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THE ASTRONOMER Electronic Circular No 2987      2014 Mar 07 20.16UT
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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MASTER OT J105545.20+573109.7 - NEW LARGE AMPLITUDE CV IN UMA
V. Vladmiriov et. al., Moscow State University and others report on The
Astronomer's Telegram 5950 their discovery with the MASTER-Tunka
auto-detection system an optical transient source (OT) at:
RA 10h 55m 45.20s DEC +57d 31' 09.7" on 2014 Mar 04.748UT. The OT unfiltered
magnitude is 15.5m (limit 18.8m). It is recorded on five images. They have
reference image without OT on 2011 April 05.577UT with unfiltered magnitude
limit 20.1m. 

The OT at quiescence is identical to the blue star SDSS
J105545.15+573110.1 (u=22.39 g=22.16 r=21.88 i=22.55 z=21.91). There is also
an UV counterpart GALEX J105545.2+573109 (FUV=23.44+/-0.10 NUV=22.75+/-0.07)
and X-ray source 2XMM J105545.1+573109 = CXO J105545.2+573109. 

There is nothing at this position in 1RXS, 2MASS, USNO, GCVS and AAVSO VSX.
No previous outbursts were detected by CSS. This area of sky in Ursa Major
is not covered by NEAT. 

Based on the blue colour and outburst amplitude (~6m), MASTER OT
J105545.20+573109.7 is most likely a dwarf nova of SU UMa (UGSU) type in
superoutburst. The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/105545.20573109.7.png 


Sergey Shurpakov e-mails the following magnitudes:
MASTER OT J105545.20+573109.7
  20140304.748  15.49C  MASTER-Tunka
  20140304.745  15.52C  MASTER-Tunka
  20140304.751  15.43C  MASTER-Tunka
  20140304.793  15.60C  MASTER-Tunka
  20140304.796  15.46C  MASTER-Tunka
Internal photometric errors are 0.04m.

SUPERNOVA 2014K IN PGC 24869 (GIANCARLO CORTINI)
2014K   Jan 22.98   08 51 08.15  +71 50 33.9  15.4:  1  "W    7  "N      
Denis Bucynski reports magnitude 15.8 on Jan 23.088 (Portmahomack, U.K.;
0.35-m reflector + ST9XME camera; position end figures 08s.26, 33".2; UCAC-3
reference stars)
L. Tomasella: spectrum Jan 25 normal type-Ia supernova about 20 days after
B-band maximum according to a match with SN 1994D.

SUPERNOVA 2014L IN MESSIER 99 (THU-NAOC TRANSIENT SURVEY)
2014L   Jan 26.83   12 18 48.68  +14 24 43.5  17.2  13.8"W   15.9"S  
K. Itagaki (Japan, 0.50-m reflector) found a trace of 2014L on a
pre-discovery CCD image from 2014 Jan. 24.847.
W.-X. Li: spectrum Jan 27 type-Ic
J.-J. Zhang: spectrum Jan 27 type-Ic around maximum light.

Guy M Hurst