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ASAS-SN Discovery of a Possible Galactic Nova ASASSN-18cs

ATel #11300; K. Z. Stanek, C. S. Kochanek, J. V. Shields, T. A. Thompson (OSU), T. W.-S. Holoien, B. J. Shappee (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU)
on 14 Feb 2018; 17:55 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 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-18cs  17:34:08.84   -43:05:50.5     346.74        -5.544        2018-02-13.37      13.7 

ASASSN-18cs was discovered in images obtained on UT 2018-02-13.37 at V~13.7, and it is also detected in g-band data from the "Paczynski" telescope at UT 2018-02-14.38 at g~13.7. There was a ~120-day seasonal gap before these observations, so the nova candidate could have peaked already. We do not detect (V>17.4) this object in subtracted images taken on UT 2017-10-17.03 and before.

We have retrieved V-band image subtraction photometry time series at the location of ASASSN-18cs. No previous outbursts or variability are detected at the position of ASASSN-18cs since ASAS-SN started observing this location in March 2016.

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

We would like to 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, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark).