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ASAS-SN Discovery of a Likely Supernova in IC 527

ATel #6102; K. Z. Stanek, T. W-S. Holoien, B. J. Shappee, C. S. Kochanek, J. Jencson, U. Basu, B. Davis, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), J. Brimacombe (Coral Towers Observatory), D. Bersier (LJMU)
on 26 Apr 2014; 18:10 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 6105

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, very close to the core of IC 527

Object       RA (J2000)   DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14ar  09:09:41.7  +37:36:06.5       2014-04-24.28      16.2 
ASASSN-14ar was discovered in images obtained 2014 UT Apr. 24.28 at V~16.2 mag. This object was also present at comparable brightness in images taken on 2014 UT Apr.12.29, but these data have poor image quality and our detection algorithm was not triggered. We do not detect (V<16.5) this object in images taken on 2014 UT Apr. 11.27 and before. Images obtained on UT Apr. 25.2 with the LCOGT 1-m robotic telescope at McDonald Observatory and on UT Apr. 25.1 with the RCOS 51-cm telescope in New Mexico (obtained by J. Brimacombe) confirm the discovery of the new transient. 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 LCOGT confirmation image (bottom right). The red circle has a radius of 3.0" at the position of the SN candidate derived from the LCOGT image.

The transient is approximately 1" North and 1" West of the core of barred spiral galaxy IC 527 (z=0.02298, d=99 Mpc, via NED), which would give it an absolute V mag of approx. -18.8 (m-M=35.0, A_V=0.06, 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.