[ Previous | Next | ADS ]

ASAS-SN Discovery of A Probable Supernova in CGCG 292-006

ATel #7058; R. A. Koff (Antelope Hills Observatory), S. Kiyota (Variable Star Observers League in Japan), J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), E. Falco (CfA), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 13 Feb 2015; 16:09 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 7064

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova, in the galaxy CGCG 292-006:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15cz  11:35:24.40   +57:38:59.58      2015-02-12.48    17.1 

ASASSN-15cz was discovered in images obtained on UT 2015-02-12.48 at V~17.1 mag. We do not detect (V>17.2) the object in images taken on UT 2015-02-08.47 and before. Images obtained by R. A. Koff on UT 2015-02-13.16 using a Meade LX-200 25-cm telescope located at Antelope Hills Observatory, by S. Kiyota on UT 2014-02-13.20 using a Planewave CDK 0.61-m telescope located at Sierra Remote Observatory, and by J. Brimacombe on UT 2015-02-13.28 with the RCOS 51-cm telescope in New Mexico confirm the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the S. Kiyota confirmation image (right). The red arrow indicates the position of the transient in the S. Kiyota image.

The position of ASASSN-15cz is approximately 0.2" South and 3.2" West from the center of the galaxy CGCG 292-006 (z=0.028767, d=123 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.4 (m-M=35.45, A_V=0.036). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.