ASASSN-16ab: Discovery of A Bright, Nearby Supernova Candidate in Dwarf Galaxy PGC 037392
ATel #8502; B. J. Shappee (Hubble Fellow, Carnegie Observatories), K. Z. Stanek, J. S. Brown, T. W.-S. Holoien, C. S. Kochanek, D. Godoy-Rivera, U. Basu (Ohio State), Subo Dong ((KIAA-PKU), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Ping Chen (KIAA-PKU), J. Brimacombe (Coral Towers Observatory)
on 3 Jan 2016; 20:07 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Benjamin Shappee (email@example.com)
Subjects: Optical, Supernovae, Transient
Referred to by ATel #: 8505
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, we
discovered a new transient source, most likely a supernova, in the galaxy PGC 037392.
ASASSN-16ab was discovered in images obtained on UT 2016-01-03.62 at V~14.7 mag. We also detect the object in images obtained on UT
2015-12-27.5 (V~16.3). We do not detect (V>16.7) the object in images taken on UT 2015-12-24.53 and before. This figure shows the archival DSS image of the host (left), the
ASAS-SN reference image (center), and the ASAS-SN discovery difference image (right). The red circle has a radius of 5" and is centered on the
position of the transient.
The position of ASASSN-16ab is approximately
4.6" South and 9.8" West from the center of the galaxy PGC 037392 (z=0.004293, d=22.7 Mpc, via
NED), giving an absolute V-band magnitude of approximately -17.1 (m-M=31.78, A_V=0.058) at discovery. 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-16ab 11:55:04.245 +01:43:06.77 2016-01-03.62 14.7 -17.1 10.8"
Observation Date V mag
2015-12-24.53 >16.70 99.9
2015-12-27.51 16.42 0.23
2015-12-27.55 16.17 0.14
2016-01-03.62 14.69 0.03
Follow-up observations are encouraged.
We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Center for Cosmology
and AstroParticle Physics (CCAPP) at OSU, the Mt. Cuba Astronomical Foundation, George Skestos, and the Robert Martin Ayers Sciences Fund. For
more information about the ASAS-SN project, see the ASAS-SN Homepage and the
list of all ASAS-SN transients.