Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43l..69y&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 6, 1991, p. L69-L75. Research sponsored by DOE.
Astronomy and Astrophysics
Astronomy
21
Cyclotron Radiation, Gamma Ray Bursts, Line Spectra, Neutron Stars, Red Shift, Spectrum Analysis, Gravitational Effects, Japanese Space Program, Satellite Observation, Satellite-Borne Instruments
Scientific paper
The Gamma-Ray Burst Detector on the Ginga satellite has observed new cyclotron line features in the spectra of a gamma-ray burst which occurred on 1989 September 29 (GB890929). A spectral analysis also showed double line features. The best-fit gave a cyclotron-energy of EB = 24.1 +/- 0.9 keV, which corresponds to a magnetic field of B = (2.08 +/- 0.08) (1 + z) x 10 exp 12 gauss, where z represents the gravitational redshift. The electron column density for the line-forming region is estimated to be (1.8 +/- 0.5) x 10 exp 21/sq cm. These features were similar to those seen in the bursts previously observed with Ginga. So far, cyclotron features have been detected in three bursts out of 23 events of which Ginga measured reasonably significant spectra.
Fenimore Edward E.
Kondo Ichiro
Murakami Toshio
Nishimura Jun
Yoshida Atsumasa
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