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SAS-SN Discovery of a Likely Supernova in SDSS J155702.70+372500.0

ATel #6150; A. B. Davis, B. J. Shappee (Ohio State), J. Brimacombe (Coral Towers Observatory), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), D. Bersier (LJMU)
on 20 May 2014; 14:44 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Benjamin Shappee (shappee@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 6161

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, probably a supernova, in the outskirts of SDSS J155702.70+372500.0

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14ay  15:57:03.15   +37:24:57.78      2014-05-19.55      16.2 

ASASSN-14ay was discovered in images obtained 2014 UT May 19.55 at V~16.2 mag. We also detect the object in images obtained on May 11.42 and May 18.55. We do not detect (V<17.0) this object in images taken on 2014 UT May 8.27 and before. An image obtained on UT May 20.26 with the RCOS 51-cm telescope in New Mexico (obtained by J. Brimacombe) confirms the discovery of the new transient. The coordinates we report were measured off of the confirmation image. This figure shows the ASAS-SN reference image (top left), archival SDSS g-band image (top right), ASAS-SN discovery subtraction image (bottom left), and the confirmation image (bottom right). The green circle has a radius of 3.0" at the position of the SN candidate derived from the supernova candidate.

The transient is approximately 2.3" South and 5.4" East of the core of SDSS J155702.70+372500.0 (z=0.030869, d=131 Mpc, via NED), which would give it an absolute V mag of approx. -19.4 (m-M=35.58, A_V=0.061, 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.