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ASAS-SN Discovery of A Likely Galactic Nova ASASSN-16ma on the Rise

ATel #9669; K. Z. Stanek, C. S. Kochanek, J. S. Brown, T. W.-S. Holoien, J. Shields (OSU), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, S. Bose, Ping Chen (KIAA-PKU), L. Chomiuk, J. Strader (MSU), J. Brimacombe (Coral Towers Observatory)
on 26 Oct 2016; 01:28 UT
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Nova

Referred to by ATel #: 9678, 9680, 9683, 9736, 9849

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN or "Assassin"), using data from the quadruple 14-cm "Cassius" telescope in CTIO, Chile, we detect a new transient source, most likely a classical nova, near the Galactic center

Object       RA (J2000)    DEC (J2000)    Gal l (deg)   Gal b (deg)    Disc. UT Date   Disc. V mag 
ASASSN-16ma  18:20:52.12  -28:22:13.52      4.288       -6.468         2016-10-25.02      13.7 
ASASSN-16ma was discovered in images obtained on 2016-10-25.02 at V~13.7 and proceed to brighten to V~11.6 a day later (UT 2016-10-26.02). We do not detect (V>17.3) the object in images taken on UT 2016-10-20.04 and before. No previous outbursts are detected at this location since ASAS-SN started observing the Galactic center in March 2016.

Observation Date    V mag  V err 
2016-10-20.04       >17.3   -- 
2016-10-25.02        13.7  0.02 
2016-10-26.02        11.6  0.01 
Follow-up observations, especially multi-band photometry and spectroscopy, are strongly encouraged.

We thank LCOGT and its staff for their continued support of ASAS-SN. ASAS-SN is supported by NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, and the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU.