First hard X-ray observations of the blazar S5 0716+714 with NuSTAR during a multiwavelength campaign

Abstract

We report the results of a multifrequency campaign targeting S5 0716+714 in the flaring state of the source observed in 2015 January and February. The observations have been performed using the following instruments: Fermi/Large Area Telescope (LAT), Nuclear Spectroscopic Telescope Array, X-ray Telescope and Ultraciolet/Optical Telescope. The elevated flux level was visible in all frequencies and the outburst consists of five sub-flares. In this paper we focus on the analysis of the X-ray observations both in the soft and hard regimes for data collected with NuStar and Swift/XRT. This is the first time, when hard X-ray observations of the source collected with NuStar are reported. The studies reveal both low- and high-energy components clearly visible in the energy band, with the break energy of 8 keV, which is the highest break energy ever reported for S5 0716+714. The second part of this work is concentrated on multifrequency observations collected during the flaring activity period. The variability patterns recorded during the period are characterized using a fractional variability amplitude and description of the flare profiles. The correlation studies reveal strong and significant relation between the optical, ultraviolet and gamma-ray observations, and no time lag is found for any of the studied relations.

References in corpus (9)

• Fermi Large Area Telescope Bright Gamma-ray Source List
• The VLA Low-frequency Sky Survey
• Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714
• Swift and infra-red observations of the blazar 3C~454.3 during the giant X-ray flare of May 2005
• Superorbital variability of X-ray and radio emission of Cyg X-1 - II. Dependence of the orbital modulation and spectral hardness on the superorbital phase
• Simultaneous X-ray and optical observations of S5 0716+714 after the outburst of March 2004
• Disentangling the synchrotron and Inverse Compton variability in the X-ray emission of the intermediate BL Lac object S5 0716+71
• AGILE detection of variable gamma-ray activity from the blazar S5 0716+714 in September-October 2007
• Swift/XRT view on S5 0716+714 during a flare

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• Intra-Night Optical Variability Monitoring of Fermi Blazars: First Results from 1.3 m J C Bhattacharya Telescope
• Multi-color optical monitoring of the BL Lacertae object S5 0716+714 during the 2012 outburst
• Extremely rapid x-ray flares of tev blazars in the rxte era
• A 31.3 day Transient Quasiperiodic Oscillation in Gamma-ray Emission from Blazar S5 0716+714
• X-ray timing and spectral variability properties of blazars S5 0716+714, OJ 287, Mrk 501, and RBS 2070
• H.E.S.S. Monitoring of PKS 2155-304 in 2015 and 2016
• Hard X-ray properties of radio-selected blazars
• Constraining X-ray emission in HBL blazars using multiwavelength observations
• Statistical analysis of variability properties of the Kepler blazar W2R 1926+42
• NuSTAR View of TeV Blazar Mrk 501
• Variability Study and Searching for QPOs with day-like periods in the blazar S5 0716+714 with TESS
• Testing High-Energy Emission Models for Blazars with X-ray Polarimetry
• Optical Monitoring and Long-term Optical Spectral Variability of BL Lacertae Object S5 0716+714