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ASAS-SN Discovery of a Possible Supernova in ESO 075-G049

ATel #6260; K. Z. Stanek, T. W.-S. Holoien (Ohio State), J. Brimacombe (Coral Towers Observatory), B. J. Shappee, A. B. Davis, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton/Diego Portales), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 23 Jun 2014; 23:17 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 #: 6271

During the ongoing All-Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the recently commissioned double 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy ESO 075-G049

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14db  22:02:01.85    -70:02:26.19     2014-06-22.28     16.3   

ASASSN-14db was discovered in images obtained 2014 UT June 22.28 at V~16.3 mag. We also detect the object in images obtained on June 23.37 (V~16.3) and June 20.30 (V~16.5), but we do not detect this object (V>16.9) in images taken on 2014 UT June 08.25 and before. Images obtained on UT June 23.83 with the RCOS 16" telescope near Siding Spring Observatory confirm the detection of the transient. This figure shows the ASAS-SN June 22 subtraction image (top left), ASAS-SN reference image (top right), archival DSS image (bottom left), and the RCOS confirmation image (bottom right). The red line shows the bar of the galaxy and the white circle is centered on the ASAS-SN position of the transient.

The ASAS-SN position of ASASSN-14db is approximately 3.6" from the core of ESO 075-G049 (z=0.037519, d=158 Mpc, via NED), which would give it an absolute V mag of approx. -19.8 in the latest epoch (m-M=35.99, A_V=0.082, 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.