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Using a prototype of the Tomo-e Gozen wide-field CMOS mosaic camera, weacquire wide-field optical images at a cadence of 2 Hz and search them fortransient sources of duration 1.5 to 11.5 seconds. Over the course of eightnights, our survey encompasses the equivalent of roughly two days on one squaredegree, to a fluence equivalent to a limiting magnitude about $V = 15.6$ in a1-second exposure. After examining by eye the candidates identified by asoftware pipeline, we find no sources which meet all our criteria. We computeupper limits to the rate of optical transients consistent with our survey, andcompare those to the rates expected and observed for representative sources ofephemeral optical light.

An optical search for transients lasting a few seconds