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Table 4

511 keV 2σ flux upper limits for the hard X (E > 20 keV) microquasars reported in the 3rd IBIS catalog (Bird et al. 2007).

Source name RA Dec Errora F20−40b F40−100b 2σ flux limit Typec
(deg) (deg) (arcmin) (mCrab) mCrab (10-4   ph   cm-2   s-1)
XTE J1550-564 237.745 –56.479 0.2 34.0 ± 0.1 55.3 ± 0.2 2.7 LMXB
Sco X-1 244.980 –15.643 0.2 685.7 ± 0.3 24.7 ± 0.3 3.7 LMXB
GRO J1655-40 253.504 –39.846 0.6 2.3 ± 0.1 2.7 ± 0.2 2.5 LMXB
GX 339-4 255.706 –48.792 0.3 40.7 ± 0.1 46.7 ± 0.2 2.6 LMXB
1E 1740.7-2942 265.978 –29.750 0.2 29.8 ± 0.1 36.6 ± 0.1 1.6 LMXB
GRS 1758-258 270.303 –25.746 0.3 58.8 ± 0.1 75.3 ± 0.1 1.6 LMXB
SS 433 287.956 4.983 0.5 10.4 ± 0.1 5.2 ± 0.2 2.4 HMXB
GRS 1915+105 288.799 10.944 0.2 296.8 ± 0.1 123.4 ± 0.2 2.5 LMXB
Cyg X-1 299.590 35.199 0.2 763.7 ± 0.2 876.7 ± 0.3 3.0 HMXB
Cyg X-3 308.108 40.956 0.2 196.5 ± 0.2 78.3 ± 0.3 2.6 HMXB

Notes.  .

(a)

Position error expressed as radius of 90% confidence circle in arcminutes.

(b)

Fluxes averaged over the total exposure: 20–40 keV: 1   mCrab = 7.57 × 10-12   erg   cm-2   s-1 = 1.71 × 10-4   ph   cm-2   s-1 40–100 keV: 1   mCrab = 9.42 × 10-12   erg   cm-2   s-1 = 9.67 × 10-5   ph   cm-2   s-1

(d)

Type identifiers: LMXB = low mass X-ray binary, HMXB = high mass X-ray binary.

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