# The VHE Gamma-Ray View of the FSRQ PKS~1510-089

## TL;DR

This paper reviews the VHE gamma-ray observations of the quasar PKS 1510-089, highlighting its variable emission, a significant 2016 flare, and the lack of correlation across different energy bands, emphasizing ongoing monitoring efforts.

## Contribution

It provides a comprehensive summary of VHE gamma-ray observations of PKS 1510-089, including recent flare detection and multi-wavelength behavior analysis.

## Key findings

- PKS 1510-089 is a weak but regular VHE gamma-ray emitter.
- A strong VHE flare was detected in 2016 by H.E.S.S. and MAGIC.
- No clear correlation between VHE and other energy bands was established.

## Abstract

The flat spectrum radio quasar PKS 1510-089 is a monitored target in many wavelength bands due to its high variability. It was detected as a very-high-energy (VHE) $\gamma$-ray emitter with H.E.S.S. in 2009, and has since been a regular target of VHE observations by the imaging Cherenkov observatories H.E.S.S. and MAGIC. In this paper, we summarize the current state of results focusing on the monitoring effort with H.E.S.S. and the discovery of a particularly strong VHE flare in 2016 with H.E.S.S. and MAGIC. While the source has now been established as a weak, but regular emitter at VHE, no correlation with other energy bands has been established. This is underlined by the 2016 VHE flare, where the detected optical and high-energy $\gamma$-ray counterparts evolve differently than the VHE flux.