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Line strength variations in gamma-ray bursts GB870303 - Possible evidence of neutron star rotationAn exhaustive search of the Ginga data on gamma-ray burst GB870303 reveals two separate time intervals during which statistically significant line features are evident. One (previously unreported) interval shows a single prominent line feature at about 20 keV; a second, corresponding to the interval reported by Murakami et al. (1988), shows two line features at 20 and 40 keV. From model fits to the data, we find that both sets of lines are well-described by cyclotron resonant scattering in a magnetic field B around 1.8 x 10 exp 12 G, and that the differences in the line strengths between the two intervals are significant. The variations are qualitatively similar to those produced by a change in the viewing angle theta relative to the magnetic field. We conjecture that the change in theta is due to rotation of the neutron star, and derive limits of 45-180 sec on the rotation period P.
Document ID
19930056090
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Graziani, C.
(NASA Headquarters Washington, DC United States)
Fenimore, E. E.
(Los Alamos National Lab. NM, United States)
Murakami, T.
(Inst. of Space and Astronautical Science Sagamihara, Japan)
Yoshida, A.
(Inst. of Physical and Chemical Research Wako, Japan)
Lamb, D. Q.
(Chicago Univ. IL, United States)
Wang, J. C. L.
(Toronto Univ. Canada)
Loredo, T. J.
(Cornell Univ. Ithaca, NY, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Gamma-ray bursts; Proceedings of the Workshop, Univ. of Alabama, Huntsville, Oct. 16-18, 1991 (A93-40051 16-93)
Publisher: American Institute of Physics
Subject Category
Astrophysics
Accession Number
93A40087
Funding Number(s)
CONTRACT_GRANT: NAG5-1177
CONTRACT_GRANT: NGT-50617
CONTRACT_GRANT: NAGW-830
CONTRACT_GRANT: NAGW-1284
Distribution Limits
Public
Copyright
Other

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