ASAS-SN Discovery of a Probable Supernova in UGC 01395
ATel #5193; K. Z. Stanek, B. J. Shappee, C. S. Kochanek, J. Jencson, U. Basu, J. F. Beacom (Ohio State), J. L. Prieto (Princeton), D. Szczygiel, G. Pojmanski (Warsaw University Observatory), M. Dubberley, M. Elphick, S. Foale, E. Hawkins, D. Mullens, W. Rosing, R. Ross, Z. Walker (Las Cumbres Observatory)
on 4 Jul 2013; 17:55 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)
Subjects: Optical, Request for Observations, Supernovae
Referred to by ATel #: 5194
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or
"Assassin"; ATel #5110, #5138, #5168, #5177, #5181, #5183, #5186), using data from
the double 14-cm "Brutus" telescope in Haleakala, Hawaii, we
discovered a new transient source, likely a supernova:
Object RA (J2000) DEC (J2000) Disc. UT Date Approx. Disc. V mag
ASASSN-13bb 01:55:20.71 +06:36:35.28 2013 July 4.56 16.1
No source is detected on 6/27 or in earlier images (V>17 mag), with
detection in two images on 7/04 and very likely detection on 7/01.
See the ASAS-SN
discovery
image, top left panel shows the reference image, top right shows
the DSS image on the same angular scale, lower left is one of the
90-sec V-band images on 07/04 and lower right is the image subtraction
residual image on 07/04. Circle with the 15" radius has the same
position.
The new source is approximately 7" South and 19" West of the center of
z=0.017405 (69 Mpc) spiral galaxy UGC 01395, giving it an absolute
magnitude of approximately M_V=-18.3 (m-M=34.2, A_V=0.20, Schlafly &
Finkbeiner 2011) and a projected distance from the galaxy center of
approximately 7.0 kpc.
Finally we note that UGC 01395 is a Seyfert 2 galaxy and subject of
many previous observations, including with the HST.
For more information about the ASAS-SN project, see
this link
and also ASAS-SN Transients
page.
Happy Fourth of July!