X-ray and optical observations of the millisecond pulsar binary PSR J1431–4715

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Table 1.

Observing log of J1431.

Telescope	Instrument	Date	UT (start)	T_expo^(a)	Average rate (cts s⁻¹) ^(b)
XMM-Newton	EPIC-pn	2021-01-21	15:59:46	84.0 ks	8.46 ± 0.59 × 10⁻³
	EPIC-MOS1		15:28:05	84.4 ks	2.42 ± 0.30 × 10⁻³
	EPIC-MOS2		15:28:28	84.4 ks	2.09 ± 0.29 × 10⁻³
	OM-V		15:36:27	35.2 ks	1.01 ± 0.02(17.92 ± 0.02)
	OM-UVW1	2021-01-22	04:07:21	32.0 ks	0.26 ± 0.01(20.16 ± 0.03)

NTT	ULTRACAM u_s, g_s, r_s	2019-04-12	00:45:50	1540 × 20.2 ^(c) s	u_s = 19.18 ± 0.03, g_s = 17.85 ± 0.01, r_s = 17.77 ± 0.01
	ULTRACAM u_s, g_s, r_s	2019-04-13	03:59:31	1024 × 20.2 ^(c) s	u_s = 19.17 ± 0.03, g_s = 17.85 ± 0.01, r_s = 17.78 ± 0.01
	ULTRACAM u_s, g_s, i_s	2019-04-14	02:17:30	1203 × 20.2 ^(c) s	u_s = 19.17 ± 0.04, g_s = 17.85 ± 0.01, i_s = 17.67 ± 0.01

Notes.

^(a)

Effective exposure after removal of high background (EPIC) and bad OM centering in the fast window (OM) or poor data close to twilight (ULTRACAM). For ULTRACAM the number of frames and exposure of each frame are reported.

^(b)

Average rates in the 0.2−12 keV range for EPIC cameras. For the OM average rates and AB magnitudes in parenthesis are reported. For ULTRACAM nightly average AB magnitudes in the observed filters are reported.

^(c)

One third of frames, each three times the reported exposure (see text), were acquired in the u_s filter.

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