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ASAS-SN Discovery of A Probable Supernova in GALEXASC J000802.78-363348.1

ATel #8202; J. Brimacombe (Coral Towers Observatory), G. Bock (Runaway Bay Observatory, Australia), T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, J. S. Brown, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, Ping Chen (KIAA-PKU), S. Kiyota (Variable Star Observers League in Japan), R. A. Koff (Antelope Hills Observatory), G. Krannich (Roof Observatory Kaufering), P. Marples (Leyburn Observatory, Australia), G. Masi (Virtual Telescope Project, Ceccano, Italy), B. Nicholls (Mt. Vernon Obs., New Zealand), W. Wiethoff (University of Minnesota, Duluth)
on 21 Oct 2015; 15:31 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 #: 8213

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in Cerro Tololo, Chile, we discovered a new transient source, most likely a supernova, in the galaxy GALEXASC J000802.78-363348.1.

ASASSN-15rq was discovered in images obtained on UT 2015-10-21.00 at V~16.0 mag. We do not detect (V>17.6) the object in images taken on UT 2015-10-13.21 and before. Images obtained by J. Brimacombe on UT 2015-10-21.44 and by G. Bock on UT 2015-10-21.50 confirm the discovery of the transient. This figure shows the archival DSS image of the host (left) and the G. Bock confirmation image (right). The red circle has a radius of 4" and is centered on the position of the transient in the G. Bock image.

The position of ASASSN-15rq is approximately 3.3" South and 4.2" East from the center of the galaxy GALEXASC J000802.78-363348.1, which has no redshift available in NED. Properties of the new source and photometry are summarized in the tables below:

Object       RA (J2000)     DEC (J2000)      Disc. UT Date   Disc. V mag  Approx. Abs. Mag   Offset from Host (") 
ASASSN-15rq  00:08:03.14    -36:33:51.81      2015-10-21.00      16.0          N/A               5.34 
Obs. UT Date         V mag 
2015-10-13.21        >17.6 
2015-10-21.00         16.0 

Follow-up observations, particularly spectroscopy, are encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Robert Martin Ayers Sciences Fund. For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.