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Table 2

Characteristics of the X-ray flares observed by XMM-Newton/EPIC in 2011.

Flare Day Start timea End timea Duration Totalb Peakc d
(#) (yy-mm-dd) (hh:mm:ss) (hh:mm:ss) (s) (cts) (count s-1) (1034 erg s-1)

1 2011-03-30 17:46:20.69 18:19:40.86 2000.16 211 ± 25 0.284 ± 0.013
2 2011-04-03 08:16:35.65 08:41:02.04 1457.67 ≥ 154 ± 24 0.165 ± 0.012 2.9

Notes. assuming a distance of 8 kpc, see Sect. 4 for details.


Start and end times (TT) of the flare time interval defined by the Bayesian-blocks algorithm (Scargle et al. 2013a) on the EPIC/pn data;


total EPIC/pn counts in the 210 keV energy band obtained in the smoothed light curve during the flare interval (determined by Bayesian blocks) after subtractingf the non-flaring level obtained with the Bayesian-blocks algorithm;


EPIC pn count rate in the 210 keV energy band at the flare peak (smoothed light curves) after subtracting the non-flaring level;


unabsorbed 210 keV average luminosity of the flare computed from the total counts collected during the flare (i.e., the average count rate) and

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