Gamma-Ray Burst (IMAGE) University of Bath Caption Impression of a GRB outflow showing the prompt phase (gamma-ray flash), reverse shock and forward shock. Credit Nuria Jordana-Mitjans Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.