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ASAS-SN Discovery of a Likely Supernova in NGC 2765

ATel #5415; J. Brimacombe (Coral Towers Observatory), J. L. Prieto (Princeton), K. Z. Stanek, B. J. Shappee, C. S. Kochanek, T. W-S. Holoien, J. Jencson, U. Basu, J. F. Beacom (Ohio State), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullins, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory)
on 24 Sep 2013; 22:28 UT
Credential Certification: Jose L. Prieto (jose@obs.carnegiescience.edu)

Subjects: Optical, Supernovae, Transient

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

Object            RA(J2000)        Dec(J2000)      Disc. UT Date    Disc. V Mag  
ASASSN-13dd       09:07:36.75     +03:23:39.7     2013 Sep. 24.63      15.21  
ASASSN-13dd was discovered in images obtained on UT Sep. 24.63, undetected in our previous images of the field obtained on 2013 May 2. Confirmation images (6x300 sec) were obtained on UT Sep. 24.78 by J. Brimacombe from the Coral Towers Observatory (Cairns, Australia) using a 16" RCOS telescope with an IR filter (close to I-band). This figure shows the ASAS-SN reference image (top left), ASAS-SN discovery subtraction image (top right), CTO confirmation image (bottom left), and archival SDSS r-band image (bottom right). The red circle has a radius of 7.5" at the position of the SN candidate in each image.

The transient is approximately 5.2" North and 1.6" East of the S0 galaxy NGC 2765 (z=0.01255, d=51 Mpc from Virgo-infall corrected velocity, via NED) giving it an absolute V mag of approx. -18.4 (m-M=33.55, A_V=0.09, Schlafly & Finkbeiner 2011) and a projected distance from the host galaxy of approximately 1.4 kpc.

For more information about the ASAS-SN project see the ASAS-SN Homepage and also ASAS-SN Transients page.