**Table B.1:** Observations in millimetre wavelengths from the Plateau du Bure interferometer (compact 6-antenna configuration on all dates). The errors are based on point-source fits in the UV plane to the phase center.
(t-t₀) (days)	Band (GHz)	Flux (mJ)	3- $\sigma$ limit (mJy)
3.23	86.789	0.0 $\pm$ 0.3	0.9
3.23	229.068	1.0 $\pm$ 1.6	4.8
5.19	115.477	0.5 $\pm$ 0.8	2.5
5.19	232.295	3.3 $\pm$ 1.8	5.4
10.34	86.251	0.9 $\pm$ 0.3	0.9^a
10.34	232.171	8.4 $\pm$ 2.3	6.9^a
11.19	108.995	-1.7 $\pm$ 1.7	5.2
11.19	228.534	-9.9 $\pm$ 6.5	19.5
12.40	108.995	-0.9 $\pm$ 0.7	2.2
12.40	228.534	3.6 $\pm$ 2.7	8.2
14.29	111.619	-0.8 $\pm$ 0.4	1.3
14.29	224.680	1.4 $\pm$ 2.1	6.3

^a The faint detections found on this epoch are considered to be due to a statistical fluctuation or to an unusual event of interstellar scattering at high galactic latitud, taking into account the non detection the next night and the extreme spectral slope.

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