# The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0

## TL;DR

The ASAS-SN Light Curve Server provides real-time, unbiased aperture photometry light curves for any sky coordinate, enabling broad access to variable star data with some limitations due to real-time processing constraints.

## Contribution

This paper introduces a novel web interface for real-time, unbiased access to aperture photometry light curves across the entire sky, covering millions of sources.

## Key findings

- Provides up-to-date light curves for any sky coordinate
- Enables access to ~1 million variable sources
- Implements real-time data processing with some speed limitations

## Abstract

The All-Sky Automated Survey for Supernovae (ASAS-SN) is working towards imaging the entire visible sky every night to a depth of V~17 mag. The present data covers the sky and spans ~2-5~years with ~100-400 epochs of observation. The data should contain some ~1 million variable sources, and the ultimate goal is to have a database of these observations publicly accessible. We describe here a first step, a simple but unprecedented web interface https://asas-sn.osu.edu/ that provides an up to date aperture photometry light curve for any user-selected sky coordinate. Because the light curves are produced in real time, this web tool is relatively slow and can only be used for small samples of objects. However, it also imposes no selection bias on the part of the ASAS-SN team, allowing the user to obtain a light curve for any point on the celestial sphere. We present the tool, describe its capabilities, limitations, and known issues, and provide a few illustrative examples.