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, and from some cases with host galaxy identifications, implying exciting possibilities of using them as a new cosmological probe. Here we propose to conduct Subaru follow-up for FRBs to detect the first optical variable counterpart and reveal the progenitors. The unique wide-field imaging capability of Subaru/HSC to cover entire FRB error regions (order of a few × 10 arcmin) with 8m-class sensitivity is especially powerful. We primarily target nearby FRBs whose redshifts are estimated to be < 0.1 based on their dispersion measures. We expect a couple of nearby FRBs in a semester. 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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