Figure 12-47The Most Powerful Known Bursts Gamma-ray bursts have been observed everywhere in the sky, indicating that, unlike X-ray bursters, most do not originate in the disk of the Milky Way Galaxy. This map of the entire sky “unfolded” onto the page shows 2704 bursts detected by the Burst and Transient Source Experiment (BATSE) aboard the Compton Gamma-ray Observatory. (The colors indicate the brightness of the bursts; they are coded brightest in red, dimmest in violet. Gray dots indicate incomplete information about the burst strength.)