Using a prototype of the Tomo-e Gozen wide-field CMOS mosaic camera, we acquire wide-field optical images at a cadence of 2 Hz and search them for transient sources of duration 1.5 to 11.5 seconds. Over the course of eight nights, our survey encompasses the equivalent of roughly two days on one square degree, to a fluence equivalent to a limiting magnitude about $V = 15.6$ in a 1-second exposure. After examining by eye the candidates identified by a software pipeline, we find no sources which meet all our criteria. We compute upper limits to the rate of optical transients consistent with our survey, and compare those to the rates expected and observed for representative sources of ephemeral optical light.

中文翻译：

---

对持续几秒钟的瞬变进行光学搜索

使用 Tomo-e Gozen 宽场 CMOS 马赛克相机的原型，我们以 2 Hz 的节奏获取宽场光学图像，并搜索它们以寻找持续时间为 1.5 到 11.5 秒的瞬态源。在八晚的过程中，我们的调查涵盖了大约两天一平方度的能量，其影响相当于在 1 秒曝光中约 $V = 15.6 $ 的极限震级。通过肉眼检查软件管道识别的候选者后，我们发现没有符合我们所有标准的来源。我们计算了与我们的调查一致的光学瞬变速率的上限，并将这些速率与对具有代表性的短暂光学光源预期和观察到的速率进行比较。