Astronomy & Astrophysics

Table 1: Results of the HESS observations of PG 1553+113.
Table 2: Results of the best $\chi ^2$ fit to the annual and overall spectra of PG 1553+113 measured by HESS.
Table 3: Photon indices and integral fluxes measured by HESS and MAGIC.
Table 4: HESS observation log during the Suzkau epoch.