Multi-Wavelength Observations of the HBL Object 1ES 1011+496 in Spring 2008

TL;DR

This paper reports on a comprehensive multi-wavelength observational campaign of the blazar 1ES 1011+496 in spring 2008, including VHE gamma-ray detection and spectral analysis, enhancing understanding of its emission across the spectrum.

Contribution

First multi-wavelength campaign including VHE gamma-ray coverage for 1ES 1011+496, providing detailed spectral data and insights into its emission mechanisms.

Findings

Detected the source at ~7 sigma significance

Observed spectral index similar to initial discovery

Provided multi-wavelength spectral energy distribution modeling

Abstract

In the spring of 2008 MAGIC organised multi-wavelength (MWL) observations of the blazar 1ES 1011+496. 1ES 1011+496 is a high-frequency peaked BL Lac object discovered at VHE gamma-rays by MAGIC in spring 2007 during an optical outburst reported by the Tuorla Blazar Monitoring Programme. MAGIC re-observed the source during the 2008 MWL campaign which also included the Mets\"ahovi, KVA, Swift and AGILE telescopes. This was the first MWL campaign on this source that also included VHE coverage. MAGIC observed 1ES 1011+496 from March 4th to May 24th 2008 for a total of 27.9 hours, of which 20 h remained after quality cuts. The observations resulted in a detection of the source a ~7 sigma significance level with a mean flux and spectral index similar to those during the discovery. Here we will present the results of the MAGIC observations of the source in combination with contemporaneous observations at other wavelengths (radio, optical, X-rays, high energy gamma-rays) and discuss their implications on the modelling of the spectral energy distribution.