X-ray excesses in GRB spectra

Details X-ray excesses in GRB spectra X-ray excesses in GRB spectra

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..526..175p&link_type=abstract

GAMMA-RAY BURSTS: 5th Huntsville Symposium. AIP Conference Proceedings, Volume 526, pp. 175-179 (2000).

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Gamma-Ray Sources, Gamma-Ray Bursts, Cosmic Rays, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

The observation of X-ray excesses greater than 5 sigma above an assumed model spectrum in approximately 15% of 86 bright bursts observed by BATSE has been verified in recent work. We have looked at a further 64 events, and observe the same behavior of a 15% excess rate in the statistically-independent sample. We have examined the time-history of excesses for 10 bursts that had an overall greater than 8 sigma excess, in order to compare the behavior with other spectral parameters. In addition, we have looked at 17 bursts that exhibit no global excess, to determine the expected temporal variations in the BATSE low-energy data. .

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