*Review* **The GRB Prompt Emission: An Unsolved Puzzle**

**Željka Bošnjak 1,\* ,† , Rodolfo Barniol Duran 2,\* ,† and Asaf Pe'er 3,\* ,†**


**Abstract:** The recent multi-messenger and multi-wavelength observations of gamma-ray bursts (GRBs) have encouraged renewed interest in these energetic events. In spite of the substantial amount of data accumulated during the past few decades, the nature of the prompt emission remains an unsolved puzzle. We present an overview of the leading models for their prompt emission phase, focusing on the perspective opened by future missions.

**Keywords:** gamma-ray burst; prompt emission; relativistic jets
