Quasi-simultaneous XRT and BAT spectrum of the source at the onset of the outburst. The BAT spectrum is integrated for 113 s around the peak of the event, while the XRT spectrum is extracted from the first 30 s of the observation ID. 00569022000 (overlapping with the last part of the decaying BAT lightcurve; see Fig. 2). The best fit model is obtained with an absorbed blackbody model (/233). The fit gave NH = (0.7 ± 0.1)×1022 cm-2, kT = 2.4±0.1 keV, and RBB = 7.3 ± 0.5d7.2 kpc km. The residuals from the fit are shown in the bottom panel. The estimated 0.5−50 keV X-ray flux is 4.5 × 10-8 erg cm-2 s-1 (not corrected for absorption).
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