Table 3
Spectral parameters and obtained X-ray fluxes for (candidate) transient X-ray binaries when detected.
| # | Source name | Date | Instr. | Field | N H | Γ |  (d.o.f.) |
F X,abs | F X,unabs |
| class | (1022 cm-2) | (10-12 erg cm-2 s-1) | |||||||
|
|
|||||||||
| 1 | GRS 1741–2853 | 11.4 ± 1.1 | 0.84 (176) | ||||||
| bursting neutron star LMXB | 2005-06-05 | HRC-I | GC-2 | 2.0 fix | 49.5 ± 1.5 | 98.6 ± 3.1 | |||
| 2005-07-01 | ACIS-I | 2.0 ± 0.3 | 12.0 ± 0.6 | 24.5 ± 2.0 | |||||
| 2007-03-12 | ACIS-I | 1.5 ± 0.2 | 20.5 ± 0.8 | 37.3 ± 2.4 | |||||
| 2007-04-06 | ACIS-I | 1.6 ± 0.4 | 4.55 ± 0.40 | 8.38 ± 0.49 | |||||
| 2 | AX J1745.6–2901 | 21.8 ± 0.3 | 1.25 (4185) | ||||||
| bursting neutron star LMXB | 2006-02-27 | PN | GC-2 | 1.9 ± 0.1 | 21.3 ± 0.3 | 60.2 ± 2.2 | |||
| 2007-03-12 | ACIS-I | 1.6 ± 0.1 | 139 ± 2 | 353 ± 8 | |||||
| 2007-04-06 | ACIS-I | 1.8 ± 0.1 | 95.8 ± 2.1 | 258 ± 7 | |||||
| 2007-04-18 | ACIS-I | 1.6 ± 0.1 | 149 ± 3 | 375 ± 8 | |||||
| 2007-04-30 | ACIS-I | 1.8 ± 0.1 | 115 ± 2 | 311 ± 8 | |||||
| 2007-05-16 | ACIS-I | 1.6 ± 0.1 | 61.1 ± 1.7 | 154 ± 4 | |||||
| 2007-07-24 | HRC-I | GC-2 | 2.0 fix | 144 ± 3 | 400 ± 8 | ||||
| 2007-09-06 | PN | GC-2 | 2.6 ± 0.1 | 113 ± 1 | 426 ± 2 | ||||
| 2008-03-03 | PN | GC-2 | 2.5 ± 0.1 | 147 ± 0.4 | 532 ± 2 | ||||
| 2008-05-10 | HRC-I | GC-2 | 2.0 fix | 61.7 ± 1.8 | 172 ± 5 | ||||
| 2008-07-15 | HRC-I | GC-2 | 2.0 fix | 19.2 ± 1.1 | 53.4 ± 3.2 | ||||
| 3 | SAX J1747.0–2853 | 9.5 ± 0.2 | 1.13 (1413) | ||||||
| bursting neutron star LMXB | 2005-10-20 | HRC-I | GC-3 | 2.6 fix | 58.6 ± 1.5 | 128 ± 3 | |||
| 2006-02-27 | PN | GC-3 | 2.0 ± 0.1 | 208 ± 1 | 391 ± 5 | ||||
| 2006-09-08 | PN | GC-3 | 2.6 ± 0.1 | 50.2 ± 0.5 | 112 ± 1 | ||||
| 4 | KS 1741–293 | 16.6 ± 1.8 | 1.06 (113) | ||||||
| bursting neutron star LMXB | 2007-09-06 | PN | GC-7 | 1.8 ± 0.3 | 7.75 ± 0.25 | 17.8 ± 1.9 | |||
| 2008-05-10 | HRC-I | GC-7 | 1.8 fix | 8.27 ± 0.83 | 18.5 ± 1.8 | ||||
| 2008-07-16 | HRC-I | GC-7 | 1.8 fix | 63.9 ± 0.2 | 143.4 ± 3.9 | ||||
| 5 | GRO J1744–28 | 9.4 ± 3.0 | 1.13 (67) | ||||||
| pulsating neutron star LMXB | 2005-10-20 | HRC-I | GC-4 | 2.8 fix | 0.64 ± 0.15 | 1.47 ± 0.36 | |||
| 2006-02-27 | PN | GC-4 | 2.8 ± 1.0 | 0.36 ± 0.05 | 0.85 ± 0.45 | ||||
| 2006-09-08 | MOS | GC-4 | 2.8 fix | 0.08 ± 0.03 | 0.19 ± 0.05 | ||||
| 2007-09-06 | MOS | GC-4 | 3.2 ± 1.1 | 0.25 ± 0.03 | 0.66 ± 0.20 | ||||
| 2008-03-04 | PN | GC-4 | 2.9 ± 1.0 | 0.26 ± 0.04 | 0.63 ± 0.25 | ||||
| 2008-09-27 | PN | GC-4 | 2.5 ± 0.7 | 1.16 ± 0.13 | 2.49 ± 0.79 | ||||
| 6 | XMM J174457–2850.3 | 7.5 fix | 0.51 (14) | ||||||
| unclassified | 2005-06-05 | HRC-I | GC-4 | 1.5 fix | 67.8 ± 1.8 | 103 ± 3 | |||
