VLBI imaging of a flare in the Crab nebula: more than just a spot

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Table 1

Antenna parameters.

Antenna	D	λ_obs	SEFD	B_min–B_max
	[m]	[cm]	[Jy]	[km]

Effelsberg	100	6, 18	20,19	266–853
Westerbork	66^a	6, 18	60,30	266–1002
Jodrell Bank	25	6, 18	320,320	17–1388
Medicina	32	6, 18	170,600	757–1429
Onsala	25	6, 18	600,320	601–1429
Torun	32	6, 18	220,230	637–1441
Yebes	40	6	90	1313–2152
Cambridge^b	32	6	136	197–1313
Darnhall^b	25	18	356	17–1404
Knockin^b	25	18	356	67–1441
Hartebeesthoeck^c	26	18	450	7453–8525

Notes. ;

^(a)

for Westerbork operating as a phased array

^(b)

MERLIN antennas;

^(c)

Hartebeesthoeck was added ad hoc in the observation at 18 cm, while participating in the e-VLBI session on November 5. Column designation: D – antenna diameter; λ_obs – observing wavelength used; SEFD – system effective flux density describing the antenna sensitivity at corresponding wavelength; B_min–B_max – range of the telescope separations from a given antenna (for European telescopes, baselines to the South African antenna in Hartebeesthoeck are not considered).

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