Flashing fast: Characterising the 2025 outburst of MAXI J1957+032

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Table A.2.

Best-fitting model continuum for each Swift/XRT observation of MAXI J1957+032.

Obs. ID	N_H	Γ	F_{0.5 − 10}	F_{0.5 − 2}	F_2 − 10	χ²/d.o.f.
	(10²¹ cm⁻²)		(10⁻¹⁰ erg cm⁻² s⁻¹)	(10⁻¹⁰ erg cm⁻² s⁻¹)	(10⁻¹⁰ erg cm⁻² s⁻¹)
00019768001	1.1 ± 0.2	$1 . 66_{- 0.06}^{+ 0.07}$ $1.66^{+0.07}_{-0.06}$	5.1 ± 0.2	1.8 ± 0.1	3.4 ± 0.2	92.23/93
00033770034	1.8 ± 0.1	1.85 ± 0.03	3.40 ± 0.05	1.39 ± 0.04	2.01 ± 0.05	263.99/242
00033770035	5 ± 1	2.8 ± 0.2	$0 . 51_{- 0.06}^{+ 0.08}$ $0.51^{+0.08}_{-0.06}$	$0 . 37_{- 0.07}^{+ 0.09}$ $0.37^{+0.09}_{-0.07}$	0.14 ± 0.02	20.26/24
00033770037	3.3 ± 0.5	2.7 ± 0.1	$0 . 45_{- 0.03}^{+ 0.04}$ $0.45^{+0.04}_{-0.03}$	$0 . 32_{- 0.03}^{+ 0.04}$ $0.32^{+0.04}_{-0.03}$	0.14 ± 0.01	54.19/50
00033770038	$4 . 2_{- 0.8}^{+ 0.9}$ $4.2^{+0.9}_{-0.8}$	2.8 ± 0.2	$0 . 34_{- 0.04}^{+ 0.05}$ $0.34^{+0.05}_{-0.04}$	$0 . 25_{- 0.04}^{+ 0.06}$ $0.25^{+0.06}_{-0.04}$	0.09 ± 0.01	13.65/20
00033770039^( ★ )	$7 . 2_{- 2.4}^{+ 2.9}$ $7.2^{+2.9}_{-2.4}$	3.2 ± 0.5	0.2 ± 0.1	0.2 ± 0.1	0.04 ± 0.01	–
00033770040^( ★ )	$2 . 1_{- 1.3}^{+ 1.6}$ $2.1^{+1.6}_{-1.3}$	$2 . 9_{- 0.4}^{+ 0.5}$ $2.9^{+0.5}_{-0.4}$	$0 . 06_{- 0.01}^{+ 0.02}$ $0.06^{+0.02}_{-0.01}$	$0 . 05_{- 0.01}^{+ 0.03}$ $0.05^{+0.03}_{-0.01}$	$0 . 015_{- 0.004}^{+ 0.005}$ $0.015^{+0.005}_{-0.004}$	–

Notes. N_H is the absorption column density, and Γ is the photon index. F_{0.5 − 10}, F_{0.5 − 2}, and F_2 − 10 are the unabsorbed fluxes estimated in the 0.5–10, 0.5–2, and 2–10 keV energy bands. ^( ★ ) Spectra grouped with 10 counts/bin and fitted using the Cash statistic (Sect. 2.3).

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