really hot and dense. That's when the X-rays burst out and shoot through space. Scientists use special tools and machines to detect these X-rays and study them. They want to know more about these x-ray burst events so they can better understand stars and other objects in space.