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Table 4

Log of all SwiftXRT observations use in this work.

Sequence Obs/Mode Start time (UT) End time (UT) Exposure N H Γ F 0.5−10 keV a /d.o.f.
(MJD) (MJD) (s) (1022 cm-2) (10-10 erg cm-2 s-1)
00569022000b XRT/WT 56 536.38578 56 536.40508 1668
00569022000 XRT/PC 56 536.44215 56 536.58503 5581 1.49±0.10 2.39±0.10 1.6±0.6 0.92/211c
00569022001 XRT/WT 56 536.58612 56 536.64248 395 1.2±0.2 2.3±0.3 1.26±0.09 1.11/145c
00569022001 XRT/PC 56 536.58623 56 536.67200 3698 1.5±0.2 2.4±0.2 1.14±0.06 1.11/145c
00569022002 XRT/WT 56 537.17595 56 537.37689 1412 1.4±0.2 2.3±0.2 1.11±0.106 0.91/186c
00569022002 XRT/PC 56 537.17604 56 537.25757 2565 1.4±0.2 2.1±0.2 1.1±0.1 0.91/186c
00569022003d XRT/WT 56 537.64302 56 537.71031 153 – – – –
00569022003 XRT/PC 56 537.64434 56 537.72605 3814 1.24±0.13 1.93±0.11 2.00±0.07 0.97/152
00569022004d XRT/WT 56 538.11015 56 538.33109 324 – – – –
00569022004 XRT/PC 56 538.11176 56 538.33635 3638 1.01±0.09 1.62±0.10 3.00±0.10 1.05/185
00569022006 XRT/WT 56 539.38610 56 539.45124 159 1.06±0.29 1.7±0.3 3.3±0.3 0.91/184c
00569022006 XRT/PC 56 539.38740 56 539.46243 2164 1.36±0.13 1.88±0.13 2.81±0.12 0.91/184c
00569022007 XRT/WT 56 540.51553 56 540.59720 1890 1.33±0.14 2.25±0.13 1.10±0.06 1.06/162
00569022008 XRT/WT 56 541.26421 56 541.27637 1024 1.6±0.3 3.0±0.3 0.34±0.03 1.04/40
00569022009 XRT/WT 56 542.73167 56 542.74373 1021 1.4 2.5 0.03 1.32/5
00032930001e XRT/WT 56 543.66528 56 543.67847 925 1.4 2.5 ~0.01 –
00032930002e XRT/WT 56 544.60000 56 544.61319 1068 1.4 2.5 ~0.005 –
00032930003f XRT/PC 56 545.60069 56 545.61389 1096 1.6 2.5 <0.005 –
00032930004f XRT/PC 56 546.32569 56 546.33889 973 1.6 2.5 <0.006 –
00032930005f XRT/PC 56 549.46944 56 549.88472 3814 1.6 2.5 <0.002 –
00032930006f XRT/PC 56 550.39653 56 550.54861 3936 1.6 2.5 <0.006 –
00032980001 XRT/PC 56 572.28104 56 572.30564 1973 1.6±0.2 2.3±0.2 1.68±0.07 1.14/76
00032980002 XRT/PC 56 573.22292 56 573.29167 1878 1.5±0.2 2.4±0.2 1.00±0.06 0.82/45
00032930007 XRT/WT 56 576.83264 56 576.84583 947 1.1±0.2 2.2±0.2 1.15±0.08 1.03/84
00032930008 XRT/WT 56 577.63889 56 577.65208 980 1.27±0.14 2.10±0.14 1.82±0.08 0.92/127
00032930009 XRT/WT 56 578.55903 56 578.57222 944 1.6±0.4 2.4±0.4 0.89±0.07 0.85/31
00032930010 XRT/WT 56 579.50069 56 579.51458 1126 1.26±0.14 2.06±0.12 1.87±0.08 1.05/152
00032930011 XRT/WT 56 580.63472 56 580.64931 1044 1.2±0.2 2.2±0.2 1.02±0.06 0.89/93
00032930013 XRT/WT 56 582.09583 56 582.10833 913 1.3±0.2 2.2±0.2 1.17±0.07 0.98/85
00032930014 XRT/WT 56 583.43056 56 583.44444 1064 1.15±0.11 2.04±0.11 2.21±0.07 0.88/159
00032930015 XRT/WT 56 584.56458 56 584.57847 1025 0.93±0.09 2.00±0.10 2.40±0.07 1.08/171
00032930016 XRT/WT 56 585.97014 56 585.98333 961 0.91±0.08 2.28±0.10 2.80±0.10 0.86/176
00032930017 XRT/WT 56 586.04097 56 586.05417 960 0.88±0.06 2.27±0.08 3.23±0.11 0.98/222
00032930018 XRT/WT 56 587.44236 56 587.45556 526 0.74±0.07 2.14±0.11 3.2 0.99/142
00032930019 XRT/WT 56 588.37708 56 588.51667 1049 0.94±0.05 2.36±0.07 4.63±0.10 0.89/292
00032930021 XRT/WT 56 594.45208 56 594.46458 946 0.76±0.05 2.27±0.08 3.00±0.08 1.06/221
00033239001f XRT/PC 56 763.28194 56 763.42292 2021 0.76 2.27 <0.004 –

Notes. For each observation we also report the results of the spectral fit carried out by using a simple absorbed power-law model (phabs*pow in xspec).

(a)

Observed flux (i.e., not corrected for absorption).

(b)

Analyzed separately (see Sect. 3 for details).

(c)

We fit the PC and WT spectrum together, leaving all parameters free to vary but obtaining a single d.o.f. from the fit.

(d)

Statistics was too poor to extract a meaningful spectrum.

(e)

The source was detected but too faint for the XRT WT mode. A rough estimate of the source flux is given from the recorded count rate and assuming the spectral model of the previous observation with good statistics.

(f)

The source was not detected and thus we used the spectral model of the preceding observation to derive a 3σ upper limit on the source X-ray flux.

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