Short Gamma Ray Bursts Localized . ... Credit Copyright: Dana Berry, NASA Explanation: What causes gamma-ray bursts? ... Long duration gamma-ray bursts (GRBs) have been localized , over the past few years, to blue regions in the universe rich in star formation. ... Over the past few months, short duration GRBs have finally been localized and found to occur in different types of regions -- not only blue regions rich in star formation. ... NASA Web Site Statements, Warnings, and Disclaimers . ...