A Comparison of Precursor and Main Emission Gamma Ray Burst Spectra

Details A Comparison of Precursor and Main Emission Gamma Ray Burst Spectra A Comparison of Precursor and Main Emission Gamma Ray Burst Spectra

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe..17m&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

Gamma-ray bursts sometimes exhibit multiple, distinct episodes of emission separated in time. A small fraction of gamma-ray bursts exhibit precursor emission, defined as emission occurring before the main peak at a lower or equal intensity. We present preliminary results of a comparison of the energy spectra of burst precursor emission with that of the main burst emission. Recent discoveries of optical and x-ray counterparts to gamma-ray bursts suggest that bursts emit the bulk of their emission initially in gamma rays, then exhibit decaying emission in the x-ray and optical regimes. The spectral shape in the gamma-ray energy band evolves significantly over time. We have investigated the consistency of this spectral evolution of precursor and main episode emission with the observed spectral decay in other energy bands.

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