ASAS-SN Discovery of A Probable Bright Supernova in UGC 04883
ATel #7593; T. W.-S. Holoien, K. Z. Stanek, 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), Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 5 Jun 2015; 16:18 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Thomas Holoien (firstname.lastname@example.org)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 7609
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 bright supernova, in the galaxy UGC 04883.
ASASSN-15kk was discovered in images obtained on UT 2015-06-05.28 at V~14.7 mag. We also detect the object in images obtained on UT 2015-06-04.31 (V~14.9), UT 2015-06-02.33 (V~14.6), and UT 2015-05-30.26 (V~16.2). We do not detect (V>16.6) the object in images taken on UT 2015-05-29.29 and before. This figure shows the archival DSS image of the host (top-left), the ASAS-SN V-band reference image (top-right), the ASAS-SN V-band 2015-06-05 discovery image (bottom-left), and the ASAS-SN V-band discovery subtraction image (bottom-right). The red circle has a radius of 10" and is centered on the position of the transient in the ASAS-SN subtraction image.
The position of ASASSN-15kk is approximately 1.6" South and 4.4" West from the center of the galaxy UGC 04883 (z=0.009893, d=41.6 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.5 (m-M=33.09, A_V=0.089). 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-15kk 09:18:31.05 +74:19:07.0 2015-06-05.28 14.7 -18.5 4.68
Obs. UT Date V mag
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.