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 A.1

XSPEC model components and best-fit parameters for GRS 1915+105.

Component	Parameter	OBS 1	OBS 2	OBS 3
DiskBB	T_in [keV]
DiskBB	Norm
CompST	kT_e [keV]
CompST	τ	13.145_−6.9		10.959_−4.7
Powerlaw	Γ_phot
Gaussian	E_Line [keV]	6.4*
Gaussian	σ [keV]
Gaussian	W [eV]	66.44	87.76	70.44
(NDF)		0.82 (77)	0.96 (78)	0.99 (80)
Component	Parameter	OBS 4	OBS 5	OBS 6
DiskBB	T_in [keV]
DiskBB	Norm
CompST	kT_e [keV]
CompST	τ
Powerlaw	Γ_phot
Gaussian	E_Line [keV]	6.4*
Gaussian	σ [keV]
Gaussian	W [eV]	91.15	91.78	86.93
(NDF)		1.12 (80)	1.19 (83)	0.82 (80)

Notes. As discussed in the text, an additional Wabs component (with equivalent hydrogen column density fixed to N_H = 6 × 10²² cm⁻²) was used tomodel the effects of interstellar absorption. The parameter errors correspond to a Δχ² of 2.71. Frozen parameters are indicated by *.

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