The K2 mission of the Kepler Space Telescope offers a unique possibility to examine sources of both Galactic and Extra-galactic origin with high cadence photometry. Alongside the multitude of supernovae and quasars detected within targeted galaxies, it is likely that Kepler has serendipitously observed many transients throughout K2. Such events will likely have occurred in background pixels, coincidentally surrounding science targets. Analysing the background pixels presents the possibility to conduct a high cadence survey with areas of a few square degrees per campaign. We demonstrate the capacity to independently recover key K2 transients such as KSN 2015K and SN 2018oh. With this survey, we expect to detect numerous transients and determine the first comprehensive rates for transients with lifetimes $\leq1$ day.

中文翻译：

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K2：背景调查——在开普勒/K2 数据中寻找未被发现的瞬变

开普勒太空望远镜的 K2 任务提供了一种独特的可能性，可以通过高节奏测光来检查银河系和银河系外的来源。除了在目标星系内检测到的大量超新星和类星体外，开普勒很可能还在 K2 中偶然观察到了许多瞬变。此类事件很可能发生在背景像素中，恰好围绕着科学目标。分析背景像素提供了对每个活动几个平方度的区域进行高节奏调查的可能性。我们展示了独立恢复关键 K2 瞬态（如 KSN 2015K 和 SN 2018oh）的能力。通过这项调查，我们希望检测到大量瞬变，并确定生命周期为 $\leq1$ 天的瞬变的第一个综合费率。