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ASAS-SN Discovery of A Probable Supernova in Dwarf Host GALEXASC J045749.46-213526.3

ATel #6894; T. W.-S. Holoien, Subo Dong (KIAA-PKU), K. Z. Stanek, C. S. Kochanek, A. B. Davis, 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), P. R. Wozniak (LANL), J. Brimacombe (Coral Towers Observatory), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 10 Jan 2015; 22:15 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 GALEXASC J045749.46-213526.3:

 
Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag 
ASASSN-15al  04:57:49.63   -21:35:34.11      2015-01-10.33    16.9 

ASASSN-15al was discovered in images obtained on UT 2015-01-10.33 at V~16.9 mag. We do not detect (V>16.9) the object in images taken on UT 2015-01-08.23 and before. An image obtained on UT 2015-01-10.79 with the LCOGT 1-m robotic telescope in Sutherland, South Africa confirms the discovery of the transient. This figure shows the archival DSS image of the host (left) and the LCOGT g-band confirmation image (right). The red circle has a radius of 3.0" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-15al is approximately 7.1" South and 1.2" East from the center of the galaxy GALEXASC J045749.46-213526.3, an apparent dwarf galaxy with no 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.