S21A0017

A Fast Radio Bursts (FRB) is a mysterious transient phenomenon whose duration is only a few milliseconds. Their distances are estimated to be cosmological (z ∼ 0.1–2) from the large dispersion measures, implying exciting possibilities of using them as a new cosmological probe. Here we propose to continue Subaru follow-up for FRBs to detect the first optical variable counterpart and reveal the progenitors. The unique wide-field imaging capability of Subaru to cover the entire FRB error regions (order of ∼ 10 arcmin) with 8m-class sensitivity is especially powerful. We expect a few FRB events in a semester. Some proposed FRB scenarios predict detectable optical counterparts on time scales from days to months, and we will search optical transients on various time scales depending on the telescope schedule at the time of an FRB alert. We also request to use any of optical/NIR spectroscopic/imaging instruments of Subaru for follow-up of particularly interesting objects found by other observatories or our own HSC observations.

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