Poster Presentation

A fast optical imager IMONY targeting optical counterparts of FRBs

Author(s): Takeshi Nakamori (Yamagata University)

Presenter: Takeshi Nakamori (Yamagata University)

We have developed an optical photon-counting imager named IMONY, consisting of a 64-pixel Geiger-mode avalanche photodiode array. The system records photon-detection timestamps for each pixel with a temporal resolution of 100 ns. IMONY has been operated as a guest instrument on the 1.5-m Kanata telescope and the 3.8-m Seimei telescope in Japan. We demonstrated the system’s performance through the detection of periodic optical signals from the Crab pulsar. Given IMONY's narrow field of view (~16"x16"), repeating FRBs with precisely known positions are suitable observational targets. We present an overview of the system along with selected observational results, demonstrating its capability for searching for optical emissions associated with FRBs to constrain emission scenarios.