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THE ASTRONOMER Electronic Circular No 2988      2014 Mar 19 10.08UT
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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SUPERNOVA 2014aa IN NGC 3861
On 2014 March 8 at 01h54mUT a message was received from Ron Arbour that he
had discovered a suspected supernova of magnitude 15.7V (unfiltered) in NGC
3861 during searches for the UK Nova/Supernova patrol. It was detected on an
unfiltered CCD image (limiting magnitude 19.0) taken on 2014 Mar 07.9912UT
using a 0.35-m f/6 Schmidt Cassegrain Telescope and SXVF H9 CCDd camera. The
object was also recorded on twenty subsequent images to a limiting
unfiltered magnitude of about 19.0.
The precise position is:
RA 11h 45m 03.58s DEC +19° 58' 25.4" (2000); offsets from galaxy:   4" W
0" S
The object was not visible on the Digitised Sky Survey POSS II Blue plate
(1986 Mar 03) or the POSS II Red plate (1992 Apr 28) or listed on CBAT's
Minor Planet Checker.

Additional CCD magnitudes for 2014aa:  Mar. 9.004, 15.7 (Gianluca Masi et.
al. remotely using a 0.43-m f/6.8 corrected Dall-Kirkham robotic telescope
near Ceccano, Italy; position end figures 03s.53, 25".1); 9.021, 15.2
(Giancarlo Cortini, Predappio, Italy; 0.35-m Schmidt-Cassegrain telescope +
SXVR H-9 camera; limiting mag 19.0).

L. Tomasella et. al. (INAF Osservatorio Astronomico di Padova)
Report on The Astronomer's Telegram 5958 that an optical spectrogram (range
340-820 nm; resolution 1.3 nm), obtained on 2014 March 8.99UT with the
Asiago 1.82-m Copernico Telescope (+ AFOSC), shows it to be a type-Ia
supernova. Adopting for the host galaxy (NGC 3861)  the redshift z =
0.016982 a good match is found with several type-Ia supernovae about one
week before B-band maximum light. An expansion velocity of about 13900 km/s
is derived from the minimum of the Si II 635-nm line.

The Asiago classification spectra are posted at URL
http://sngroup.oapd.inaf.it; classification was made via GELATO (Harutyunyan
et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007, Ap.J. 666,
1024).

Congratulations to Ron on the discovery of this further supernova.

Guy M Hurst