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From: atel@astronomerstelegram.org
Subject: ATel  17507
Message-Id: <20251128070557.0E646288080C@server.astronomerstelegram.org>
Date: Fri, 28 Nov 2025 02:05:57 -0500 (EST)

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Posted: Within the last 24 hours
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ATEL #17507							     ATEL #17507

Title:	Follow-up optical spectroscopy of the changing-look AGN IC
		3599 in an X-ray, UV, and optical high-state
Author:	S. Komossa (MPIfR), D. Grupe (NKU), W. Zheng (UCB), T. G.
		Brink (UCB), A. V. Filippenko (UCB), E. Elien (UCLA), C. Tapper (UCLA),
		P. Lynam (Lick), J. Wang (NAOC), N. Schartel (ESA), S. Wolsing (U
		Goettingen), V. Oknyansky (SAI)
Queries:	stefanie.komossa@gmx.de
Posted:	28 Nov 2025; 02:00 UT
Subjects:Optical, Ultra-Violet, X-ray, AGN

We report on follow-up optical spectroscopy of the Seyfert 1.9 galaxy IC
3599 (z=0.021) that was recently found in an X-ray-UV-optical high-state
with the Neil Gehrels Swift observatory based on a dedicated monitoring
program (ATel #17479, Grupe et al. 2025). Enhanced optical emission was
confirmed by Veres 2025 (ATel #17483).

Optical spectroscopy was carried out on 2025 November 22.54 UT using the
Kast double spectrograph at the Cassegrain focus of the Shane 3 m telescope
at Lick observatory. The spectra show a significant increase in the broad
Balmer lines as well as in high-ionization forbidden line transitions,
including [FeXIV]5303 and [FeX]6374. IC 3599 has changed from a Seyfert
1.9 AGN in low-state (Komossa & Bade 1999) to a Seyfert 1 AGN in high-state.

Further optical spectroscopy is planned.

Our dedicated ongoing Swift observations show that the high-state continues
in all UVOT bands and in the X-ray regime. The last observation was carried
out on November 26.

IC 3599 is an optical changing-look AGN highly variable in the X-ray regime
that is well explained by an accretion-disk instability scenario (e.g.,
Grupe et al. 2015, 2024, Komossa & Grupe 2024). We would like to thank
the Swift team for approving and carrying out the observations we proposed,
and the Lick observatory staff for performing the ToO observations.

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