PKS 2005-489 at VHE: four years of monitoring with HESS and simultaneous multi-wavelength observations

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Table 2:

Best $\chi ^2$ fits of a power-law to the various spectra of PKS 2005-489 measured by HESS.
Epoch	$E_{\rm lower}$	$E_{\rm upper}$	$\Gamma$	I₄₀₀	$\chi ^2$	NDF	P( $\chi ^2$ )
	[TeV]	[TeV]		[10^-11 cm^-2 s^-1 TeV^-1]
2004 (AH05)^a	0.2	2.7	$3.98\pm0.38_{\rm stat}\pm0.10_{\rm syst}$	$0.74\pm0.27_{\rm stat}\pm0.15_{\rm syst}$	5.6	7	0.59
2004^b	0.30	4.0	$3.65\pm0.39_{\rm stat}\pm0.10_{\rm syst}$	$1.62\pm0.33_{\rm stat}\pm0.32_{\rm syst}$	6.7	7	0.46
2005	0.32	5.1	$3.09\pm0.22_{\rm stat}\pm0.10_{\rm syst}$	$1.46\pm0.28_{\rm stat}\pm0.29_{\rm syst}$	13.3	6	0.038
2006	0.35	11	$2.86\pm0.20_{\rm stat}\pm0.10_{\rm syst}$	$1.28\pm0.20_{\rm stat}\pm0.26_{\rm syst}$	3.7	7	0.53
2007^c	0.24	0.75	$3.48\pm0.68_{\rm stat}\pm0.10_{\rm syst}$	$1.00\pm0.22_{\rm stat}\pm0.20_{\rm syst}$	0.6	2	0.74
Total	0.3	5.3	$3.20\pm0.16_{\rm stat}\pm0.10_{\rm syst}$	$1.37\pm0.17_{\rm stat}\pm0.27_{\rm syst}$	9.9	8	0.27

Notes. ^(a) This (AH05) is the previously published HESS result (Aharonian et al. 2005) for 2004, and was not corrected for long-term changes in the optical efficiency of the system. ^(b) The 2004 entry is the very same data as presented in AH05, but with a correction (see text) applied to account for relative changes in the optical throughput of the HESS array. The 2005, 2006, 2007, and total entries also have this correction applied. ^(c) The 2007 spectrum is generated with the spectrum cuts (Aharonian et al. 2006b), see Sect. 3.2

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