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Table 1

X-ray observation log of XMMSL1 J0740-85.

Missiona Date Exp timeb Fluxc uvw2 uvm2 uvw1 U B
(s) (10-12 ergs s-1 cm-2) mag mag mag mag mag
ROSAT 1990 368 <0.25
XMM slew 2012-08-01 3.9 <0.7
XMM slew 2014-03-24 2.0 <1.7
XMM slew 2014-04-01 10.3 4.9 ± 0.7
Swift 2014-04-14 2435 3.2 ± 0.21 16.35 ± 0.03
Swift 2014-04-22 2697 0.43 ± 0.21 16.49 ± 0.05
XMM pointed 2014-04-30 26 600 0.5 ± 0.15 16.59 ± 0.05 15.75 ± 0.01 15.52 ± 0.01
Swift 2014-05-05 1895 0.41 ± 0.12 16.80 ± 0.10 16.94 ± 0.08 16.63 ± 0.10
Swift 2014-05-12 2028 1.4 ± 0.12 17.07 ± 0.10 17.11 ± 0.10 16.66 ± 0.03
Swift 2014-05-19 1399 0.36 ± 0.12 17.14 ± 0.10 17.23 ± 0.20 16.76 ± 0.03
Swift 2014-05-26 509 0.35 ± 0.22
Swift 2014-05-31 1354 1.1 ± 0.12 17.10 ± 0.06 17.22 ± 0.07 16.68 ± 0.04
Swift 2014-07-04 954 0.40 ± 0.15 17.51 ± 0.3 17.52 ± 0.10 17.24 ± 0.40
Swift 2014-08-01 2482 0.41 ± 0.12 17.52 ± 0.08 17.77 ± 0.10 16.99 ± 0.03
Swift 2014-08-29 1651 0.16 ± 0.12 17.28 ± 0.10 17.45 ± 0.09 16.96 ± 0.04
Swift 2014-09-26 2485 0.33 ± 0.12 17.40 ± 0.05 17.56 ± 0.09 17.10 ± 0.08
Swift 2014-10-24 2073 0.20 ± 0.11 17.53 ± 0.05 17.58 ± 0.09 17.01 ± 0.04
Swift 2014-11-21 137 0.30 ± 0.24 17.54 ± 0.13
Swift 2014-11-26 2472 0.21 ± 0.14 17.55 ± 0.10 17.72 ± 0.15 16.98 ± 0.06
XMM pointed 2015-01-12 16 100 0.30 ± 0.01 17.2 ± 0.1 15.92 ± 0.01 15.60 ± 0.01
Swift 2015-09-20 1890 < 0.07 19.0 ± 0.3 18.88 ± 0.21 17.41 ± 0.20

Notes.

(a)

XMM-Newton, EPIC-pn camera: slew observations performed in full frame mode with the medium filter; pointed observations performed in full frame mode with the thin1 filter. Swift-XRT observations performed in pc mode. ROSAT sky survey data taken between 1990-08-12 and 1991-02-18.

(b)

Exposure time in seconds. For the two XMM pointed observations, this is the remaining exposure after removing times of high background flares.

(c)

Absorbed flux in the 0.2−2 keV band, calculated by fitting the spectrum of each observation with a two-component model of a power-law plus black-body absorbed by a Galactic column of 1.5 × 1021 cm-2. Upper limits have been calculated using a power-law model of slope 2.9 absorbed by the Galactic column.

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