Oral Presentation

Gamma-Ray Burst and Transient sciences

Author(s): Yuji Urata (NCU), Kuiyun Huang (CYCU), Kenji Toma (Tohoku U), Jiro Shimoda (Nagoya U) and the GRB follow-up team

Presenter: Yuji Urata (NCU)

Gamma-Ray Bursts (GRBs) are highly energetic explosions in the universe, and are currently being exploited as probes of first-generation stars and gravitational wave transients. In fact, the distant events at the reionization epoch and the short GRB coincident with a gravitational wave transient have already been observed, respectively. Submillimeter (submm) and millimeter (mm) follow-up observations have played an essential role in identifying GRB afterglow and host galaxies in, for example, delineating the energy scale, geometry, radiation physics, and environments of long GRBs. Here, we report recent progresses using ALMA and SMA. On the GRB 171205A, we made the first detection of radio polarization of GRB afterglow with the first intensive combined use of telescopes in the mm and submm ranges. Based on this successful detection, we also perform the first radio polarimetric observations of a fast-rising blue optical transient, AT2018cow, which is also relativistic explosion phenomena.