X-ray, optical, and radio follow-up of five thermally emitting isolated neutron star candidates

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Volume 705 (January 2026)

A&A, 705 (2026) A148

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Table 1.

Summary of follow-up observations.

XMM-Newton^(a)
Source	MJD^(b)	Counts^(c)	Background	Net count	GTI^(d)
			contribution^(c)	rate^(c)
	[days]		[%]	[10⁻² cts s⁻¹]	[s]

J0723	60402.37473	4135	8.3 ± 1.7	8.20(15)	51329
J0819	60073.48576	6892	10.0 ± 1.3	13.10(19)	54134
J0840	60237.30717	5413	7.3 ± 1.5	12.89(20)	43349
J1347	60163.26739	2919	12.5 ± 2.0	6.63(15)	42953
J1445	60185.36513	3193	8.7 ± 1.9	8.93(18)	36396

ESO-VLT

Source	MJD^(b)				T_exp
	[days]				[s]

J0723	60254.27166				4400
J0819	60076.98230				3200
J0840	60077.98398				3200
J1347	60082.13879				3600
J1445	60078.23744				4000

FAST

Source	MJD^(b)				T_exp
	[days]				[s]

J0819	60587.34583				1200
J0840	60559.43854				2700

Notes.

^(a)

Values for EPIC-pn only.

^(b)

Modified Julian date at mid-observation.

^(c)

Value given for the energy band of 0.2 − 12 keV.

^(d)

Remaining ‘good’ observing time intervals with data reduction steps applied and periods of high background activity screened (see text for details).

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