The expansion of the GRB 221009A afterglow | Astronomy & Astrophysics (A&A)

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Volume 690 (October 2024)

A&A, 690 (2024) A74

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Table 1.

Log table of our VLBI campaign and summary results of circular Gaussian fits to source visibilities.

Code	Date	Time	t_obs − t₀	Array	ν_obs	b_maj^( † )	b_min^( † )	b_p.a.^( † )	Phase Calibrator	r.m.s. ^( † )	F_ν^( ⋆ )	FWHM ^( ⋆ )	⟨β_app⟩ ^( ⋆ )
		[hh:mm UT]	[days]		[GHz]	[mas]	[mas]	[deg]		[μJy/b]	[mJy]	[mas]	c
RG013 B	2022-11-18	09:30–13:30	40	EVN	8.1–8.6	1.4	0.45	11	J1905+1943	67	$1 . 02_{- 0.05}^{+ 0.05}$ ${1.02_{-0.05}^{+0.05}}$	${0.12}_{- 0.07}^{+ 0.05}$ ${{0.12}^{+0.05}_{-0.07}}$	${5.5}_{- 3.2}^{+ 2.5}$ ${{5.5}^{+2.5}_{-3.2}}$
RG013 C	2022-11-21	09:30–13:30	43	EVN	4.6–5.1	3.7	0.69	11	J1905+1943	16	$1 . 42_{- 0.03}^{+ 0.03}$ ${1.42_{-0.03}^{+0.03}}$	< 0.20	< 8.7
BA160 B	2022-11-22, 23	19:58–00:58	44	VLBA	14.9–15.3	1.4	0.40	−9	J1905+1943	130	$0 . 80_{- 0.07}^{+ 0.08}$ ${0.80_{-0.07}^{+0.08}}$	${0.27}_{- 0.06}^{+ 0.05}$ ${{0.27}^{+0.05}_{-0.06}}$	${11.3}_{- 2.3}^{+ 2.1}$ ${{11.3}^{+2.1}_{-2.3}}$
BA160 C	2023-01-31	15:15–20:14	114	VLBA	14.9–15.3	1.4	0.58	3.5	J1905+1943	66	$0 . 27_{- 0.05}^{+ 0.06}$ ${0.27_{-0.05}^{+0.06}}$	${0.45}_{- 0.19}^{+ 0.19}$ ${{0.45}^{+0.19}_{-0.19}}$	${7.4}_{- 3.0}^{+ 3.1}$ ${{7.4}^{+3.1}_{-3.0}}$
RG013 D	2023-02-03	05:30–11:30	117	EVN	4.6–5.1	7.1	0.9	7.8	J191142+1952	10	$0 . 47_{- 0.03}^{+ 0.03}$ ${0.47_{-0.03}^{+0.03}}$	${0.35}_{- 0.12}^{+ 0.09}$ ${{0.35}^{+0.09}_{-0.12}}$	${5.6}_{- 1.9}^{+ 1.4}$ ${{5.6}^{+1.4}_{-1.9}}$
RG013 E	2023-02-04	05:30–11:30	118	EVN	8.1–8.6	1.4	0.59	10	J191142+1952	21	$0 . 59_{- 0.06}^{+ 0.07}$ ${0.59_{-0.06}^{+0.07}}$	${0.39}_{- 0.07}^{+ 0.06}$ ${{0.39}^{+0.06}_{-0.07}}$	${6.2}_{- 1.0}^{+ 0.9}$ ${{6.2}^{+0.9}_{-1.0}}$
BA160 C1	2023-05-02	10:17–15:16	205	VLBA	14.9–15.3	1.5	0.51	−10	J1905+1943	35	$0 . 33_{- 0.07}^{+ 0.09}$ ${0.33_{-0.07}^{+0.09}}$	${1.39}_{- 0.42}^{+ 0.48}$ ${{1.39}^{+0.48}_{-0.42}}$	${12.6}_{- 3.8}^{+ 4.3}$ ${{12.6}^{+4.3}_{-3.8}}$
RG013 F	2023-06-27, 28	19:30–02:36	261	EVN	4.8–5.1	1.8	1.5	62	J191142+1952	10	$0 . 16_{- 0.01}^{+ 0.01}$ ${0.16_{-0.01}^{+0.01}}$	${0.42}_{- 0.17}^{+ 0.12}$ ${{0.42}^{+0.12}_{-0.17}}$	${3.0}_{- 1.2}^{+ 0.9}$ ${{3.0}^{+0.9}_{-1.2}}$
BA160 D	2023-06-28	04:08–09:19	262	VLBA	14.9–15.3	1.7	0.57	−3	J1905+1943	37	$0 . 19_{- 0.07}^{+ 0.19}$ ${0.19_{-0.07}^{+0.19}}$	< 9.3	< 66

Notes. ^( † )Beam major axis, minor axis, position angle, r.m.s. noise level with natural weights. ^( ⋆ )Median and 68% confidence interval of the flux density F_ν and full width at half maximum FWHM from fitting a circular Gaussian to the source visibilities; and of the average apparent expansion speed ⟨β_app⟩, assuming zero size at t₀. If the lower extremum of the 68% credible interval is 0, we report the 95% upper limit instead.

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