VLBI observations of GRB 201015A, a relatively faint GRB with a hint of very high-energy gamma-ray emission

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Table 1

Radio observations performed with the VLA, e-MERLIN, and EVN in the L and C bands.

Date	UTC (hh:mm)	T−T₀ (days)	T_s (h)	v (GHz)	Peak brightness (μJy beam⁻¹)	r.m.s. [μJy/beam⁻¹]	Array	Beam size
2020/10/17	8:58−9:38	1.4	0.7	4.23−7.10	132	5	VLA	1.70″× 1.14″
2020/11/04	21:25−06:30	20	9.2	1.25−1.76	213	34	e-MERLIN	0.18″× 0.12″
2020/11/05	20:35−14:00	21	6.1	4.50−5.01	107	17	e-MERLIN	0.06″ × 0.04″
2020/11/07	22:00−11:40	23	14	1.25−1.76	261	40	e-MERLIN	0.19″ × 0.12″
2020/11/08	23:30−08:30	24	3.9	4.50−5.01	116	26	e-MERLIN	0.06″ × 0.04″
2020/11/09	13:00−23:00	25	4.2	4.57−5.11	85	9	EVN	1.8 mas × 0.9 mas
2020/12/01	13:00−23:00	47	4.4	4.77−5.05	73	10	EVN	3.4 mas × 2.8 mas
2020/12/14	09:18−12:43	60	1.4	6.55−7.06	–	43	e-MERLIN	0.12″× 0.07″
2021/01/08	12:34−03:10	85	6.9	4.50−5.01	–	19	e-MERLIN	0.04″ × 0.04″
2021/01/23	17:35−08:55	100	8.9	4.50−5.01	–	16	e-MERLIN	0.07″ × 0.03″
2021/01/24	11:00−01:20	101	14	1.25−1.76	–	57	e-MERLIN	0.17″× 0.14″
2021/02/09	13:00−18:00 & 06:00−11:00	117	5.0	4.77−5.05	–	13	EVN	3.1 mas × 3.6 mas

Notes. T−T₀ is the total time from the GRB trigger to half of the observation, while T_s is the total time on source. The 1σ r.m.s. noise shown does not include the systematic flux density uncertainty (which we consider as 5% for the VLA and 10% for e-MERLIN and EVN throughout the work).

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