Continuation of the X-ray monitoring of Sgr A*: the increase in bright flaring rate confirmed

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Volume 636 (April 2020)

A&A, 636 (2020) A25

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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 N_H = 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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