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ASAS-SN Discovery of A Probable Supernova in CGCG 229-010

ATel #7296; J. Brimacombe (Coral Towers Observatory), S. Kiyota (Variable Star Observers League in Japan), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), G. Krannich (Roof Observatory Kaufering)
on 26 Mar 2015; 19:47 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 7306

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 229-010

Object       RA (J2000)     DEC (J2000)    Disc. UT Date   Disc. V mag  
ASASSN-15fs  18:58:40.816  +43:28:07.88    2015-03-25.56    16.6 
ASASSN-15fs was discovered in images obtained on UT 2015-03-25.56 at V~16.6 mag. We also detect the object in images obtained on UT 2015-03-21.58 (V~17.1). We do not detect (V>17.0) the object in images taken on UT 2015-03-19.62 and before. Follow-up images obtained by J. Brimacombe and S. Kiyota confirm the discovery of the transient. This figure shows the archival DSS image of the host (left) and the S. Kiyota confirmation image (right). The red circle has a radius of 2" and is centered on the position of the transient in the S. Kiyota image, obtained on UT 2015-03-26.51 with 0.61-m telescope at Sierra Remote Observatory, CA, USA.

The position of ASASSN-15fs is approximately 2.5" from the center of the galaxy CGCG 229-010 (z=0.02902, d=120 Mpc, via NED), giving an absolute V-band magnitude of approximately -19.05 (m-M=35.4, A_V=0.25). 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.