Discovery of Very High Energy $γ$-Rays from Markarian~180 Triggered by an Optical Outburst

Details Discovery of Very High Energy $γ$-Rays from Markarian~180 Triggered by an Optical Outburst Discovery of Very High Energy $γ$-Rays from Markarian~180 Triggered by an Optical Outburst

2006-06-26

arxiv.org/abs/astro-ph/0606630v3

Astrophys.J.648:L105-L108,2006

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ Letters, minor revisions

Scientific paper

10.1086/508020

The high-frequency-peaked BL Lacertae object Markarian~180 (Mrk~180) was observed to have an optical outburst in 2006 March, triggering a Target of Opportunity observation with the MAGIC telescope. The source was observed for 12.4 hr and very high energy $\gamma$-ray emission was detected with a significance of 5.5 $\sigma$. An integral flux above 200 GeV of $(2.3\pm0.7)\times10^{-11} {cm}^{-2} {s}^{-1}$ was measured, corresponding to 11% of the Crab Nebula flux. A rather soft spectrum with a photon index of $-3.3\pm0.7$ has been determined. No significant flux variation was found.

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