Abstract

S5 0716+714 is a well known BL Lac object, and 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 σ 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 (Metsähovi, 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.

Highlights

  • The BL Lac object S5 0716+714 is among the brightest and most active blazars [1]

  • The unprecedented outburst of the BL Lac object S5 0716+714 in January 2015 was observed in all the wavebands

  • The MAGIC detection of the source, together with simultaneous data in the HE range from Fermi-LAT, will allow us to constrain the Inverse Compton part of the broadband spectrum

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Summary

Introduction

The BL Lac object S5 0716+714 is among the brightest and most active blazars [1]. Because of the featureless optical continuum, it is hard to estimate its redshift. A value of z = 0.31 ± 0.08 is derived from the photometric detection of the host galaxy [2]. It was detected in VHE for the first time by MAGIC in 2008 [3]. S5 0716+714 is among the bright blazars in the Fermi-LAT (Large Area Telescope) Bright AGN Sample (LBAS) [8], whose GeV spectra are governed by a broken power law. The source was detected at its historic high brightness at optical and IR bands. In January 2015, MAGIC, triggered by the high optical state and by high energy photons detected by Fermi-LAT, detected the source with a significance of ∼ 13σ [10]

Instruments Involved
MAGIC Analysis
Fermi-LAT Analysis
Multiwavelength Light Curves
Discussion
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