Table 4.
Best-fit parameters obtained using a broken power-law (BPL) and a power-law (PL) model fit to the X-ray light curves.
| FXRT | ID | T0(UTC) | Model | Tbreak(ks) | τ1 | τ2 | F0 (erg cm−2 s−1) | lnℒ(d.o.f.) | BIC |
|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
| Nearby extragalactic FXRT Candidates from CSC2 | |||||||||
| 1 | XRT 000519 | 2000-05-19 10:39:36.50 | BPL | – | – | – | – | – | – |
| PL | – | – | – | – | – | – | |||
| 2 | XRT 010908 | 2001-09-08 14:34:53.43 | BPL | 5.9 ± 0.1 | 0.04 ± 0.1 | 1.7 ± 0.3 | (3.6 ± 0.7) × 10−14 | 177.1(8) | −344.2 |
| PL | – | 0.3 ± 0.1 | – | (1.6 ± 1.2) × 10−13 | 168.9/10 | −332.7 | |||
| 3 | XRT 070530 | 2007-05-30 06:15:13.58 | BPL | 1.5 ± 0.1 | −0.1 ± 0.1 | 0.8 ± 0.2 | (1.9 ± 0.7) × 10−14 | 108.8(3) | −212.2 |
| PL | – | −0.2 ± 0.1 | – | (2.5 ± 1.5) × 10−14 | 108.0/5 | −209.9 | |||
| 4 | XRT 071203 | 2007-12-03 08:49:55.59 | BPL | – | – | – | – | – | – |
| PL | – | – | – | – | – | – | |||
| 5 | XRT 080331 | 2008-03-31 17:05:54.64 | BPL | – | – | – | – | – | – |
| PL | – | – | – | – | – | – | |||
| 6 | XRT 130822 | 2013-08-22 16:27:24.82 | BPL | 12.3 ± 1.2 | 0.2 ± 0.1 | 4.1 ± 0.1 | (6.1 ± 0.8) × 10−15 | 109.3(3) | −210.8 |
| PL | – | 0.3 ± 0.1 | – | (4.8 ± 2.9) × 10−14 | 107.4/5 | −210.8 | |||
| Distant extragalactic FXRT Candidates from CSC2 | |||||||||
| 7 | XRT 030511 | 2003-05-11 04:39:39.66 | BPL | 1.1 ± 0.1 | −0.2 ± 0.1 | 1.6 ± 0.1 | (1.4 × 0.1) × 10−12 | 719.3(53) | −1422.5 |
| PL | – | 0.4 ± 0.1 | – | (3.9 ± 2.1) × 10−12 | 611.1/51 | −1214.2 | |||
| 8 | XRT 041230 | 2004-12-30 15:40:07.36 | BPL | 23.8 ± 1.5 | −0.2 ± 0.1 | 2.0 ± 0.1 | (5.6 ± 0.5) × 10−15 | 95.7(2) | −184.1 |
| PL | – | −0.1±0.1 | – | (1.1 ± 0.6) × 10−15 | 94.9/4 | −186.3 | |||
| 9 | XRT 080819 | 2008-08-19 03:22:21.83 | BPL | 5.3 ± 0.2 | −0.2 ± 0.2 | 2.8 ± 1.9 | (1.8 ± 0.7) × 10−14 | 118.5(4) | −229.7 |
| PL | – | −0.1 ± 0.1 | – | (5.3 ± 5.0) × 10−15 | 116.7/6 | −228.1 | |||
| 10 | XRT 100831 | 2010-08-31 12:03:28.53 | BPL | 2.7 ± 0.3 | −0.0 ± 0.1 | 2.4 ± 0.4 | (2.0 ± 0.4) × 10−14 | 137.7(5) | −266.7 |
| PL | – | 0.4 ± 0.1 | – | (7.8 ± 6.6) × 10−14 | 131.4/7 | −258.4 | |||
| 11 | XRT 110103 | 2011-01-03 21:13:02.14 | BPL | – | – | – | – | – | – |
| PL | – | – | – | – | – | – | |||
| 12 | XRT 110919 | 2011-09-19 20:04:50.31 | BPL | 1.8 ± 0.2 | −0.0 ± 0.1 | 1.9 ± 0.2 | (2.0 ± 0.3) × 10−13 | 307.5(18) | −602.7 |
| PL | – | 0.5 ± 0.1 | – | (1.2 ± 0.8) × 10−12 | 286.8/20 | −567.5 | |||
| 13 | XRT 140327 | 2014-03-27 13:30:57.11 | BPL | 0.2 ± 0.2 | −1.4 ± 0.6 | 0.2 ± 0.3 | (1.5 ± 1.6) × 10−14 | 77.6(1) | −148.8 |
| PL | – | 0.2 ± 0.0 | – | (3.3 ± 0.7) × 10−14 | 77.8/3 | −152.4 | |||
| 14 | XRT 141001/ | 2014-10-01 07:04:26.20 | BPL | 0.2 ± 0.1 | −0.4 ± 0.1 | 1.6 ± 0.1 | (8.2 ± 1.2) × 10−13 | 393.9(25) | −774.3 |
| CDF-XT1 | PL | – | 0.7 ± 0.1 | – | (3.5 ± 2.5) × 10−12 | 357.5/27 | −708.2 | ||
Notes. Columns 1 and 2: FXRT# and ID of the candidate, respectively. Column 3: Time when the count rate is 3σ higher than the Poisson background level. Column 4: Model used. Column 5: Break time for the BPL model. Columns 6 and 7: Slope(s) for the BPL or PL model. Column 8: Normalization for the BPL or PL model. Columns 9 and 10: Log-likelihood (lnℒ)/degrees-of-freedom (d.o.f.) and Bayesian information criterion (BIC) of the fit, respectively. Errors are quoted at the 1σ confidence level.
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