The curious case of EP241021a: Unraveling the mystery of its exceptional rebrightening

Open Access

Table A.3.

Log of X-ray observations of EP241021a used in this work.

Start Time (UT)	δT(d)	Telescope	Instrument	Exposure (s)	Flux (erg cm⁻² s⁻¹)
2024-10-24T20:54:12	3.66	Swift	XRT	2770	< 2.5 × 10⁻¹³
2024-10-25T15:26:02	4.43	Swift	XRT	1380	< 3.9 × 10⁻¹³
2024-10-29T09:30:13	8.18	Swift	XRT	4385	$(1 . 4_{- 0.5}^{+ 0.6}) \times 10^{- 13}$ $(1.4^{+0.6}_{-0.5})\times 10^{-13}$
2024-11-03T02:22:02	12.88	Swift	XRT	3120	< 1.8 × 10⁻¹³
2024-11-05T20:21:02	15.63	Swift	XRT	1005	< 5.6 × 10⁻¹³
2024-11-07T02:13:02	16.88	Swift	XRT	3180	$(5 . 5_{- 0.3}^{+ 0.3}) \times 10^{- 14}$ $(5.5^{+0.3}_{-0.3})\times 10^{-14}$
2024-11-15T19:06:02	25.58	Swift	XRT	1710	$(7 . 9_{- 0.4}^{+ 0.6}) \times 10^{- 14}$ $(7.9^{+0.6}_{-0.4})\times 10^{-14}$

Notes. The unabsorbed flux is given in the 0.3 − 10 keV band. Additional X-ray observations of EP241021a are reported by Shu et al. (2025), Gianfagna et al. (2025), Yadav et al. (2025).

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