| 2005-07-01 | ACIS-I | 1.5 fix | 0.26 ± 0.07 | 0.39 ± 0.11 | |||||
| 2006-02-27 | PN | GC-4 | 1.5 fix | 0.35 ± 0.07 | 0.53 ± 0.09 | ||||
| 2006-09-08 | PN | GC-4 | 1.5 fix | 0.35 ± 0.05 | 0.53 ± 0.08 | ||||
| 2007-03-12 | ACIS-I | 1.5 fix | 0.11 ± 0.04 | 0.17 ± 0.05 | |||||
| 2007-04-06 | ACIS-I | 1.3 ± 1.0 | 0.77 ± 0.36 | 1.15 ± 0.32 | |||||
| 2007-04-18 | ACIS-I | 1.5 fix | 0.22 ± 0.04 | 0.34 ± 0.05 | |||||
| 2007-04-30 | ACIS-I | 1.7 ± 1.1 | 0.39 ± 0.13 | 0.62 ± 0.07 | |||||
| 2007-05-16 | ACIS-I | 1.5 fix | 0.39 ± 0.02 | 0.56 ± 0.06 | |||||
| 2007-09-06 | PN | GC-4 | 1.5 fix | 0.40 ± 0.07 | 0.61 ± 0.10 | ||||
| 7 | CXOGC J174535.5–290124 | 30.4 ± 8.6 | 0.90 (57) | ||||||
| unclassified | 2005-10-20 | HRC-I | GC-2 | 2.0 fix | 0.33 ± 0.30 | 1.34 ± 1.10 | |||
| 2006-09-08 | PN | GC-2 | 1.7 ± 0.8 | 0.93 ± 0.81 | 3.12 ± 2.12 | ||||
| 2007-03-12 | ACIS-I | 2.0 fix | 0.60 ± 0.11 | 2.06 ± 0.38 | |||||
| 2007-04-06 | ACIS-I | 2.0 fix | 0.65 ± 0.12 | 2.25 ± 0.37 | |||||
| 2007-04-18 | ACIS-I | 2.0 fix | 0.60 ± 0.11 | 2.06 ± 0.38 | |||||
| 2007-04-30 | ACIS-I | 2.0 fix | 0.43 ± 0.06 | 1.50 ± 0.17 | |||||
| 2008-05-10 | HRC-I | GC-2 | 2.0 fix | 0.33 ± 0.30 | 1.34 ± 1.10 | ||||
| 2008-07-15 | HRC-I | GC-2 | 2.0 fix | 0.35 ± 0.28 | 1.36 ± 1.08 | ||||
| 2008-09-23 | PN | GC-2 | 2.5 ± 1.2 | 0.53 ± 0.84 | 2.84 ± 1.53 | ||||
| 8 | CXOGC J174541.0–290014 | 2005-10-20 | HRC-I | GC-2 | 18.8 fix | 2.0 fix | 0.55 ± 0.28 | 1.40 ± 0.70 | |
| unclassified | |||||||||
| 9 | XMMU J174654.1–291542 | 5.2 ± 1.2 | 1.07 (159) | ||||||
| likely weak persistent | 2006-02-27 | PN | GC-6 | 0.3 ± 0.3 | 2.48 ± 0.10 | 3.02 ± 0.17 | |||
| 2006-09-08 | PN | GC-6 | 1.8 ± 0.5 | 0.72 ± 0.21 | 1.06 ± 0.11 | ||||
| 2007-09-06 | PN | GC-6 | 0.7 ± 0.4 | 1.02 ± 0.25 | 1.29 ± 0.11 | ||||
| 2008-03-04 | PN | GC-6 | 1.3 ± 0.4 | 1.04 ± 0.15 | 1.43 ± 0.12 | ||||
| 2008-09-27 | PN | GC-6 | 1.7 ± 0.5 | 0.65 ± 0.14 | 0.93 ± 0.07 | ||||
| 10 | AX J1742.6–2901 | 2008-07-16 | HRC-I | GC-5 | 1.6 fix | 2.9 fix | 0.22 ± 0.08 | 0.27 ± 0.10 | |
| likely weak persistent | |||||||||
Notes. Quoted errors represent 90% confidence levels. FX,abs and FX,unabs denote the absorbed and unabsorbed 2–10 keV model fluxes. The hydrogen column density of XMM J174457–2850.3 (#6) was fixed to the value reported by Degenaar & Wijnands (2009). For CXOGC J174541.0–290014 (#8) we adopted the spectral parameters given by Muno et al. (2004) and for AX J1742.6–2901 (#10) those reported by Degenaar et al. (2012), since these objects were only detected in our Chandra/HRC observations.
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