ASAS-SN Discovery of A Probable Supernova in SDSS J152241.16+505836.0
ATel #7527; J. Brimacombe (Coral Towers Observatory), K. Z. Stanek, T. W.-S. Holoien, C. S. Kochanek, J. S. Brown, A. B. Danilet, G. Simonian, U. Basu, N. Goss, 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), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 18 May 2015; 17:32 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 7535
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 J152241.16+505836.0
ASASSN-15jl was discovered in images obtained on UT 2015-05-13.39 at
V=17.2, and it was also detected on UT 2015-05-18.34 at V=16.8. It was
not detected in images obtained on UT 2015-05-11.55 (V>16.8). An image
obtained by J. Brimacombe on UT 2015-05-13T16:35 using a 33-cm
telescope at Savannah Skies Observatory, Australia, confirms the
discovery of the transient. This
figure shows the archival DSS image of the host (left) and the
confirmation image (right). The red circle has a radius of 3" and is
centered on the position of the transient in the J. Brimacombe
image.
The position of ASASSN-15jl is approximately 1.0" from the center of
the galaxy SDSS J152241.16+505836.0 (z=0.034746, d=148 Mpc, via NED), giving an
absolute V-band magnitude of approximately -18.7 at discovery
(m-M=35.85, A_V=0.05). Properties of the new source are summarized in
the table below:
Object RA (J2000) DEC (J2000) Disc. UT Date Disc. V mag Approx. Abs. Mag Offset from Host (")
ASASSN-15jl 15:22:41.119 +50:58:35.43 2015-05-13.39 17.2 -18.7 1.0
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.