Table 1: Results of the HESS observations of PG 1553+113.

Dark		 MJD MJD Time On Off $\alpha$ Excess Sig I(>300 GeV)a Crabb $\chi ^2$, NDFc P($\chi ^2$)
Period First Last [h]         [$\sigma$] [10-12 cm-2 s-1] %    
04/2005 53 492 53507 4.9 1210 8154 0.125 191 5.5 $4.78\pm1.18$ 3.5 2.7, 4 0.61
08/2005 53 609 53 614 2.7 491 3462 0.125 58 2.5 $10.19\pm5.46$ 7.5 4.9, 2 0.09
04/2006 53 849 53 860 7.1 1811 12 742 0.125 218 5.0 $4.08\pm1.10$ 3.0 5.3, 8 0.72
07/2006 53 938 53 943 10.1 2236 15 341 0.125 318 6.7 $4.33\pm0.94$ 3.2 3.1, 5 0.68
2005 53 492 53 614 7.6 1701 11 616 0.125 249 6.0 $5.44\pm1.23$ 4.0 0.9, 1 0.33
2006 53 849 53 943 17.2 4047 28 083 0.125 536 8.3 $4.22\pm0.72$ 3.1 0.03, 1 0.86
Total 53 492 53 943 24.8 5748 39 699 0.125 785 10.2 $4.56\pm0.62$ 3.4 0.7, 1 0.39
a The systematic error on the observed integral flux above 300 GeV is 20% and is not shown.
b The integral flux percentage is calculated relative to the Crab Nebula flux above 300 GeV.
c The $\chi ^2$, degrees of freedom (NDF), and $\chi ^2$ probability P($\chi ^2$) are given for a fit of a constant to I(>300 GeV) binned nightly within a dark period, or monthly within a year, or yearly within the total.

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