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ASAS-SN Discovery of a Possible Bright Galactic Nova ASASSN-17mt

ATel #10772; K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson (OSU), L. Chomiuk, J. Strader (MSU), T. W.-S. Holoien, B. J. Shappee (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 24 Sep 2017; 18:50 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Nova

Referred to by ATel #: 10774, 10785, 10795, 10977

During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from the quadruple 14-cm "Cassius" telescope in CTIO, Chile, we detect a bright, new transient source, possibly a classical nova (could also be a bright CV), near the Galactic plane

 
Object       RA (J2000)    DEC (J2000)    Gal l (deg)   Gal b (deg)    Disc. UT Date   Disc. V mag  
ASASSN-17mt  08:50:29.576  -47:45:28.56    267.191       -2.319        2017-09-24.39     11.3 

ASASSN-17mt was discovered in images obtained on UT 2017-09-24.39 V~11.3, and it is also detected at UT 2017-09-23.40 at V~11.3. There was an ~80-day seasonal gap before these observations, so the nova candidate could have peaked already. We do not detect (V>16.9) this object in subtracted images taken on UT 2017-07-07.95 and before.

Using ASAS-SN Sky Patrol public all-sky light curve interface (Kochanek et al. 2017), we have retrieved aperture photometry time series at the location of ASASSN-17mt, and the resulting light curve can be seen here. No previous outbursts or variability are detected at the position of ASASSN-17mt since ASAS-SN started observing this location in February 2016.

Follow-up observations, especially spectroscopy, are strongly encouraged.

We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University, NSF grant AST-1515927, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA). Happy Birthday to MtS.