# Learning Transient Universe in Near-Ultraviolet By Wide-angle Cameras

## TL;DR

This paper proposes a space-based near-ultraviolet sky patrol mission using multiple wide-angle cameras to detect and study transient astronomical events like supernova shock breakouts and stellar flares.

## Contribution

It introduces a novel mission concept with eight small wide-field NUV cameras for real-time detection of transient events across a large sky area.

## Key findings

- Simulations show effective detection of galactic and extragalactic transients.
- The proposed system can monitor 3000 square degrees simultaneously.
- Real-time onboard software enables prompt transient detection.

## Abstract

We perform a detailed analysis and simulations on the transient detection capability in the near-ultraviolet (NUV) band by focusing on some major local transient events. These events include the tidal disruption event due to a supermassive blackhole, the shock breakout of a core-collapse supernova and the flare of a late-type star. Our simulations show that a set of small wide-angle NUV cameras can allow us to detect and study numerous galactic and extra-galactic transient events. Based on the analysis and simulations, here we propose a space-based NUV sky patrol mission by updating the proposal that was originally submitted to the Chinese Space Station mission in 2011. The mission proposed here is composed of a set of eight small wide-field NUV cameras each with a diameter of 20cm. The total sky area simultaneously covered by the NUV cameras is as large as 3000$\mathrm{deg^2}$. The survey cadence ranges from 30 to 300s. The transient events are required to be detected by a dedicated on-board software in real time.