Table 4

H.E.S.S. VHE γ-ray integral flux upper limits above the telescope energy threshold corresponding to both event selection regimes.

Target Cuts TLive [s] [°] Ethresh [GeV] I(>Ethresh) [ph cm−2 s−1]
GRS 1915+105 Standard 24681 40.6 562 <7.338 × 10−13
Hard 24681 40.6 1101 <1.059 × 10−13
Cir X-1 Standard 19433 43.6 562 <1.172 × 10−12
Hard 19433 43.6 1101 <4.155 × 10−13
V4641 Sgr Standard 6335 8.4 237 <4.477 × 10−12
Hard 6335 8.4 422 <4.795 × 10−13

Notes. The upper limits are derived at the 99% confidence level, assuming a power-law spectrum (d N∕d EEΓ) with the photon index Γstd = 2.6 for standard cuts and Γhard = 2.0 for hard cuts. The rather high threshold energies derived for GRS 1915+105 and Cir X-1 are the result of large maximum observational zenith angles.

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