A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations

H.E.S.S. phase-I observations of the plane of the Milky Way

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Table 5

Estimated maximum VHE γ-ray luminosities of the target microquasars, which would still be consistent with a non-detection given the flux upper limits presented in Table 4.

Target	Maximum distance estimate	E_thresh	Luminosity above E_thresh
	[kpc]	[GeV]	[erg s⁻¹]
GRS 1915+105	10.6	562	<2.3 × 10³⁴
Cir X-1	10.2	562	<3.4 × 10³⁴
V4641 Sgr	6.9	237	<2.5 × 10³⁴

Notes. Source distances correspond to the largest estimate that was found in the literature (see Sect. 2). The energy threshold of Cherenkov telescope arrays increases with observational zenith angle.

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