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HEAO Observations of X-ray bursts from MXB1730–335


BURST activity was observed1 on 18 March 1978, from MXB1730–335, the rapid burster, from which no activity had been observed a few days earlier2. HEAO 1 was pointed ( + y axis) at the rapid burster from 18.00–21.00 UT on 31 March 1978. The source was actively bursting in the ‘Mode I’ pattern3, in which very large type II bursts4 are first followed by a long (several minutes) quiescent period and then by a train of closely spaced, small bursts. Because type I and type II bursts probably have different underlying physical mechanisms4, it is important to study both types over a large energy range. We report here on a search for hard X-ray emission from the rapid burster and on evidence for spectral evolution in the type II bursts.

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HOFFMAN, J., WHEATON, W., PRIMINI, F. et al. HEAO Observations of X-ray bursts from MXB1730–335. Nature 276, 587–588 (1978).

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