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MASTER Supernova Candidate in Seyfert Galaxy ESO198-G024 is Most Likely Due to an AGN Activity

ATel #10627; K. Z. Stanek (OSU), B. J. Shappee (Hubble Fellow, Carnegie Observatories), C. S. Kochanek, T. W.-S. Holoien, J. V. Shields, T. A. Thompson (OSU), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 9 Aug 2017; 18:12 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Supernovae

We have investigated the presence of a bright (~14.3 mag) supernova candidate in ESO198-G024, reported by the MASTER project in ATel #10625. ESO198-G024 is at z=0.0455 (luminosity distance modulus of 36.4), so a supernova that bright would be very interesting.

As indicated in ATel #10625, ESO198-G024 contains a Type I Seyfert AGN at its core. That AGN is very active in ASAS-SN data, as can be seen via the ASAS-SN Sky Patrol light curve. The core of the galaxy has produced numerous excess flux triggers in ASAS-SN transient pipeline, most recently on UT 2017-08-05.27 and UT 2017-08-09.27. These triggers are located within about 1'' from the core of the galaxy, well within one ASAS-SN pixel. We conclude that the supernova candidate reported in ATel #10625 is most likely due to AGN activity at the center of ESO198-G024.

We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University, NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA).

ASAS-SN Sky Patrol Light Curve for ESO198-G024