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THE ASTRONOMER Electronic Circular No 3171      2016 May 26 14.06UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise,  Basingstoke,
Hants, RG22 4PP,England.Telephone/FAX(01256)471074Int:+441256471074
INTERNET: GUY@TAHQ.DEMON.CO.UK      Backup: gmh@wdcc1.bnsc.rl.ac.uk
WORLD WIDE WEB                         http://www.theastronomer.org
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ASASSN-16FM: PROBABLE SUPERNOVA WITH NO APPARENT HOST GALAXY

S. Villanueva Jr., et. al., (Ohio State) and others report on ATEL 9080 that
during ASAS-SN, using data from the quadruple 14-cm "Brutus" telescope in
Haleakala, Hawaii, they discovered a new transient source, most likely a
supernova, with no apparent host galaxy. 

ASASSN-16fm (AT 2016cny) was discovered in images of 2016 May 13.59UT at
V~16.9. They also detect the object in images of 
2016 May 19.47UT (V~16.7) and 2016 May 22..58UT (V~17.1) but not recorded on
May 3.58UT and before.

Figure and location: 
www.astronomy.ohio-state.edu/~assassin/followup/asassn-16fm.png

There is no apparent host galaxy within the vicinity of ASASSN-16fm, which
could be indicative of an unusually luminous transient. However, the
transient is relatively close to the Galactic plane (l,b=63.7532,-8.2003;
A_V=1.2), making a less luminous, local transient a plausible alternative.
Properties of the new source and photometry are summarized in the tables
below: 

RA (J2000)   DEC (J2000)  Disc. UT Date   Disc. V mag
20:22:50.125 +22:42:09.66 2016 May 13.59      16.9  

Obs. UT Date         V mag 
2016-05-03.58        >17.9 
2016-05-13.59         16.9 
2016-05-19.47         16.7 
2016-05-22.58         17.1 

Editor: Images of the field would be welcomed.

Guy M Hurst