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ASAS-SN Discovery of a Possible Galactic Nova ASASSN-17gw on the Rise

ATel #10436; K. Z. Stanek, C. S. Kochanek (OSU), L. Chomiuk, J. Strader (MSU), J. S. Brown, T. W.-S. Holoien, J. V. Shields, T. A. Thompson (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), J. Brimacombe (Coral Towers Observatory)
on 29 May 2017; 15:29 UT
Distributed as an Instant Email Notice Novae
Credential Certification: Krzysztof Stanek (stanek.32@osu.edu)

Subjects: Optical, Nova

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 center

 
Object       RA (J2000)    DEC (J2000)    Gal l (deg)   Gal b (deg)    Disc. UT Date   Disc. V mag 
ASASSN-17gw  18:24:40.917  -30:13:58.95     2.998        -8.056        2017-05-29.21     13.7 
ASASSN-17gw was discovered in images obtained on UT 2017-05-29.21 at V~13.7, and it is also detected on 2017-05-28.29 at V~15.2. We do not detect (V>17.1) this object in subtracted images taken on UT 2017-05-22.36 and before. No previous outbursts are detected at this location since ASAS-SN started observing this field in March 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).