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ASAS-SN Discovery of A Probable Supernova in SDSS J103529.48+343420.2

ATel #7097; R. A. Koff (Antelope Hills Observatory), 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), S. Kiyota (Variable Star Observers League in Japan), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 18 Feb 2015; 04:15 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 #: 7103

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 SDSS J103529.48+343420.2:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15df  10:35:29.72   +34:34:23.67      2015-02-15.46    17.3 

ASASSN-15df was discovered in images obtained on UT 2015-02-15.46 at V~17.3 mag. We also detect the object in images obtained on UT 2015-02-17.45 (V~16.9). We do not detect (V>17.7) the object in images taken on UT 2015-02-11.45 and before. Images obtained by R. A. Koff on UT 2015-01-25.40 using a Meade LX-200 25-cm telescope located at Antelope Hills Observatory and by J. Brimacombe on 2015-02-18.16 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 R. A. Koff confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the R. A. Koff image.

The position of ASASSN-15df is approximately 3.4" North and 3.0" East from the center of the galaxy SDSS J103529.48+343420.2 (z=0.03631, d=160.8 Mpc; please see the SDSS page here), giving an absolute V-band magnitude of approximately -18.8 (m-M=36.03, A_V=0.05). 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.