Morphology of Hard X-ray Bursts from GRO J1744-28

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Since January 18, 1996, the Rossi X-ray Timing Explorer (RXTE) has conducted regular observations of the transient X-ray pulsar and burst source GRO J1744-28. We discuss the properties of >200 of the main bursts observed with RXTE during the two outbursts of this source. A quantitative analysis of the burst profiles demonstrates a strong correlation between the persistent emission level and the sizes of various burst features, and between the time scales of those features and that of the bursts themselves. An analysis of X-ray colors shows that the burst features are distinguishable by their X-ray spectra as well as by examination of the light curve. We suggest possible implications of these results for theories of the burst mechanism.

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