Table 2

Summary table of all the observed X-ray flares of A0538−66 since its discovery.

Phase MJD Δt Satellite Reference
0.799 43 324.41 6 hr HEAO Skinner et al. (1980)
0.810 43341.23 2 hr HEAO Skinner et al. (1980)
0.905 43 376.10 14 d HEAO Skinner et al. (1980)
0.879 43 392.30 3 d HEAO Skinner et al. (1980)
0.813 43 424.48 0.6 d HEAO Skinner et al. (1980)
0.815 43 457.80 0.1-0.6 d HEAO Skinner et al. (1980)
0.811 43 507.64 ≈0.1 d HEAO Skinner et al. (1980)
0.850(a) 44589.90 Unknown Einstein Ponman et al. (1984)
0.800(a) 44638.99 Unknown Einstein Ponman et al. (1984)
0.978 48 219.56 12 h ROSAT Mavromatakis & Haberl (1993)
0.177(b) 48 239.50 10 d ROSAT Mavromatakis & Haberl (1993)
0.072(c) 49 752.00 >0.6 d ASCA Corbet et al. (1997)
0.964 58 253.25 ≈1 h XMM-Newton Ducci et al. (2019c)
0.966 58 269.92 ≈1 h XMM-Newton Ducci et al. (2019c)
0.290 58 990.87 ≥42.5 s eROSITA This work
0.930 59001.54 ≥8 h eROSITA This work

Notes. (a)At unknown. Outburst could be much longer than a few days. (b) Onset of the outburst at ϕorb ≈ 0. (c) MACHO data show a simultaneous optical outburst with a peak between 49 749.578 and 49 751.651 (ϕorb = 0.927−0.051).

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