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Table A.3.

Observation log of public Swift observations and the detected X-ray flares in 2016–2018.

Observations Flares
Mean
First Last Number Total exposure Nonflaring level (a) Number Start Stop Duration Count rate (b) Flux (c)
(UT) (UT) (ks) (count s−1) (UT) (UT) (s) (count s−1) (10−12 erg s−1 cm−2)
2016-02-06 20:58:58 2016-07-30 13:11:57 153 142.6 0.377 ± 0.089 1 2016-03-24 19:29:41 2016-03-24 19:43:54 853 0.483 ± 0.094 141.8 ± 27.6
– – – – 0.238 ± 0.065 2 2016-05-05 00:36:01 2016-05-05 00:43:53 472 0.300 ± 0.073 88.1 ± 21.4
– – – – 0.061 ± 0.024 3 (d) 2016-05-19 10:23:39 2016-05-19 10:39:40 961 0.116 ± 0.0.028 34.1 ± 8.2
– – – – 0.068 ± 0.015 4 (d) 2016-05-30 09:42:54 2016-05-30 09:58:54 960 0.080 ± 0.0.019 23.5 ± 5.6
2016-08-01 17:31:57 2016-11-01 07:06:58 78 75.4 0.028 ± 0.0001 ... ..................... ..................... ...... ............... ............
2017-02-02 23:31:57 2017-11-02 00:26:57 291 248.5 0.026 ± 0.0003 5 2017-06-12 15:59:41 2017-06-12 16:20:52 1271 0.096 ± 0.010 28.2 ± 2.94
2018-02-02 17:58:56 2018-11-02 04:27:57 233 222.7 0.025 ± 0.0003 6 2018-02-17 00:45:29 2018-02-17 01:01:52 983 0.069 ± 0.010 20.2 ± 2.94
– – – – – 7 2018-08-22 19:17:33 2018-08-22 19:29:53 740 0.083 ± 0.012 24.4 ± 3.52

Notes.

(a)

In the first part of 2016, it was impossible to determine a unique nonflaring level because of the activity of X-ray transients. We show the four nonflaring levels, associated with the four flares, computed as the mean count rate produced by the transients.

(b)

The flare mean count rates are background subtracted.

(c)

Mean unabsorbed flux between 2 and 10 keV determined for NH = 14.3 × 1022 cm−2 and Γ = 2.

(d)

These flares cannot be unequivocally attributed to Sgr A*. They are therefore ignored in the study of the flaring rate.

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