ASAS-SN Discovery of a Likely Supernova in NGC 7068

ATel #5177; C. S. Kochanek (Ohio State), J. Brimacombe (Coral Towers Observatory), B. J. Shappee, K. Z. Stanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullens, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory)
on 28 Jun 2013; 22:39 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

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During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"; ATel #4987, #4999, #5010, #5082, #5102, #5110, #5138, #5168), using data from the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we discovered a new transient source, most likely a supernova:

 
Object       RA (J2000)   DEC (J2000)      Disc. UT Date   Approx. Disc. V mag 
 
ASASSN-13av  21:26:31.934 +12:10:49.41     2013 June 26.47    16.0 

No source is detected on 6/22 or in earlier images (V>17 mag), with detection in two images on each of 6/26 and 6/28. See the ASAS-SN discovery images at this location, top left panel shows the reference image, the other three images show image subtraction residuals.

The source is approximately 6" South and 14" West of the z=0.01729 Sc galaxy NGC7068, giving it an absolute magnitude of approximately -18.4 (m-M=34.3, A_V=0.3, Schlafly & Finkbeiner 2011) and an offset from the galaxy of approximately 5 kpc for a distance of 73 Mpc.

Confirmation IR filter (close to I-band) image (3 x 15 min exposures) obtained by J. Brimacombe with a 17 inch CDK telescope at Coral Towers Observatory (Cairns, Australia) shows a new source at the location consistent with ASAS-SN position, see the confirmation image.

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