**Table 1:** Summary of the radio observations.
Telescope	RA $_{\rm J2000}$	Dec $_{\rm J2000}$	Observation	$\nu$	$\Delta \nu$	t	HPBW, PA	rms
	(h, m, s)	( $^{\circ }$ , $^{\prime}$ , $^{\prime \prime}$ )	date	MHz	MHz	min	(full array , `` $\times$ '', $^{\circ }$ )	$\mu$ Jy b^-1
GMRT	04 54 09.00	-10 14 19.0	Nov. 06	327	16 $\diamond$	330	10.6 $\times$ 9.6, -19	90-100*
VLA-BnA	04 54 16.28	-10 16 05.9	Jun. 06	4860	50	110	1.0 $\times$ 0.8, -68	10
VLA-CnB	04 54 16.28	-10 16 05.9	Oct. 06	4860	50	60	4.0 $\times$ 2.0, -82	15
VLA-BnA	04 54 16.28	-10 16 05.9	Jun. 06	8430	50	170	0.6 $\times$ 0.5, 82	8

$\diamond$ The observations were performed using a total bandwidth of 32 MHz (USB+LSB), but only the USB dataset was used for the analysis (see Sect. 2.1).
* The rms noise level in the region of the relic is $\sim$ 90 $\mu$ Jy b^-1, and increases up to $\sim$ 100 $\mu$ Jy b^-1 in the outer parts of the A 521 field due to the presence of strong radio sources.

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