Discovery of 9 ASAS-SN Supernova Candidates
ATel #14829; J. Brimacombe (Coral Towers Observatory), P. Vallely, K. Z. Stanek, C. S. Kochanek, C. Christy, M. Smith, S. Bose, 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 (KIAA-PKU), M. Stritzinger (Aarhus), G. Bock (Runaway Bay Observatory, Australia), P. Pearl (The Gap Observatory, BOSS)
on 6 Aug 2021; 00:15 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Patrick Vallely (vallely.7@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, 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. g mag Approx. Abs. Mag Offset from Host (")
ASASSN-21ou (AT 2021vau) 05:04:17.660 +04:39:04.31 0.036365 2021-08-04.62 ~16.8 -19.3 1.48
ASASSN-21os (AT 2021vac) 01:47:49.080 -61:20:53.15 0.042100 2021-08-04.24 ~17.5 -18.8 4.39
ASASSN-21or (AT 2021uxb) 19:55:10.756 -61:55:47.56 0.014767 2021-08-04.05 ~17.9 -16.2 20.54
ASASSN-21on (AT 2021upa) 16:43:00.185 -68:56:55.34 0.014510 2021-08-01.09 ~17.6 -16.7 0.41
ASASSN-21oi (AT 2021uov) 23:26:55.903 -45:45:58.02 Unk 2021-07-31.16 ~18.1 --- 1.41
ASASSN-21oe (AT 2021ulz) 23:15:06.934 -53:39:21.70 0.046962 2021-07-30.30 ~17.3 -19.2 3.79
ASASSN-21nw (AT 2021ugs) 16:26:33.920 -63:12:18.70 0.012792 2021-07-25.99 ~16.3 -17.9 34.58
ASASSN-21nt (AT 2021uet) 10:55:57.467 -33:05:46.49 0.010791 2021-07-27.98 ~16.9 -16.9 6.02
ASASSN-21nq (AT 2021uds) 00:10:43.936 -63:06:03.56 0.012900 2021-07-27.18 ~16.3 -17.3 6.45
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-21xx 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-21xx (AT 2021xyz) 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 grants GBMF5490 and GBMF10501, NSF grant AST-1908570, 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.
