Rapid onset of a Comptonisation zone in the repeating tidal disruption event XMMSL2 J140446.9-251135

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Table 2.

X-ray observation log of XMMSL2 J1404-2511.

Mission	Key^a	Date	Expos	Count rate^b
			(s)
ROSAT	R1	1991-01-07	320	< 0.033
XMM slew	XS1	2018-02-15	3.4	4.4 ± 1.1
Swift-XRT	S1	2018-02-28	2856	0.084 ± 0.006
Swift-XRT	S2	2018-03-07	3157	0.124 ± 0.007
Swift-XRT	S3	2018-03-12	1394	0.033 ± 0.007
Swift-XRT	S4	2018-03-19	3064	0.066 ± 0.006
Swift-XRT	S5	2018-03-26	950	0.16 ± 0.02
Swift-XRT	S6	2018-03-29	436	0.10 ± 0.02
Swift-XRT	S7	2018-04-07	682	0.11 ± 0.02
Swift-XRT	S8	2018-05-18	1148	0.084 ± 0.010
Swift-XRT	S9	2018-05-23	2788	0.096 ± 0.007
Swift-XRT	S10	2018-05-30	2883	0.104 ± 0.007
Swift-XRT	S11	2018-06-06	2928	0.060 ± 0.005
Swift-XRT	S12	2018-06-13	1427	0.023 ± 0.005
XMM pnt	X1	2018-07-17	32900	0.217 ± 0.003
Swift-XRT	S13-16^c	2018-09-02	8064	6.5 ± 3.3 × 10⁻⁴
Swift-XRT	S17	2018-12-17	2788	< 0.0020
XMM pnt	X2	2019-01-10	29874	3.5 ± 0.7 × 10⁻³
NuSTAR	N1	2019-01-10	68557	< 0.0024^d
XMM slew	XS2	2020-07-17	2.1	< 1.72
eROSITA	eRASS1	2020-01-26	321	0.23 ± 0.03^e
eROSITA	eRASS2	2020-07-28	320	0.09 ± 0.02
eROSITA	eRASS3	2021-01-20	222	< 0.02
eROSITA	eRASS4	2021-07-28	219	< 0.04
eROSITA	eRASS5	2022-01-26	232	0.25 ± 0.03
Swift-XRT	S18-21^f	2023-08-02	9991	< 0.00043
Swift-XRT	S22-23^g	2024-06-07	2420	< 0.0012

Notes.

^(a)

R=ROSAT survey, XS=XMM-Newton slew, S=Swift-XRT, X=XMM-Newton pointed, N=NuSTAR, eRASS=eROSITA survey.

^(b)

Detector count rate (counts/s) in the 0.2–2 keV energy band. Upper limits are 2-σ.

^(c)

Summation of 4 observations made on 2018-08-23, 2018-08-30, 2018-09-06, and 2018-09-11.

^(d)

Upper limit to the count rate from the combined FPA and FPB NuSTAR detectors in the energy band 3–20 keV.

^(e)

All eROSITA count rates and upper limits are background subtracted but have not been corrected for vignetting or encircled energy effects.

^(f)

Summation of 4 observations made on 2023-07-28, 2023-08-02, 2023-08-03, 2023-08-07.

^(g)

Summation of 2 observations made on 2024-06-04 and 2024-06-11.

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