Table 1: Log of the X-ray observations of XRF 020427.
Instrument Band Seconds from Exposure Source counts Average 2-10 $\rm keV$ flux^a

(keV) XRF onset (s) ( $\rm erg~\rm cm^{-2}~\rm s1$ )

BeppoSAX/WFC 2-28 0-60 60 4774 $\pm$ 329 (9.7 $\pm$ 0.7) $\times$ 10^-9

BeppoSAX/MECS 1.6-10 40 320-55 080 6834 41 $\pm$ 9 (4.2 $\pm$ 0.9) $\times$ 10^-13

BeppoSAX/MECS 1.6-10 197 640-218 520 8044 <24^b <2.1 $\times$ 10^-13b

Chandra/ACIS-S^c 0.3-7 770 503-786 408 13 741 55 $\pm$ 8 (1.1 $\pm$ 0.2) $\times$ 10^-14

Chandra/ACIS-S^c 0.3-7 1 453 875-1 470 117 14 568 23 $\pm$ 6 (4.4 $\pm$ 1.2) $\times$ 10^-15

^a
Values computed by assuming the best fit spectral models (see Table 2 and text).
^b
3 $\sigma$ upper limits.
^c
The values here reported refer to CXOU J220928.2-651932 and were derived from
the Chandra public data archive (see also Sect. 3).

**Table 1:** Log of the X-ray observations of XRF 020427.
Instrument	Band	Seconds from	Exposure	Source counts	Average 2-10 $\rm keV$ flux^a
	(keV)	XRF onset	(s)		( $\rm erg~\rm cm^{-2}~\rm s1$ )
BeppoSAX/WFC	2-28	0-60	60	4774 $\pm$ 329	(9.7 $\pm$ 0.7) $\times$ 10^-9
BeppoSAX/MECS	1.6-10	40 320-55 080	6834	41 $\pm$ 9	(4.2 $\pm$ 0.9) $\times$ 10^-13
BeppoSAX/MECS	1.6-10	197 640-218 520	8044	<24^b	<2.1 $\times$ 10^-13b
Chandra/ACIS-S^c	0.3-7	770 503-786 408	13 741	55 $\pm$ 8	(1.1 $\pm$ 0.2) $\times$ 10^-14
Chandra/ACIS-S^c	0.3-7	1 453 875-1 470 117	14 568	23 $\pm$ 6	(4.4 $\pm$ 1.2) $\times$ 10^-15

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