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ASAS-SN Discovery of A Probable Supernova in CGCG 218-007

ATel #7035; 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)
on 8 Feb 2015; 20:47 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 #: 7038

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 218-007:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15cq  13:23:48.46    +43:17:59.11      2015-02-08.57    16.0 

ASASSN-15cq was discovered in images obtained on UT 2015-02-08.57 at V~16.0 mag. We also detect the object in images obtained on UT 2015-02-02.53 (V~16.7). We do not detect (V>16.4) the object in images taken on UT 2015-02-01.55 and before. An image obtained by J. Brimacombe on UT 2015-02-08.71 with the RCOS 41-cm telescope near Siding Spring Observatory confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the J. Brimacombe confirmation image (right). The red arrow indicates the position of the transient in the J. Brimacombe image.

The position of ASASSN-15cq is approximately 5.2" South and 0.1" East from the center of the galaxy CGCG 218-007 (z=0.027276, d=117 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.4 (m-M=35.34, A_V=0.035). 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.