A phase-resolved Fermi-LAT analysis of the mode-changing pulsar PSR J2021+4026 shows hints of a multipolar magnetosphere

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Table 2.

Best-fit parameters of the timing model.

Parameter		A–B	B–C	C–D	D–E
MJD validity range	54 690.20 − 59 600.47
Reference MJD epoch	57 083.77
f^(a)	3.7689233(5)
ḟ^(b)	−7.77(5)
Glitch MJD epoch		55 850.00	57 000.00	58 150.00	59 010.00
Δ ḟ^(c)		−4.5(5)	4.7(5)	−1.9(5)	2.4(5)
Δḟ/ḟ^(d)		0.058(6)	−0.057(6)	0.024(6)	−0.030(6)
logℒ	6409.2

Notes. We report statistical errors on the last digit in parentheses.

^(a)

Frequency at the reference epoch, Hz.

^(b)

Frequency derivative at the reference epoch, 10⁻¹³ Hz s⁻¹.

^(c)

Change in ḟ at the glitch epoch, 10⁻¹⁴ Hz s⁻¹.

^(d)

Inferred relative change in ḟ computed at the glitch epoch.

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