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ASASSN-16ch: Discovery of A Probable Supernova in MSPM 00984

ATel #8763; W. Wiethoff (University of Minnesota, Duluth), J. Brimacombe (Coral Towers Observatory), J. S. Brown, T. W.-S. Holoien, K. Z. Stanek, C. S. Kochanek, D. Godoy-Rivera, U. Basu (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, Ping Chen (KIAA-PKU), G. Bock (Runaway Bay Observatory, Australia), E. Conseil (Association Francaise des Observateurs d'Etoiles Variables), I. Cruz (Cruz Observatory), J. M. Fernandez (Observatory Inmaculada del Molino), G. Masi (Virtual Telescope Project, Ceccano, Italy)
on 2 Mar 2016; 13:15 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Jonathan Brown (brown@astronomy.ohio-state.edu)

Subjects: Optical, Supernovae, Transient

Referred to by ATel #: 8771

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 MSPM 00984.

ASASSN-16ch (AT 2016aqz) was discovered in images obtained on UT 2016-03-01.60 at V~16.9 mag. We do not detect (V>17.1) the object in images taken on UT 2016-02-21.40 and before. An image obtained on 2016-03-02 by W. Wiethoff confirms the discovery of the transient. This figure shows the archival SDSS g-band image of the host (left) and the W. Weithoff confirmation image (right). The red circle has a radius of 5" and is centered on the position of the transient in the W. Weithoff image.

The position of ASASSN-16ch is approximately 0.1" South and 2.7" East from the center of the galaxy MSPM 00984 (z=0.026440, d=115 Mpc, via NED), giving an absolute V-band magnitude of approximately -18.5 (m-M=35.31, A_V=0.069). 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-16ch  13:11:58.00    14:33:58.98      2016-03-01.60      16.9          -18.5               2.7 
 
Obs. UT Date         V mag 
2016-02-21.40        >17.1 
2016-03-01.60         16.9 

Follow-up observations are encouraged.

While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-16xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-16xx (AT2016xyz) to preserve, rather than anonymize, the origin of the transient.

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.