# Long-term gamma-ray observations of the binary HESS J0632+057 with H.E.S.S., MAGIC and VERITAS

## TL;DR

This paper presents a comprehensive analysis of over ten years of gamma-ray observations of the binary HESS J0632+057, revealing its orbital phase coverage and an unusual bright outburst, with multi-wavelength context.

## Contribution

It provides the first long-term gamma-ray light curve covering all orbital phases of HESS J0632+057 using data from H.E.S.S., MAGIC, and VERITAS.

## Key findings

- Detected significant gamma-ray emission in almost all orbital phases.
- Observed an unusually bright TeV outburst in January 2018.
- Correlated gamma-ray data with X-ray observations from Swift.

## Abstract

The gamma-ray binary HESS J0632+057 has been observed at very-high energies (E $>$ 100 GeV) for more than ten years by the major systems of imaging atmospheric Cherenkov telescopes. We present a summary of results obtained with the H.E.S.S., MAGIC, and VERITAS experiments based on roughly 440 h of observations in total. This includes a discussion of an unusually bright TeV outburst of HESS J0632+057 in January 2018. The updated gamma-ray light curve now covers all phases of the orbital period with significant detections in almost all orbital phases. Results are discussed in context with simultaneous observations with the X-ray Telescope onboard the Neil Gehrels Swift Observatory.