Time Coordinate: 3:30 pm 25th Nov. 2016 (Friday)

Space Coordinate: NTHU General Building II, R521

Speaker: Dr. Tetsuya Hashimoto (NTHU)

Subaru observations of dark Gamma-Ray Burst host galaxy

Study of host galaxies of Long Gamma Ray Burst (GRB) is a key to understanding the origin of GRB. We focus on the metallicity environment of optically 'dark' GRBs, which is a missing population due to the faintness of their afterglows. We found that the host galaxy of GRB 070306 and 080325 are among the highest metallicity in current GRB host samples in contrast to the theoretical low-metallicity requirement. I will discuss the metallicity environment and origin of dark GRBs in comparison with the so-called fundamental metallicity relation of star-forming galaxies.