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The COMPTEL instrumental line background
G. Weidenspointner, M. Varendorff, U. Oberlack +8
The instrumental line background of the Compton telescope COMPTEL onboard the Compton Gamma-Ray Observatory is due to the activation and/or decay of many isotopes. The major compon…
A bright X-ray transient towards NGC 5128 (Centaurus A)
H. Steinle, K. Dennerl, J. Englhauser
During five ROSAT HRI observations in July 1995, a bright X-ray source (designated 1RXH J132519.8-430312) was detected 2.5' south-west of the nucleus of NGC 5128 (Centaurus A) at t…
The first COMPTEL Source Catalogue
V. Schoenfelder, the COMPTEL Collaboration
The imaging Compton telescope COMPTEL aboard NASA's Compton Gamma-Ray Observatory has opened the MeV gamma-ray band as a new window to astronomy. COMPTEL provided the first complet…
The Spectral Variability of Cygnus X-1 at MeV Energies
M. L. McConnell, K. Bennett, H. Bloemen +8
In previous work, we have used data from the first three years of the CGRO mission to assemble a broad-band -ray spectrum of the galactic black hole candidate Cygnus X-1. Contem…
A large high-energy gamma-ray flare from the blazar 3C 273
W. Collmar, O. Reimer, K. Bennett +8
The Compton Gamma-Ray Observatory (CGRO) experiments EGRET and COMPTEL observed the Virgo sky region continuously for 7 weeks between December 10, 1996 and January 28, 1997. The pr…
A High Sensitivity Measurement of the MeV Gamma-Ray Spectrum of Cygnus X-1
M. L. McConnell, J. M. Ryan, W. Collmar +9
The Compton Gamma-Ray Observatory (CGRO) has observed the Cygnus region on several occasions since its launch in 1991. The data collected by the COMPTEL experiment on CGRO represen…