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THE ASTRONOMER Electronic Circular No 3134      2015 Dec 30 11.30UT
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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POSSIBLE SUPERNOVA IN NGC 7213 (ASASSN-15US)
J. S. Brown et. al., reports on behalf of ASAS-SN (Assassin) on The
Astronomer's Telegram 8474 that during the ongoing All Sky Automated Survey
for SuperNovae, using data from the quadruple 14-cm "Cassius" telescope in
Cerro Tololo, Chile, they discovered a new transient source, most likely a
supernova, in the nearby galaxy NGC 7213. 

ASASSN-15us was discovered in images obtained on UT 2015 Dec 29.03 at V~14.7
mag. They also detected the object in images obtained on UT 2015 Dec 25.05
(V~16.1) but not recorded on 2015 Dec 22.06 and before. Images appear at:
http://www.astronomy.ohio-state.edu/~assassin/followup/asassn-15us.png
The discovery image (middle), and the archival DSS image of the host
(right). The red circle has a radius of 15" and is centred on the position
of the transient in the discovery image.  

The position of ASASSN-15us is approximately 117" North and 68" West from
the centre of the galaxy NGC 7213 (z=0.005839, d=21.2 Mpc, via NED), giving
an absolute V-band magnitude of approximately -17.0 (m-M=31.63, A_V=0.04).
Properties of the new source and photometry are summarized in the 
below: 
Object       RA (J2000)    DEC (J2000)  Disc. UT Date Disc. V mag
ASASSN-15us  22:09:09.641 -47:08:02.48  2015-12-29.03 14.7-17.0

Obs. UT Date         V mag 
2015-12-22.06        >17.1 
2015-12-25.05         16.1 
2015-12-29.03         14.7 

Overseas subscribers and others with access to robotic telescopes are
encouraged to report any further observations of this bright object.

Guy M Hurst