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Discovery of Five ASAS-SN Supernovae

ATel #11368; J. Brimacombe (Coral Towers Observatory), G. Stone (Sierra Remote Observatories), S. Kiyota (Variable Star Observers League in Japan), 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), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), M. Stritzinger, S. Holmbo (Aarhus)
on 27 Feb 2018; 23:00 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Patrick Vallely (vallely.7@osu.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 11369, 11444

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, the quadruple 14-cm "Leavitt" telescope in Fort Davis, Texas, the quadruple 14-cm "Payne-Gaposchkin" telescope in Sutherland, South Africa, and the quadruple 14-cm "Cassius" and "Paczynski" telescopes in Cerro Tololo, Chile, we discovered several new transient sources. Properties of the supernovae, as well as associated finding charts showing the archival imaging (left) and the follow-up confirmation image (right) are included in the table below:

Object                     RA (J2000)     DEC (J2000)   Redshift  Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-18ef  (AT 2018yq)  12:15:23.136   27:37:35.13    0.035949   2018-02-22.33      ~18.3           -17.7               0.71 
ASASSN-18dv  (AT 2018yj)  05:03:19.689   -10:58:18.06   Unk        2018-02-25.11      ~17.1            ---                3.30 
ASASSN-18du  (AT 2018yi)  13:38:20.190   -06:15:10.14   0.054971   2018-02-17.23      ~18.1           -18.9               7.92 
ASASSN-18dt  (AT 2018yh)  14:09:01.411   -30:33:25.98   0.023436   2018-02-24.26      ~16.6           -18.6               6.53 
ASASSN-18dr  (AT 2018yg)  12:25:58.541   04:28:26.30    0.018469   2018-02-23.23      ~17.3           -17.3               0.41 

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 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 would like to 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.