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

Abstract

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 $(2.3\pm 0.7)\times 10^{-11}{cm}^{-2}{s}^{-1}$ was measured, corresponding to 11% of the Crab Nebula flux. A rather soft spectrum with a photon index of $-3.3\pm 0.7$ has been determined. No significant flux variation was found.

Accepted by ApJ Letters, minor revisions

References in corpus (1)

• Discovery of VHE gamma-ray emission from 1ES1218+30.4

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