Spectroscopy of the Brightest Bursts up to Energies of 200MeV

Details Spectroscopy of the Brightest Bursts up to Energies of 200MeV Spectroscopy of the Brightest Bursts up to Energies of 200MeV

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..836..612g&link_type=abstract

GAMMA-RAY BURSTS IN THE SWIFT ERA: Sixteenth Maryland Astrophysics Conference. AIP Conference Proceedings, Volume 836, pp. 612-

Astronomy and Astrophysics

Astrophysics

Gamma-Ray Sources, Gamma-Ray Bursts, Spectroscopy And Spectrophotometry

Scientific paper

The EGRET calorimeter, TASC, was triggered by BATSE and thus observed several bursts in the energy range of 1-200 MeV. The analysis of combined LAD-TASC data has been developed and discussed previously. Spectroscopy of GRB941017 based on this analysis, uncovered a MeV-component that would be hidden in the brightness of the synchrotron component in a time integrated spectrum of the whole burst, while separation into shorter time intervals allowed a unique identification of a new component different from the synchrotron component. This paper performs the same analysis used for GRB941017 to study the spectral temporal evolution for 21/68 of the brightest BATSE bursts in the broadest energy range yet reported. We consider the Band function plus a power law to describe the spectra at keV and MeV energies respectively. The higher energy spectral component is a major fraction of the energy in GRB941017, but also is significant in one time interval of the spectrum of GRB980923. Other relevant results from this analysis are given.

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