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.
Space Science Center, Physics
AIP Conference Proceedings
Digital Object Identifier (DOI)
Spectra of a recent bright burst measured by CGRO-COMPTEL: GRB 990123 Young, C. A. and Connors, A. and Bennett, K. and Collmar, W. and Hermsen, W. and Kippen, R. M. and Kolaczyk, E. D. and Kuiper, L. and McConnell, M. and Miller, R. and Ryan, J. M. and Schönfelder, V. and Williams, O. R. and Winkler, C., AIP Conference Proceedings, 526, 170-174 (2000), DOI:http://dx.doi.org/10.1063/1.1361528
© 2000 American Institute of Physics