ASAS-SN Discovery of A Probable Supernova in 2MASX J22532475+0447583
ATel #6694; B. Nicholls (Mt. Vernon Obs., New Zealand), S. Kiyota (Variable Star Observers League in Japan), J. Brimacombe (Coral Towers Observatory), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Davis, G. Simonian, U. Basu, N. Goss, C. Scherer, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), L. A.G. Monard (Klein Karoo Observatory)
on 13 Nov 2014; 19:45 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 6699
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 J22532475+0447583:
Object RA (J2000) DEC (J2000) Disc. UT Date Disc. V mag
ASASSN-14kd 22:53:24.95 +04:47:57.3 2014-11-12.28 16.8
ASASSN-14kd was discovered in images obtained on UT 2014-11-12.28 at V~16.8 mag. We also detect the object in images obtained on UT 2014-11-11.24 (V~17.3). We do not detect (V>16.9) the object in images taken on UT 2014-11-09.210 and before. Images obtained by B. Nicholls on UT 2014-11-13.38 the 30cm telescope at Mt. Vernon Observatory, by S. Kiyota on UT 2014-11-13.40 using a 0.5m CDK + FLI PL-9000 at the ITelescope.NET site at Siding Springs Observatory, and by J. Brimacombe on UT 2014-11-13.41 with the CDK 43-cm telescope at Savannah Skies Observatory confirm the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the S. Kiyota confirmation image (right). The red lines indicate the position of the transient in the S. Kiyota image.
The position of ASASSN-14kd is approximately 0.8" South and 3.0" East from the center of the galaxy 2MASX J22532475+0447583, which, while clearly a galaxy in SDSS images has no spectroscopic redshift in NED. (See the SDSS page here.) The object has a PhotoZ of z=0.050988 +/- 0.029711, which would give the transient an absolute V magnitude of approximately -20.2 (m-M=36.79, A_V=0.186, Schlafly & Finkbeiner 2011) if we assume this redshift to be correct. Follow-up observations, particularly 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.