GECAM discovery of a peculiar magnetar X-ray burst (MXB 221120) from SGR J1935+2154 associated with a fast radio burst

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Volume 707 (March 2026)

A&A, 707 (2026) A289

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Table 1.

Fitting results of the light curve.

Model				Parameters				$χ_{ν}^{2}$ $Mathematical equation: $ \chi^{2}_{\nu} $$ (d.o.f)	BIC
	A	t_max(ms)	σ₁(ms)	σ₂(ms)	ν	bkg
FRED
	49.5 $_{- 3.1}^{+ 3.5}$ $Mathematical equation: $ ^{+3.5}_{-3.1} $$	–41.9 $_{- 5.1}^{+ 5.2}$ $Mathematical equation: $ ^{+5.2}_{-5.1} $$	33.7 $_{- 5.1}^{+ 5.5}$ $Mathematical equation: $ ^{+5.5}_{-5.1} $$	173.0 $_{- 10.8}^{+ 11.4}$ $Mathematical equation: $ ^{+11.4}_{-10.8} $$	1.8 $_{- 0.3}^{+ 0.3}$ $Mathematical equation: $ ^{+0.3}_{-0.3} $$	27.5 $_{- 1.1}^{+ 1.1}$ $Mathematical equation: $ ^{+1.1}_{-1.1} $$		1.23 (114)	168.76

	A	t_max(ms)	σ₁(ms)	σ₂(ms)	ν	bkg	t_cut(ms)
ERCOD
	42.8 $_{- 2.2}^{+ 2.2}$ $Mathematical equation: $ ^{+2.2}_{-2.2} $$	–13.0 $_{- 22.0}^{+ 25.0}$ $Mathematical equation: $ ^{+25.0}_{-22.0} $$	65 $_{- 23}^{+ 26}$ $Mathematical equation: $ ^{+26}_{-23} $$	431 $_{- 67}^{+ 51}$ $Mathematical equation: $ ^{+51}_{-67} $$	4.1 $_{- 1.5}^{+ 2.5}$ $Mathematical equation: $ ^{+2.5}_{-1.5} $$	28.3 $_{- 0.8}^{+ 0.8}$ $Mathematical equation: $ ^{+0.8}_{-0.8} $$	165 $_{- 12}^{+ 11}$ $Mathematical equation: $ ^{+11}_{-12} $$	1.42 (113)	194.22

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