35 research outputs found
Unusual Burst Emission from the New Soft Gamma Repeater SGR1627-41
In June-July,1998 the Konus-Wind burst spectrometer observed a series of
bursts from the new soft gamma repeater SGR1627-41. Time histories and energy
spectra of the bursts have been studied, revealing fluences and peak fluxes in
the ranges of 3x10^{-7} - 7.5x10^{-6} erg cm^{-2} and 10^{-5} - 10^{-4}erg
cm^{-2}/s respectively. One event, 18 June 6153.5sUT stands out dramatically
from this series. Its fluence is ~7x10^{-4} erg cm^{-2} and peak flux
~2x10^{-2} erg cm^{-2}/s. These values from a source at a distance of 5.8 kpc
yield an energy output of ~3x10^{42}erg and maximum luminosity of ~8x10^{43}
erg/s, similar to the values for the famous March 5, 1979 and August27,1998
events. In terms of energy, this event is another giant outburst seen in a
third SGR! However, this very energetic burst differs significantly from the
other giant outbursts. It exhibits no separate initial pulse with a fast rise
time, no extended tail, and no pulsations. It is rather similar to ordinary
repeated bursts but is a few hundred times stronger in intensity. According to
the magnetar model by Thompson and Duncan (1995) such a burst may be initiated
by a strong starquake when a crust fracture propagates over the whole surface
of a neutron star.Comment: 7 pages, 5 figures. To be appeared in ApJ
On the Fast Spectral Variability of GRBs
Fast spectral variability of gamma-ray burst emission is considered for a
number of events seen by the Konus-Wind experiment. The variability manifests
itself as a strong correlation between instantaneous energy flux and peak
energy . In the () plane, the correlation produces distinct tracks
in the form of branches and loops representing the different parts of a burst
time history. Despite the variety of features seen in different events, the
main characteristics of the spectral evolution produce a quite consistent
pattern.Comment: 3 pages with 2 figures; to appear in the Proceedings of the workshop
"Gamma-Ray Bursts in the Afterglow Era: 2nd Workshop", held in Rome, October
17-20, 200
A Stimulus to High Quality (Instructive Economic Experiment at Sverdlovsk Plants)
The strength of our economic system lies in the unity of interests of the state and the enterprise, of the entire collective and each working person. However, economic conditions still exist that restrain the initiative of staffs in the struggle to improve the quality of output.