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There are currently many large-field surveys operational and plannedincluding the powerful Vera C. Rubin Observatory Legacy Survey of Space andTime. These surveys will increase the number and diversity of transientsdramatically. However, for some transients, like supernovae (SNe), we can gainmore understanding by directed observations (e.g. shock breakout, $\gamma$-raydetections) than by simply increasing the sample size. For example, the initialemission from these transients can be a powerful probe of these explosions.Upcoming ground-based detectors are not ideally suited to observe the initialemission (shock emergence) of these transients. These observations require alarge field-of-view X-ray mission with a UV follow up within the first hour ofshock breakout. The emission in the first one hour to even one day providesstrong constraints on the stellar radius and asymmetries in the outer layers ofstars, the properties of the circumstellar medium (e.g. inhomogeneities in thewind for core-collapse SNe, accreting companion in thermonuclear SNe), and thetransition region between these two. This paper describes a simulation for thenumber of SNe that could be seen by a large field of view lobster eye X-ray andUV observatory.

Supernovae Shock Breakout/Emergence Detection Predictions for a Wide-Field X-ray Survey