ASAS-SN Discovery of A Probable Supernova in UGC 01332
ATel #7863; 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), Subo Dong (KIAA-PKU), J. Brimacombe (Coral Towers Observatory), E. Falco (CfA), P. R. Wozniak (LANL), D. Szczygiel, G. Pojmanski (Warsaw University Observatory)
on 1 Aug 2015; 18:37 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Supernovae
Referred to by ATel #: 7871
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 an elliptical galaxy UGC 01332.
ASASSN-15nn was discovered in images obtained on UT 2015-07-24.59 at
V~16.7. It was also detected on images obtained on UT 2015-07-28.51
(V~16.2), UT 2015-07-30.61 (V~16.6) and UT 2015-08-01.6 (V~16.4). It
was not detected in images obtained on 2015-07-19.56 (V>17.4). Images
obtained on UT 2015-08-01 with the 1-m LCOGT robotic telescope at
McDonald Observatory confirm the discovery of the transient. This
figure shows the archival DSS image of the host (left) and the
confirmation images (center and right). The red circle has a radius of
1.5" and is centered on the position of the transient in the LCOGT
images.
The position of ASASSN-15nn is approximately 1.5" from the center of
the galaxy UGC 01332 (z=0.022619, d=91 Mpc, via NED), giving an
absolute V-band magnitude of approximately -18.7 at discovery
(m-M=34.8, A_V=0.56). 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-15nn 01:52:18.17 +48:05:17.3 2015-07-24.5 16.7 -18.7 1.5
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.