VHE γ-ray emission of PKS 2155–304: spectral and temporal variability

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Table 1:

Summary of observations for each year.
Year	T	$n_{\rm on}$	$n_{\rm off}$	Excess	$\sigma$	$\sigma/\!\sqrt{T}$
2005	9.4	7282	27 071	1868	21.8	7.1
2006	66.1	123 567	203 815	82 804	288.4	35.5
2007	13.8	11 012	40 065	2999	28.6	7.7
Total	89.2	141 861	270 951	87 671	275.6	29.2

Notes. T represents the live-time (hours), $n_{\rm on}$ the number of on-source events, $n_{\rm off}$ the number of off-source events (from a region five times larger than for the on-source events), and $\sigma$ the significance of the corresponding excess, given in units of standard deviations.

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