Open Access

Table A.1.

Summary of observations.

Mission ObsID Date (start) Texp QPEs
Dec 2018 - May 2019 (O–C analysis)

XMM 0823680101 2018-12-24 60
XMM 0831790701 2019-01-16 130
Chandra 22096 2019-02-14 75
XMM 0851180401 2019-05-31 130

2023 XMM-Newton campaign

XMM 0914792701 2023-05-29 70
XMM 0914792901 2023-06-09 120
XMM 0914793101 2023-07-09 105

2024 XMM-Newton campaigna

XMM (8) 0943150101 2024-06-20 125 ×
XMM (8) ... ... ...
XMM (8) 0952390701 2024-07-18 30 ×

2024 Swift campaigna

Swift (23) 00097778002 2024-05-15 2.4 ×
Swift (23) ... ... ...
Swift (23) 00010450054 2024-09-09 1.8 ×

2024 NICER campaigna

NICER (8) 7672010401 2024-05-17 1.6 ×
NICER (8) ... ... ...
NICER (8) 7672011101 2024-08-25 3.6 ×

Notes. The last column indicates whether unambiguous QPEs were detected during the exposure (note that in many cases the exposures were too short to secure QPE detection). Texp is rounded and given in ks.

(a)For the 2024 monitoring campaigns by XMM-Newton, Swift, and NICER, we only report the first and last monitoring observation used here, while the number of monitoring observations is reported in parenthesis in the first column.

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