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Table 2:

Analysis results.

Observation Night
$N_{\rm excess}$ $N_{\rm backgr.}$ S $E_{\rm cut}$ [GeV] $F(E>E_{\rm min})$ $\chi^2_{\rm red,const}$ f0 $\alpha$ $\chi^2_{\rm red,PL}$
April 22, 2006 100 29 10.9$\sigma$ 350 $0.92\pm0.11$ 1.3/2 $0.98\pm0.15$ $2.05\pm0.21$ 2.1/2
April 24, 2006 419 69 25.0$\sigma$ 250 $2.32\pm0.13$ 2.7/2 $2.45\pm0.14$ $2.25\pm0.09$ 2.0/3
April 25, 2006 342 83 20.8$\sigma$ 250 $1.34\pm0.09$ 1.7/2 $1.43\pm0.09$ $2.26\pm0.12$ 0.24/3
April 26, 2006 225 62 16.4$\sigma$ 350 $1.08\pm0.09$ 1.3/4 $1.21\pm0.11$ $2.35\pm0.17$ 0.41/2
April 27, 2006 615 56 33.5$\sigma$ 350 $3.21\pm0.15$ 1.9/4 $3.37\pm0.18$ $2.07\pm0.07$ 4.8/4
April 28, 2006 311 75 19.9$\sigma$ 350 $1.14\pm0.08$ 4.3/8 $1.32\pm0.10$ $2.47\pm0.14$ 0.65/2
April 29, 2006 514 169 23.7$\sigma$ 250 $1.04\pm0.06$ 41/7 $1.14\pm0.06$ $2.28\pm0.09$ 2.0/4
April 30, 2006 69 11 10.3$\sigma$ 250 $2.39\pm0.33$ - $2.16\pm0.34$ $1.66\pm0.20$ 1.4/1
June 14, 2006 95 87 7.5$\sigma$ 450 $0.34\pm0.06$ 2.4/1 $0.168\pm0.032$ $2.38\pm0.44$ 1.5/2

Notes. Number of excess ( $N_{\rm excess}$) and background ( $N_{\rm backgr.}$) events, resulting significances S, lower cuts in event energy, integral fluxes F above $E_{\rm min}=250~{\rm GeV}$ for the April 2006 data and $E_{\rm min}=450~{\rm GeV}$ for the June 14, 2006 data (in units of $10^{-10}~{\rm cm}^{-2} ~{\rm s}^{-1}$), fit quality of a constant-flux fit to the individual observation nights (see Fig. 2), and power-law fit results for the differential energy spectra of ${\rm d}F/{\rm d}E=f_0 \cdot (E/E_0)^{-\alpha}$ with $E_0=0.5~{\rm TeV}$ for the April 2006 data and $E_0=1.0~{\rm TeV}$ for the June 14, 2006 data, respectively; f0 in units of $10^{-10}~{\rm TeV}^{-1}~{\rm cm}^{-2}~ {\rm s}^{-1}$.


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