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ASAS-SN Discovery of A Probable Supernova in 2MASX J18242915+5226380

ATel #6539; J. Nicolas (Groupe SNAUDE, France), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), I. Cruz (Cruz Observatory), J. Hissong (Columbus Astronomical Society), S. Kiyota (Variable Star Observers League in Japan), L. A.G. Monard (Klein Karoo Observatory), B. Nicholls (Mt. Vernon Obs., New Zealand), W. Wiethoff (University of Minnesota, Duluth)
on 4 Oct 2014; 20:56 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

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, most likely a supernova, in the galaxy 2MASX J18242915+5226380:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-14in  18:24:29.61    +52:26:32.83      2014-10-04.29    16.4 

ASASSN-14in was discovered in images obtained on UT 2014-10-04.29 at V~16.4 mag. We marginally detect the transient on UT 2014-10-01.24, UT 2014-10-02.21, and UT 2014-10-03.24, and we do not detect (V>17.0) the object in images taken on UT 2014-09-30.24 and before. Images obtained by J. Nicolas on 2014-10-04.79 with the 0.41-m telescope at Observatoire Chante-Perdrix-Dauban, France, and by E. Conseil on 2014-10-04.84 using the 0.35-m Slooh Space robotic telescope T2 at Mt. Teide, Canary Islands, confirm the discovery of the transient. This figure shows the archival DSS image (left) and the J. Nicolas confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the J. Nicolas image.

The position of ASASSN-14in is approximately 5.1" South and 3.8" East from the center of the galaxy 2MASX J18242915+5226380, which, while clearly a galaxy in DSS images, has no redshift available in NED. Follow-up observations, especially spectroscopy, 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.