Episode-wise spectropolarimetry of GRB 220107A: Testing the hypothesis of evolving radiation mechanisms

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Table 1.

Spectral fit results of GRB 220107A from Konus-Wind data.

Interval	Model	α	β	E_p (keV)	kT (keV)	Flux^a	χ²/d.o.f.
Time-integrated (0–98 s)	Band	−1.01 ± 0.07	$- 3 . 07_{unconstrained}^{+ 0.43}$ $Mathematical equation: $ -3.07^{+0.43}_{\mathrm{unconstrained}} $$	$227_{- 16}^{+ 17}$ $Mathematical equation: $ 227^{+17}_{-16} $$	–	$5 . 53_{- 0.55}^{+ 0.58}$ $Mathematical equation: $ 5.53^{+0.58}_{-0.55} $$	101.0/97
	CPL	−1.04 ± 0.06	–	$235_{- 12}^{+ 14}$ $Mathematical equation: $ 235^{+14}_{-12} $$	–	$5 . 07_{- 0.17}^{+ 0.18}$ $Mathematical equation: $ 5.07^{+0.18}_{-0.17} $$	101.6/98
	Band+BB	$- 0 . 96_{- 0.14}^{+ 0.22}$ $Mathematical equation: $ -0.96^{+0.22}_{-0.14} $$	$- 3 . 11_{unconstrained}^{+ 0.46}$ $Mathematical equation: $ -3.11^{+0.46}_{\mathrm{unconstrained}} $$	$234_{- 18}^{+ 24}$ $Mathematical equation: $ 234^{+24}_{-18} $$	$14 . 8_{- 4.5}^{unconstrained}$ $Mathematical equation: $ 14.8^{\mathrm{unconstrained}}_{-4.5} $$	$5 . 39_{- 0.57}^{+ 0.62}$ $Mathematical equation: $ 5.39^{+0.62}_{-0.57} $$	100.6/95
	CPL+BB	−1.00 ± 0.15	–	$243_{- 17}^{+ 22}$ $Mathematical equation: $ 243^{+22}_{-17} $$	$16 . 9_{- 16.6}^{+ 21.7}$ $Mathematical equation: $ 16.9^{+21.7}_{-16.6} $$	$4 . 98_{- 0.26}^{+ 0.22}$ $Mathematical equation: $ 4.98^{+0.22}_{-0.26} $$	101.0/96

Episode 1 (0–33 s)	Band	−0.96 ± 0.09	< − 3.55	$260_{- 16}^{+ 13}$ $Mathematical equation: $ 260^{+13}_{-16} $$	–	$5 . 31_{- 0.13}^{+ 0.32}$ $Mathematical equation: $ 5.31^{+0.32}_{-0.13} $$	133.2/97
	CPL	−0.96 ± 0.09	–	$260_{- 19}^{+ 23}$ $Mathematical equation: $ 260^{+23}_{-19} $$	–	$5 . 31_{- 0.26}^{+ 0.28}$ $Mathematical equation: $ 5.31^{+0.28}_{-0.26} $$	133.2/98
	Band+BB	−0.48 ± 0.37	< − 3.57	$270_{- 19}^{+ 23}$ $Mathematical equation: $ 270^{+23}_{-19} $$	13.7 ± 2.1	$4 . 61_{- 0.57}^{+ 0.54}$ $Mathematical equation: $ 4.61^{+0.54}_{-0.57} $$	130.7/95
	CPL+BB	$- 0 . 47_{- 0.38}^{+ 0.59}$ $Mathematical equation: $ -0.47^{+0.59}_{-0.38} $$	–	$270_{- 19}^{+ 23}$ $Mathematical equation: $ 270^{+23}_{-19} $$	13.7 ± 2.1	$4 . 60_{- 0.56}^{+ 0.55}$ $Mathematical equation: $ 4.60^{+0.55}_{-0.56} $$	130.0/96

Episode 2 (66–98 s)	Band	−0.97 ± 0.07	$- 2 . 68_{- 0.25}^{+ 0.17}$ $Mathematical equation: $ -2.68^{+0.17}_{-0.25} $$	$195_{- 10}^{+ 11}$ $Mathematical equation: $ 195^{+11}_{-10} $$	–	$10 . 3_{- 0.7}^{+ 0.8}$ $Mathematical equation: $ 10.3^{+0.8}_{-0.7} $$	106.3/97
	CPL	−1.03 ± 0.06	–	210 ± 11	–	$8 . 66_{- 0.26}^{+ 0.27}$ $Mathematical equation: $ 8.66^{+0.27}_{-0.26} $$	112.2/98
	Band+BB	$- 0 . 72_{- 0.20}^{+ 0.29}$ $Mathematical equation: $ -0.72^{+0.29}_{-0.20} $$	$- 2 . 68_{- 0.23}^{+ 0.17}$ $Mathematical equation: $ -2.68^{+0.17}_{-0.23} $$	189 ± 11	$6 . 97_{- 3.05}^{+ 1.96}$ $Mathematical equation: $ 6.97^{+1.96}_{-3.05} $$	$9 . 87_{- 0.76}^{+ 0.82}$ $Mathematical equation: $ 9.87^{+0.82}_{-0.76} $$	103.8/95
	CPL+BB	$- 1 . 45_{- 0.16}^{+ 0.18}$ $Mathematical equation: $ -1.45^{+0.18}_{-0.16} $$	–	$275_{- 48}^{+ 94}$ $Mathematical equation: $ 275^{+94}_{-48} $$	41.8 ± 3.6	$7 . 87_{- 0.51}^{+ 0.53}$ $Mathematical equation: $ 7.87^{+0.53}_{-0.51} $$	106.6/96

Notes. Results are shown for the time-averaged prompt emission (0–98 s), episode 1 (0–33 s), and episode 2 (66–98 s) of GRB 220107A. Quoted uncertainties correspond to the 1σ confidence level. ^aFluxes are quoted in units of 10⁻⁷ erg cm⁻² s⁻¹ over 10 keV–10 MeV.

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