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ASAS-SN Discovery of A Bright Probable Supernova in NGC 4666

ATel #6795; T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, 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), J. Brimacombe (Coral Towers Observatory), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), S. Kiyota (Variable Star Observers League in Japan), J. Nicolas (Groupe SNAUDE, France)
on 9 Dec 2014; 19:23 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 #: 6801, 6815

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 bright transient source, most likely a supernova, in the galaxy NGC 4666:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14lp  12:45:09.101    -00:27:32.49     2014-12-09.61     14.3 

ASASSN-14lp was discovered in images obtained on UT 2014-12-09.61 at V~14.4 mag, but it is not detected (V>15.3) in poor-quality images obtained on 2014-12-08.35. An image obtained on 2014-12-09.74 confirms the discovery of the transient. This figure shows the archival SDSS image of the host (left) and the LCOGT confirmation image (right). The red lines indicate the position of the transient in the LCOGT confirmation images.

The position of ASASSN-14lp is approximately 12" from the center of the galaxy NGC 4666 (z=0.0051, d=18.2 Mpc, via NED), giving an absolute V-band magnitude of approximately -17.0 (m-M=31.3, A_V=0.07). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.