[ Previous | Next | ADS ]

ASAS-SN Discovery of A Likely Supernova in CGCG 103-030

ATel #6169; J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, B. J. Shappee, K. Z. Stanek, C. S. Kochanek, A. B. Davis, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), D. Bersier (LJMU)
on 26 May 2014; 00:40 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 #: 6249

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 likely supernova in CGCG 103-030:

Object          RA (J2000)     DEC (J2000)        Disc. UT Date    Disc. V mag 
ASASSN-14bf    13:58:12.75    +17:31:53.66        2014-05-21.37       17.0 

ASASSN-14bf was discovered in images obtained 2014 UT May 21.37 at V~17.0 mag. We also detect the transient in images obtained on 2014 UT May 17.46 (V~16.7 mag), May 23.34 (V~17.0 mag) and May 23.37 (V~17.1 mag), and do not detect (V>17.0) this object in images taken on 2014 UT May 10.38 and before. An image obtained on UT May 25.35 with the RCOS 51-cm telescope in New Mexico (obtained by Joe Brimacombe) confirms the discovery of the transient. This figure shows the ASAS-SN reference image (top left), ASAS-SN discovery subtraction image (top right), archival SDSS image (bottom left), and RCOS confirmation image (bottom right). The red circle has a radius of 3.5" at the position of the SN candidate derived from the RCOS image.

The transient's position in the RCOS follow-up image is 1.7" N and 5.0" E from the center of CGCG 103-030 (z=0.022447, d=97 Mpc, via NED), giving an absolute V-band magnitude of approx. -18.0 (m-M=34.94, A_V=0.081, Schlafly & Finkbeiner 2011). Follow-up observations are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.