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Table 1.

Log of pointed X-ray observations, spectral parameters, and X-ray fluxes of J0840.

Instrument (a) Obs.ID Start Stop Exposure Count rate (b) kTBB RBB(c) FX, obs(d) FX, unabs(d) Th. fraction (e)
YYYY-MM-DD hh:mm:ss (TT) (ks) (counts s−1) (keV) (km) (×10−11 erg cm−2 s−1) (%)
Swift/XRT (WT) 00954304000 2020-02-05 06:38:33 2020-02-05 06:40:03 0.1 30.5 ± 0.6 1.55 ± 0.06 184 ± 7 216 ± 4 57 ± 5
Swift/XRT (WT) 00954304001 2020-02-05 07:52:25 2020-02-05 16:11:53 0.8 22.8 ± 0.2 1.16 ± 0.02 6.0 ± 0.3 123 ± 2 152 ± 2 45 ± 2
Swift/XRT (PC) 00954304001 2020-02-05 10:00:19 2020-02-05 16:17:53 2.7 0.52 ± 0.01 0.48 ± 0.03 3.0 ± 0.2 4.2 ± 0.2 25 ± 5
NICER/XTI 2201010101 2020-02-05 14:43:34 2020-02-05 21:09:00 1.3 2.15 ± 0.05 – – – –
Swift/XRT (PC) 00954304002 2020-02-06 11:13:26 2020-02-06 14:40:52 1.0 0.061 ± 0.008 0.32 ± 0.04 0.44 ± 0.07 0.7 ± 0.1 28 ± 12
NICER/XTI 2201010102 2020-02-06 15:27:10 2020-02-06 23:20:50 1.8 3.78 ± 0.05 – – – –
Swift/XRT (PC) 00954304005 2020-02-06 22:29:17 2020-02-07 03:02:50 3.3 0.176 ± 0.007 0.25 ± 0.05 0.90 ± 0.06 1.4 ± 0.1 15 ± 6
NICER/XTI 2201010103 2020-02-07 00:44:31 2020-02-07 21:03:51 7.2 1.52 ± 0.02 – – – –
Swift/XRT (PC) 00954304003 2020-02-07 14:12:57 2020-02-07 16:17:52 2.8 0.084 ± 0.006 0.30 ± 0.03 0.34 ± 0.03 0.53 ± 0.04 31 ± 7
NICER/XTI 2201010104 2020-02-08 03:02:14 2020-02-08 23:52:00 2.7 1.04 ± 0.03 – – – –
NuSTAR/FPMA 90601304002 2020-02-08 07:01:09 2020-02-09 06:56:09 42.4 0.050 ± 0.001 (f) 0.34 ± 0.05 0.25 ± 0.03 0.38 ± 0.04 29 ± 9
NuSTAR/FPMB 90601304002 2020-02-08 07:01:09 2020-02-09 06:56:09 41.5 0.045 ± 0.001 (f) 0.34 ± 0.05 0.25 ± 0.03 0.38 ± 0.04 29 ± 9
Swift/XRT (PC) 00954304004 2020-02-08 10:55:58 2020-02-08 17:36:53 3.8 0.060 ± 0.004 (f) 0.34 ± 0.05 0.25 ± 0.03 0.38 ± 0.04 29 ± 9
NICER/XTI 2201010105 2020-02-09 01:08:35 2020-02-09 23:06:40 12.7 0.86 ± 0.01 – – – –
Swift/XRT (PC) 00954304007 2020-02-09 07:33:15 2020-02-09 17:18:53 4.1 0.029 ± 0.003 0.12 ± 0.07 0.18 ± 0.02 0.34 ± 0.01 14 ± 9
Swift/XRT (PC) 00954304008–067 2020-02-10 13:52:00 2021-02-10 17:28:16 207.2 0.0028 ± 0.0001 (g) 0.11 ± 0.01 0.013 ± 0.001 0.035 ± 0.006 46 ± 6

Notes. The spectra were fitted using an absorbed blackbody plus power-law model, fixing the column density to NH = 4.6 × 1021 cm−2 and the photon index to Γ = 1.77 (see Sect. 3.3 for more details).

(a)

The instrumental setup is indicated in brackets: PC = photon counting, WT = windowed timing.

(b)

Average net count rate. It is in the 0.3−10 keV energy range, except for NICER (0.5−5 keV) and NuSTAR (3−20 keV).

(c)

The blackbody radius was calculated assuming a distance of 10 kpc.

(d)

All fluxes are in the 0.3−10 keV energy range.

(e)

The thermal fraction was evaluated as the ratio between the unabsorbed flux of the blackbody component and that of the total emission over the energy range 0.3−10 keV.

(f)

Datasets of these observations were fitted together.

(g)

Datasets of these observations (59 in total) were merged.

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