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ASAS-SN Discovery of A Probable Supernova in SDSS J144455.21+243443.9

ATel #6989; J. M. Fernandez (Observatory Inmaculada del Molino), J. Brimacombe (Coral Towers Observatory), R. A. Koff (Antelope Hills Observatory), S. Kiyota (Variable Star Observers League in Japan), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, A. B. Danilet, G. Simonian, U. Basu, N. Goss, J. F. Beacom (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), B. Nicholls (Mt. Vernon Obs., New Zealand)
on 25 Jan 2015; 18:29 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 #: 7040

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 SDSS J144455.21+243443.9:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15bo  14:44:55.22    +24:34:43.70     2015-01-22.58    17.1 

ASASSN-15bo was discovered in images obtained on UT 2015-01-22.58 at V~17.1 mag. We also detect the object in images obtained on UT 2015-01-24.59 (V~16.6), and we do not detect (V>17.1) the object in images taken on UT 2015-01-22.510 and before. Images obtained by J. M Fernandez on UT 2015-01-25.14 with a 20-cm Celestron C8 telescope at Observatory Inmaculada del Molina in Osuna, Spain, by J. Brimacombe on UT 2015-01-25.33 with the RCOS 51-cm telescope in New Mexico, by R. A. Koff on UT 2015-01-25.40 using a Meade LX-200 25-cm telescope located at Antelope Hills Observatory, and by S. Kiyota on UT 2015-01-25.41 using a Planewave CDK 0.43-m telescope located near Mayhill, New Mexico 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 circle has a radius of 3.0" and is centered on the position of the transient in the S. Kiyota image.

The position of ASASSN-15bo is approximately 0.3" South and 0.1" East from the center of the galaxy SDSS J144455.21+243443.9, which has no spectroscopic redshift available in NED. Follow-up observations, particularly spectroscopy, are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported in part by Mt. Cuba Astronomical Foundation. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.