Table 4.
Summary of the Swift-XRT observations of PKS 2155−304.
| Epoch | Start | Stop | Obs. ID | Exposure | Ct. rate | Flux2−10keV | Γ | χ2/PHA |
|---|---|---|---|---|---|---|---|---|
| [ks] | [cts s−1] | [10−11 erg cm−2 s−1] | ||||||
| 1 | 2013-07-17 00:06:58 | 2013-07-17 02:41:34 | 00080280001 | 1.6 | 1.67 | 1.7 ± 0.1 | 2.43 ± 0.06 | 79.0/77 |
| 2 | 2013-08-03 00:20:59 | 2013-08-03 02:50:45 | 00080280002 | 2.1 | 2.56 | 1.9 ± 0.1 | 2.63 ± 0.05 | 118.2/124 |
| 3 | 2013-08-08 23:06:59 | 2013-08-09 00:21:47 | 00080280003 | 1.7 | 1.36 | 1.0 ± 0.1 | 2.71 ± 0.07 | 64.8/65 |
| 4 | 2013-09-28 22:50:59 | 2013-09-29 00:06:47 | 00080280015 | 1.6 | 1.07 | 0.8 ± 0.1 | 2.69 ± 0.08 | 40.8/53 |
| 5 | 2013-06-05 19:37:59 | 2013-06-05 20:43:12 | 00030795109 | 0.9 | 1.61 | 1.4 ± 0.2 | 2.57 ± 0.09 | 45.4/45 |
| 7 | 2013-08-14 23:15:45 | 2013-08-15 02:13:48 | 00080280006 and −08 | 1.8 | 2.32 | 2.0 ± 0.1 | 2.59 ± 0.05 | 89.2/108 |
| 8 | 2013-08-26 20:17:59 | 2013-08-26 23:06:38 | 00080280009 | 1.0 | 3.1 | 3.4 ± 0.2 | 2.38 ± 0.06 | 68.1/85 |
| 9 | 2013-09-05 04:33:59 | 2013-09-05 05:39:41 | 00080280013 | 0.9 | 0.85 | 1.5 ± 0.2 | 2.65 ± 0.10 | 17.2/28 |
Notes. The first columns are the epoch number, the start and stop time of the observation, and the corresponding ID. The observation length, the count rate, and the derived spectral parameters (integrated model flux and photon index) are given in subsequent columns. The last column is the χ2 over the number of PHA bins (PHA). For the power-law model, the number of degrees of freedom is two less than the number of PHA bins.
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