Fig. 3

Time history of RXTE detected photon rate around the burst, at 8 s resolution. Photons detected with PCUs 1 and 2 have been combined. The dotted horizontal line shows the fit with a constant line to the data prior to the burst (with a best-fit value of 418 s-1). The burst lasts 550 ± 20 s. The inset zooms in on a 25 s stretch around the peak, at 1/8 s resolution.
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