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Properties of the Second Outburst of the Bursting Pulsar (GRO J1744-28) as Observed with BASTEOne year after its discovery, the Bursting Pulsar (GRO J1744-28) went into outburst again, displaying the hard X-ray bursts and pulsations that make this source unique. We report on BATSE (Burst and Transient Source Experiment) observations of both the persistent and burst emission for this second outburst and draw comparisons with the first. The second outburst was smaller than the first in both duration and peak luminosity. The persistent flux, burst peak flux, and burst fluence were all reduced in amplitude by a factor of approximately 1.7. Despite these differences, the two outbursts were very similar with respect to the burst occurrence rate, the durations and spectra of bursts, the absence of spectral evolution during bursts, and the evolution of the ratio alpha of average persistent to burst luminosity. Although no spectral evolution was found within individual bursts, we find evidence for a small (20%) variation of the spectral temperature during the course of the second outburst.
Document ID
19990078586
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Woods, Peter M.
(Alabama Univ. Huntsville, AL United States)
Kouveliotou, Chryssa
(NASA Marshall Space Flight Center Huntsville, AL United States)
VanParadus, Jan
(Alabama Univ. Huntsville, AL United States)
Briggs, Michael S.
(Alabama Univ. Huntsville, AL United States)
Wilson, C. A.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Deal, Kim
(Alabama Univ. Huntsville, AL United States)
Harmon, B. A.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Fishman, G. J.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Lewin, W. H. G.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Kommers, J.
(Massachusetts Inst. of Tech. Cambridge, MA United States)
Date Acquired
August 19, 2013
Publication Date
May 20, 1999
Publication Information
Publication: Astrophysical Journal
Volume: 517
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: NAG5-4799
CONTRACT_GRANT: NCC8-65
CONTRACT_GRANT: NAG5-4419
CONTRACT_GRANT: NAG5-2755
CONTRACT_GRANT: NAG5-3674
CONTRACT_GRANT: NAG5-3003
Distribution Limits
Public
Copyright
Other
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