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Discovery of Three ASAS-SN Supernovae

ATel #10760; J. Brimacombe (Coral Towers Observatory), J. S. Brown, P. Vallely, K. Z. Stanek, C. S. Kochanek, J. Shields, T. A. Thompson (Ohio State), T. W.-S. Holoien, B. J. Shappee (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), P. Marples (Leyburn Observatory, Australia), G. Stone (Sierra Remote Observatories)
on 19 Sep 2017; 21:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.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 "Cassius" telescope in Cerro Tololo, Chile, we discovered three new transient sources, most likely supernovae. Properties of the new source and photometry are summarized in the tables below:

Object                     RA (J2000)     DEC (J2000)   Redshift  Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-17lx   (AT 2017gqe)  07:23:35.437   -52:38:13.10  0.0335    2017-09-04.31      ~16.8          -19.5               8.95 
ASASSN-17lz   (AT 2017grw)  15:57:29.739   +15:52:21.34  0.0174    2017-09-11.99      ~16.5          -18.0               0.51 
ASASSN-17mf   (AT 2017gsu)  21:02:21.642   -54:35:18.53  0.0434    2017-09-12.03      ~17.5          -18.8               0.67 

Follow-up observations are encouraged.

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-17xx 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-17xx (AT 2017xyz) 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, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.