Table 1
Sample of confirmed SFXTs: Positions and optical counterparts.
| Name | RA | Dec | Error | IR/Optical | Spectral | Distance | References | |||
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| (J2000) | (J2000) | counterpart | Type | (kpc) | Discovery | Position | Sp. Type | Distance | ||
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| IGR J08408−4503 | 08 40 47.83 | −45 03 31.1 | 1 6 |
HD 74194 | O8.5Ib(f) | 2.7 | 1 | 2 | 3 | 4 |
| IGR J11215−5952 | 11 21 46.9 | −59 51 46.9 | 11 |
HD 306414 | B0.7Ia | 6.2 | 5 | 6 | 7 | 8 |
| IGR J16328−4726 | 16 32 37.87 | −47 23 41.2 | 14 |
2MASS J16323791−4723409 | O8Iafpe | 3–10 | 9 | 10 | 11 | 12 |
| IGR J16418−4532 | 16 41 50.65 | −45 32 27.3 | 19 |
2MASS J16415078−4532253 | BN0.5Ia | 13 | 13 | 14 | 15 | 15 |
| IGR J16465−4507 | 16 46 35.5 | −45 07 04 | 4′′ | 2MASS J16463526−4507045 | B0.5Ib/O9.5Ia | 9.4/ |
16 | 17 | 18,15 | 15,19 |
| IGR J16479−4514 | 16 48 06.58 | −45 12 06.74 | 060 |
2MASS J16480656−4512068 | O8.5I | 4.9 | 20 | 21 | 15 | 15 |
| XTE J1739−302 | 17 39 11.58 | −30 20 37.6 | 06 |
2MASS J17391155−3020380 | O8Iab(f) | 2.7 | 22,23 | 24 | 25 | 15 |
| IGR J17544−2619 | 17 54 25.284 | −26 19 52.62 | 06 |
2MASS J17542527−2619526 | O9Ib | 3.6 | 26 | 27 | 28 | 15 |
| SAX J1818.6−1703 | 18 18 37.89 | −17 02 47.9 | 06 |
2MASS J18183790−1702479 | O9I-B1I | 2.1 ± 0.1 | 29 | 30 | 31 | 32 |
| AX J1841.0−0536 | 18 41 00.54 | −05 35 46.8 | 06 |
2MASS J18410043−0535465 | B1Ib |  ,6.9 ± 1.7 |
33,34 | 35 | 36 | 36,37 |
| AX J1845.0−0433 | 18 45 01.58 | −04 33 57.4 | 14 |
2MASS J18450159−0433565 | O9.5I | 3.6 | 38 | 10 | 39 | 39 |
| IGR J18483−0311 | 18 48 17.2 | −03 10 16.8 | 08 |
2MASS J18481720−0310168 | B0.5Ia/B0-B1Iab | 2.83 ± 0.05 | 40 | 41 | 15,32 | 32 |
Reference. (1) Götz et al. (2006); (2) Mangano et al. (2011); (3) Walborn (1973); (4) Leyder et al. (2007); (5) Lubinski et al. (2005); (6) Romano et al. (2007b); (7) Vijapurkar & Drilling (1993); (8) Masetti et al. (2006b); (9) Bird et al. (2007); (10) Romano et al. (2013); (11) Coleiro et al. (2013); (12) Fiocchi et al. (2013); (13) Tomsick et al. (2004); (14) Romano et al. (2012b); (15) Rahoui et al. (2008); (16) Lutovinov et al. (2004); (17) Walter et al. (2006); (18) Negueruela et al. (2007); (19) Nespoli et al. (2008); (20) Molkov et al. (2003); (21) Ratti et al. (2010); (22) Smith et al. (1997); (23) Smith et al. (1998); (24) Smith & Heindl (2004); (25) Negueruela et al. (2006a); (26) Sunyaev et al. (2003); (27) in’t Zand (2005); (28) Pellizza et al. (2006); (29) in’t Zand et al. (1998); (30) in’t Zand et al. (2006); (31) Negueruela & Schurch (2007); (32) Torrejón et al. (2010); (33) Bamba & Koyama (1999); (34) Bamba et al. (2001); (35) Halpern et al. (2004); (36) Nespoli et al. (2008); (37) Sguera et al. (2009); (38) Yamauchi et al. (1995); (39) Coe et al. (1996); (40) Chernyakova et al. (2003); (41) Giunta et al. (2009).
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