The gamma-ray burst GB 920622
Abstract
We have analyzed the Ulysses, BATSE, and COMPTEL spectral data from the -ray burst of June 22, 1992 (GB 920622). COMPTEL data reveal a hard to soft evolution within the first pulse of the burst, while the mean hardness ratios of the three pulses are the same. Unlike the single instrument spectra, the composite spectrum of GB 920622 averaged over the total burst duration ranging from 20 keV up to 10 MeV cannot be fit by a single power law. Instead, the spectrum shows continuous curvature across the full energy range. COMPTEL imaging and BATSE/Ulysses triangulation constrain the source location of GB 920622 to a ring sector 1.1 arcmin wide and 2 degrees long. This area has been searched for quiescent X-ray sources using \ros survey data collected about two years before the burst. After the optical identification of the X-ray sources in and near the GRB location we conclude that no quiescent X-ray counterpart candidate for GB 920622 has been found.
Keywords
Cite
@article{arxiv.astro-ph/9505146,
title = {The gamma-ray burst GB 920622},
author = {J. Greiner and M. Sommer and N. Bade and G. J. Fishman and L. O. Hanlon and K. Hurley and R. M. Kippen and C. Kouveliotou and R. Preece and J. Ryan and V. Schönfelder and O. R. Williams and C. Winkler and M. Boer and M. Niel},
journal= {arXiv preprint arXiv:astro-ph/9505146},
year = {2016}
}
Comments
12 pages uuencoded compressed postscript with figures Accepted for publ. in A&A