Lunch talk on Apr. 3, 2023

Gamma-ray Bursts with Peculiar Origins

Speaker: Jun Yang (Nanjing University)

Venue: SWIFAR Building 2111

Time: 12:30 PM, Monday, Apr. 3, 2023

Abstract: 

It is generally believed that long-duration gamma-ray bursts (GRBs) are associated with massive star core-collapse, whereas short-duration GRBs are associated with mergers of compact star binaries. However, growing observations have suggested that oddball GRBs do exist, and multiple criteria (prompt emission properties, supernova/kilonova associations, and host galaxy properties) rather than burst duration only are needed to classify GRBs physically. In this talk, I will first provide a brief overview of the current understanding of gamma-ray bursts in terms of both observations and theory. Subsequently, I will introduce our recent works on gamma-ray bursts with peculiar physical origins, including three cases: the peculiar short burst GRB 200826A originating from a core-collapse, the peculiar long burst GRB 211211A originating from a compact star merger, and the peculiar short burst GRB 200415A originating from a magnetar giant flare. These gamma-ray bursts with peculiar physical origins demonstrate the diversity of progenitor of gamma-ray bursts.

Report PPT:  SWIFAR_Jun Yang.pdf