ASASSN-18nt: Discovery of A Probable Intracluster Supernova in ABELL 0194
ATel #11762; Ping Chen, Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), P. Vallely, K. Z. Stanek, C. S. Kochanek, J. S. Brown, J. Shields, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), S. Bose (KIAA-PKU), M. Stritzinger, S. Holmbo (Aarhus), G. Bock (Runaway Bay Observatory, Australia)
on 22 Jun 2018; 17:14 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Supernovae, Transient
During the ongoing All Sky Automated Survey for SuperNovae
(ASAS-SN, Shappee et
al. 2014), using data from the quadruple 14-cm "Brutus" telescope
in Haleakala, Hawaii, we discovered a new transient source, most
likely a supernova, in the galaxy ABELL 0194.
ASASSN-18nt (AT 2018ctv) was discovered in images obtained on UT
2018-06-21.19 at V~17.2 mag. We do not detect (V>17.8) the object in
images taken on UT 2018-06-17.59 and before. An image obtained on
2018-06-22 using one of Las Cumbres Observatory 0.4-m robotic
telescopes confirms the discovery of the transient. This figure
shows the archival SDSS g-band image of the host (left) and the LCO
confirmation image (right). The red circle has a radius of 5" and is
centered on the position of the transient in the LCO image.
The position of ASASSN-18nt is approximately 144" North and
168" East from the center of the galaxy ABELL 0194 (z=0.018000,
d=70.7 Mpc, via NED), giving an absolute V-band magnitude of
approximately -17.2 (m-M=34.25, A_V=0.153). Properties of the new
source and photometry are summarized in the tables below:
Object RA (J2000) DEC (J2000) Disc. UT Date Disc. V mag Approx. Abs. Mag Offset from Host (")
ASASSN-18nt 01:25:52.03 -01:22:01.65 2018-06-21.19 17.2 -17.2 221.91
Obs. UT Date V mag
2018-06-17.59 >17.8
2018-06-21.19 17.2
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential
confusion, ASAS-SN will continue using ASASSN-18xx transient names as
our primary nomenclature (including supernovae, but also other classes
of transients), and we strongly encourage others to do the same. We
prefer merging the names as ASASSN-18xx (AT 2018xyz) to preserve,
rather than anonymize, the origin of the transient.
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, the
Chinese Academy of Sciences South America Center for Astronomy
(CASSACA), and the Villum Fonden (Denmark). For more information about
the ASAS-SN project, see the ASAS-SN
Homepage and the list of all ASAS-SN
transients.