337 citations · 2.8k across the 61 of their papers we have counts for
Showing 1995 · astro-phShow all
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astro-ph1995
Ultrasoft transient X-ray emission from AGN
K. Mannheim, D. Grupe, K. Beuermann +2
We report some remarkable and unexpected results of optical/UV/X-ray follow-up observations of bright soft X-ray selected AGN from the ROSAT All-Sky-Survey. The majority of these A…
astro-ph1995
X-RAY OUTBURST OF THE PECULIAR SEYFERT GALAXY IC 3599
D. Grupe, K. Beuermann, K. Mannheim +4
We report optical, soft X-ray, and UV observations of the peculiar Seyfert galaxy IC 3599 using data obtained with ROSAT and IUE. Most remarkably, we discovered a rapid decrease of…