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)
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
