Discovery of Eight ASAS-SN Supernovae

ATel #11343; G. Stone (Sierra Remote Observatories), J. Brimacombe (Coral Towers Observatory), P. Cacella (DogsHeaven Observatory), R. G. Farfan (Uraniborg Observatory, Sevilla, Spain), 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), D. Trappett (BGGS Dorothy Hill Observatory)
on 23 Feb 2018; 18:45 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Patrick Vallely (vallely.7@osu.edu)

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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-18dn  (AT 2018yd)  06:10:58.951   -33:41:18.40   0.038480   2018-02-22.09      ~17.9           -18.3               1.08 
ASASSN-18dm  (AT 2018yc)  11:52:45.488   37:51:15.27    Unk        2018-02-22.32      ~17.7            ---                1.14 
ASASSN-18dl  (AT 2018xz)  10:02:31.441   13:43:41.48    0.033537   2018-02-21.25      ~17.6           -18.3               0.32 
ASASSN-18dk  (AT 2018xy)  09:16:22.106   10:13:54.70    0.030875   2018-02-21.16      ~17.3           -18.5               0.45 
ASASSN-18dj  (AT 2018xv)  06:00:58.907   -17:59:33.03   Unk        2018-02-19.83      ~17.6            ---                3.05 
ASASSN-18dd  (AT 2018wd)  16:53:55.891   35:15:15.14    0.037314   2018-02-17.48      ~17.3           -18.7               4.72 
ASASSN-18db  (AT 2018vx)  14:43:10.428   17:28:17.06    Unk        2018-02-17.43      ~17.1            ---                0.54 
ASASSN-18da  (AT 2018vw)  03:29:16.648   -23:58:43.11   Unk        2018-02-17.09      ~16.5            ---                3.92 

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.