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ASAS-SN Discovery of A Probable Bright Supernova in GALEXASC J225332.83+194232.9

ATel #7673; Subo Dong (KIAA-PKU), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. S. Brown, A. B. Danilet, G. Simonian, U. Basu, J. F. Beacom, T. A. Thompson (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), J. Brimacombe (Coral Towers Observatory), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 20 Jun 2015; 05:07 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Subo Dong (dongsubo@pku.edu.cn)

Subjects: Supernovae, Transient

Referred to by ATel #: 7675

ASASSN-15lo was discovered in images obtained on UT 2015-06-19.52 at V~16.7 mag. We also detect the object in images obtained on UT 2015-06-16.58 (V~16.8) and UT 2015-06-15.52 (V~17.1). We do not detect (V>16.7) the object in images taken on UT 2015-06-05.56 and before. This figure shows the archival SDSS g-band image of the host (left), and the LCOGT confirmation image in V-band taken on UT 2015-06-20.17 (right). The red circle has a radius of 5" and is centered on the position of the transient in the LCOGT image.

The position of ASASSN-15lo is approximately 15" from the center of the galaxy GALEXASC J225332.83+194232.9 (unknown redshift available via 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               
ASASSN-15lo  22:53:33.89    +19:42:30.39      2015-06-19.52      16.7 

Follow-up observations 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.