activity
19952024
most citedThe Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617

1.9k citations · 10.6k across the 159 of their papers we have counts for

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Showing 2001Show all

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astro-ph2001

A cookbook for the XMMSAS

D. Grupe

This paper will give a short description of a `cookbook' for the XMM-Newton data reduction software XMMSAS. This `cookbook' has been developed at the Max-Planck-Institut für extrat…

astro-ph2001

X-ray transient AGN and galaxies

D. Grupe

X-ray transience is the most extreme form of variability observed in AGN or normal in-active galaxies. While factors of 2-3 on timescales of days to years are quite commen among AG…

astro-ph2001★ 15 cited

RX J2217.9--5941: A highly X-ray variable Narrow-Line Seyfert1 galaxy

D. Grupe, H. -C. Thomas, K. M. Leighly

We report the discovery of a highly X-ray variable AGN, RX J2217.9-5941. This object was bright during the ROSAT All-Sky Survey (RASS), during which a decrease in the count rate by…