The image on the left shows the aftermath of the Gamma-ray burst (GRB) in X-rays with Chandra. Chandra observations of how the X-ray emission from this GRB decreases over time provide important information about the properties of the jet. The image on the right shows an optical view from the Discovery Channel Telescope (DCT) with GRB 140903A in the middle of the square. The bright star in the optical image to the right of the middle is unrelated to the GRB.
Image Credit: NASA
Explanation from: http://chandra.harvard.edu/photo/2016/grb/more.html