Precursors in tidal disruption events: Repeating, fast, and active galactic nucleus-hosted TDEs

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Table A.1.

Precursor sample.

ID	TDE type	t_occ.time	precursor ref.	log(M_BH/M_⊙)	M_BH ref.	p	p ref.
		(days)
AT2019azh	repeating	18 ± 4	Huang et al. (2024), Faris et al. (2024)	6.24 ± 0.30	Mummery et al. (2024)
AT2024pvu	repeating	39 $_{- 7}^{+ 3}$ $Mathematical equation: $ ^{+3}_{-7} $$	this work	7.13 ± 0.80	this work
AT2022dbl	repeating	18 ± 3	this work	6.21 ± 0.52	this work
AT2023uqm	repeating	105 $_{- 30}^{+ 23}$ $Mathematical equation: $ ^{+23}_{-30} $$	this work, Wang et al. (2025)	7.14 ± 0.55	Wang et al. (2025)
AT2020wey	fast	11 ± 3	Charalampopoulos et al. (2023)	5.20 ± 0.52	Mummery et al. (2024)	−2.84 ± 0.18	Charalampopoulos et al. (2023)
AT2023lli	fast	39 $_{- 9}^{+ 16}$ $Mathematical equation: $ ^{+16}_{-9} $$	Huang et al. (2024)	6.66 ± 0.34	this work	−4.1	Huang et al. (2024)
AT2019qiz	fast	10 ± 2	Wang et al. (2024b)	6.35 ± 0.30	Mummery et al. (2024)	−2.51 ± 0.03	Charalampopoulos et al. (2023)
AT2019mha	fast	24 ± 7	Wang et al. (2024b)	6.71 ± 0.80	Mummery et al. (2024)	$- 4 . 0_{- 0.5}^{+ 0.7}$ $Mathematical equation: $ -4.0^{+0.7}_{-0.5} $$	van Velzen et al. (2021)
AT2020zso	fast? TDE-AGN	8 $_{- 2}^{+ 4}$ $Mathematical equation: $ ^{+4}_{-2} $$	Wang et al. (2024b)	6.06 ± 0.30	Mummery et al. (2024)	$- 2 . 12_{- 0.41}^{+ 0.28}$ $Mathematical equation: $ -2.12^{+0.28}_{-0.41} $$	Hammerstein et al. (2023)
AT2022fpx	TDE-AGN	> 125	Koljonen et al. (2024)	6.62 ± 0.58	Koljonen et al. (2024)
AT2018gn	TDE-AGN	30 ± 5	Wang et al. (2024b)	6.46 $_{- 0.48}^{+ 0.38}$ $Mathematical equation: $ ^{+0.38}_{-0.48} $$	Wang et al. (2024b)
AT2024kmq	TDE-AGN	48 ± 10	Ho et al. (2025)	8.04 ± 0.30	this work
AT2019ahk	TDE-AGN	32 ± 5a	Wang et al. (2024b)	6.80 ± 0.80	Holoien et al. (2019)
AT2019aalc	repeating TDE-AGN	364 $_{- 45}^{+ 81}$ $Mathematical equation: $ ^{+81}_{-45} $$	this work	7.23 ± 0.30	van Velzen et al. (2024)
AT2021aeuk	repeating TDE-AGN	239 $_{- 20}^{+ 62}$ $Mathematical equation: $ ^{+62}_{-20} $$	Sun et al. (2025)	7.30 $_{- 0.31}^{+ 0.18}$ $Mathematical equation: $ ^{+0.18}_{-0.31} $$	Bao et al. (2024)
ASASSN-14ko	repeating TDE-AGN	∼ 20 b	Huang et al. (2025)	7.86 $_{- 0.41}^{+ 0.31}$ $Mathematical equation: $ ^{+0.31}_{-0.41} $$	Payne et al. (2021)

Notes.t_occ.time denotes the occurrence time of the precursor relative to the primary peak, while the associated uncertainties represent the precursor duration. The parameter p gives the power-law index of the bolometric light curve decay for fast TDEs.

The precursor appears only in the bolometric light curve.

The precursors appear on different timescales across different flaring episodes.

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