Physics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aipc..265..211g&link_type=abstract
Gamma-ray bursts. AIP Conference Proceedings, Volume 265, pp. 211-215 (1991).
Physics
Gamma-Ray Sources, Gamma-Ray Bursts, Spectroscopy And Spectrophotometry, Neutron Stars
Scientific paper
An exhaustive search of the Ginga data on γ-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 ~=20 keV; a second, corresponding to the interval reported by Murakami et al., 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~=1.8×1012 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 θ relative the magnetic field. We conjecture that the change in θ is due to rotation of the neutron star, and derive limits 45 sec <~P<~180 sec on the rotation period P.
Fenimore Edward E.
Graziani Carlo
Lamb Don Q.
Loredo Thomas J.
Murakami Tadayoshi
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