# Multiwavelength picture of the blazar S5 0716+714 during its brightest outburst

## TL;DR

This paper presents a comprehensive multiwavelength analysis of the brightest outburst of the blazar S5 0716+714 in 2015, combining data from radio to VHE gamma rays to study its spectral energy distribution and variability.

## Contribution

It provides the first detailed multiwavelength spectral and temporal analysis of S5 0716+714 during its brightest optical and gamma-ray outburst, integrating data from numerous observatories.

## Key findings

- Detection of VHE gamma-ray emission with 13σ significance during the outburst
- Construction of the broad-band spectral energy distribution during the flare
- Analysis of time variability across multiple wavelengths

## Abstract

S5 0716+714 is a well known BL Lac object, one of the brightest and most active blazars. The discovery in the Very High Energy band (VHE, E > 100 GeV) by MAGIC happened in 2008. In January 2015 the source went through the brightest optical state ever observed, triggering MAGIC follow-up and a VHE detection with 13{\sigma} significance (ATel 6999). Rich multiwavelength coverage of the flare allowed us to construct the broad-band spectral energy distribution of S5 0716+714 during its brightest outburst. In this work we will present the preliminary analysis of MAGIC and Fermi-LAT data of the flaring activity in January and February 2015 for the HE (0.1 < HE < 300 GeV) and VHE band, together with radio (Mets\"ahovi, OVRO, VLBA, Effelsberg), sub-millimeter (SMA), optical (Tuorla, Perkins, Steward, AZT-8+ST7, LX-200, Kanata), X-ray and UV (Swift-XRT and UVOT), in the same time-window and discuss the time variability of the multiwavelength light curves during this impressive outburst.