# Multiwavelength observations of blazars

## TL;DR

This paper reviews how INTEGRAL's multiwavelength observations have advanced understanding of blazars, especially during outbursts, contributing to physical, cosmological, and multi-messenger astronomy insights.

## Contribution

It provides a comprehensive review of INTEGRAL's role in blazar research, highlighting observational results and future prospects in multi-messenger astronomy.

## Key findings

- Enhanced understanding of blazar spectra in 3-100 keV range
- Insights into blazar behavior during outbursts
- Progress in multi-messenger astronomy related to blazars

## Abstract

The INTEGRAL mission has played a major role in blazar science, thanks to its sensitive coverage of a spectral region (3-100 keV) that is critical for this type of sources, to its flexibility of scheduling and to the large field of view of its cameras. A number of flat-spectrum radio quasars (up to z ~ 3) and BL Lac objects were observed by INTEGRAL together with facilities at all wavelengths. These results have advanced our knowledge of blazars from a physical and cosmological point of view. This paper reviews some of these outcomes, with particular reference to the INTEGRAL program for blazars in outburst as targets of opportunity, with a perspective into a future of multi-messenger astronomy