Spectra of a recent bright burst measured by CGRO-COMPTEL: GRB 990123
Abstract
CGRO-COMPTEL measures gamma-ray burst positions, time-histories and spectra in the 0.1-30 MeV energy range, in both imaging ``telescope'' and single detector ``burst spectroscopy'' mode. GRB 990123, one of the most recent bright bursts seen by COMPTEL, was caught in the optical while the gamma-ray emission was ongoing. The burst spectral shape can be characterized by a peak in ν-Fν just below 1 MeV and a power-law tail above (photon index~-2.4,) and flattening below. There is also spectral evolution by downward movement of the peak and/or softening of the power laws. We present light-curves, time resolved spectra and an image map for this burst. .
- Publication:
-
Gamma-ray Bursts, 5th Huntsville Symposium
- Pub Date:
- September 2000
- DOI:
- 10.1063/1.1361528
- Bibcode:
- 2000AIPC..526..170Y
- Keywords:
-
- 98.70.Rz;
- 98.70.Sa;
- 98.62.Py;
- 95.75.Rs;
- gamma-ray sources;
- gamma-ray bursts;
- Cosmic rays;
- Distances redshifts radial velocities;
- spatial distribution of galaxies;
- Remote observing techniques