Multiwavelength observations of a TeV-Flare from W Comae

Details Multiwavelength observations of a TeV-Flare from W Comae Multiwavelength observations of a TeV-Flare from W Comae

2009-10-20

arxiv.org/abs/0910.3750v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

26 pages, 5 figures; Accepted for publication by The Astrophysical Journal

Scientific paper

We report results from an intensive multiwavelength campaign on the intermediate-frequency-peaked BL Lacertae object W Com (z=0.102) during a strong outburst of very high energy gamma-ray emission in June 2008. The very high energy gamma-ray signal was detected by VERITAS on 2008 June 7-8 with a flux F(>200 GeV) = (5.7+-0.6)x10^-11 cm-2s-1, about three times brighter than during the discovery of gamma-ray emission from W Com by VERITAS in 2008 March. The initial detection of this flare by VERITAS at energies above 200 GeV was followed by observations in high energy gamma-rays (AGILE, E>100 MeV), and X-rays (Swift and XMM-Newton), and at UV, and ground-based optical and radio monitoring through the GASP-WEBT consortium and other observatories. Here we describe the multiwavelength data and derive the spectral energy distribution (SED) of the source from contemporaneous data taken throughout the flare.

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