Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422l..59k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 422, no. 2, p. L59-L62
Astronomy and Astrophysics
Astrophysics
35
Energy Spectra, Gamma Ray Bursts, Spectrum Analysis, Time Series Analysis, Gamma Ray Observatory, Photons, Temporal Resolution
Scientific paper
Burst and Transient Source Experiment (BATSE) observed its most intense gamma-ray burst on 1993 January 31. The event reached count rates is approximately greater than 2 x 106 counts/s with most of the flux emitted in an extremely short (is approximately less than 0.1 s) interval followed by a long tail, lasting about 50 s. Most of this initial pulse was recorded by our instrument with unique, very high temporal resolution (1 ms). We were thus able to show large changes in spectral hardness on 2 ms timescales throughout this initial complex. Photons as low as 25 keV and extending up to greater than 4 MeV in energy were recorded by BATSE during this first interval. The burst spectrum is best fitted by a broken power law with a break energy of 170 +/- 27 keV. The low-energy spectral index is -1.30 +/- 0.05, while a softer spectral index of -1.9 fits the spectrum between 170 keV and 2 MeV. Our data provide the only low-energy spectrum for this event; the combination of our spectrum with the one reported for GRB 930131 by the Energetic Gamma Ray Experiment Telescope (EGRET) group extends the total energy spectrum of a GRB for the first time over five decades, up to the GeV range.
Band David
Bhat Narayana
Briggs Michael Stephen
Fishman Gerald J.
Horack John M.
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