Discovery of 9 ASAS-SN Supernova Candidates, Including 3 in the TESS Field of View
ATel #14579; J. Brimacombe (Coral Towers Observatory), G. Masi (Virtual Telescope Project, Ceccano, Italy), B. Nicholls (Mt. Vernon Obs., New Zealand), P. Vallely, K. Z. Stanek, C. S. Kochanek, Z. Way, D. Desai, 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, Ping Chen (KIAA-PKU), M. Stritzinger, S. Holmbo (Aarhus), P. Marples (Leyburn Observatory, Australia)
on 26 Apr 2021; 18:42 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-21fy (AT 2021jtr) 22:20:26.516 -62:38:35.21 Unk 2021-04-13.39 ~17.8 --- 6.17
ASASSN-21fw (AT 2021jth) 04:52:18.904 -03:06:25.99 0.014657 2021-04-14.98 ~16.3 -17.8 14.17
ASASSN-21fg* (AT 2021jah) 04:00:05.770 -63:05:42.71 Unk 2021-04-10.91 ~17.6 --- ---
ASASSN-21ff* (AT 2021jaa) 11:57:06.535 -44:01:31.66 Unk 2021-04-10.25 ~17.2 --- ---
ASASSN-21fe (AT 2021izl) 07:10:06.371 -38:42:22.84 Unk 2021-04-09.99 ~17.3 --- 0.54
ASASSN-21ex* (AT 2021iff) 08:40:57.959 -67:01:44.32 Unk 2021-04-04.84 ~17.3 --- 3.21
ASASSN-21en (AT 2021hku) 20:32:02.105 -53:44:58.50 0.010908 2021-03-31.36 ~16.7 -16.6 26.14
ASASSN-21ek (AT 2021hfu) 08:13:18.336 +34:55:56.75 0.017542 2021-03-29.17 ~16.0 -18.6 0.36
ASASSN-21dt (AT 2021gbk) 05:37:01.095 -22:16:01.31 0.039961 2021-03-18.02 ~17.3 -18.9 0.41
* in TESS
Follow-up observations are encouraged, particularly of the 3 TESS transients.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-20xx 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-20xx (AT 2020xyz) 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 grants AST-1515927 and 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.
