[vsnet-alert 16359] MASTER OT J040552.59+274716.7 (ATEL)

[Taichi Kato]

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ATEL #5369							     ATEL #5369

Title:	Large-Amplitude Bright Optical Transient in Taurus detected
		by MASTER
Author:	D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, N.
		Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov,
		V. Vladimirov (Moscow State University, SAI), V. Yurkov, Y. Sergienko,
		D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University),
		K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V.
		Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), V. Krushinsky,
		I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), A.
		Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar
		station of the Pulkovo observatory RAS), P. Podvorotny, V. Shumkov,
		S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C.
		Mallamaci, C. Lopez and F. Podest (OAFA)
Queries:	lipunov2007 at gmail.com
Posted:	5 Sep 2013; 21:20 UT
Subjects:Optical, Cataclysmic Variable, Nova, Transient

MASTER OT J040552.59+274716.7 - large amplitude optical transient (CV or
classical Nova)

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 04h
05m 52.59s +27d 47m 16.7s on 2013-09-05.73515 UT. The OT unfiltered magnitude
is 
14.6m
(limit 18.1m). The OT is seen in 6 images. There is no minor planet at
this place. We have reference image without OT on 2013-01-09.53743 UT with
unfiltered magnitude limit 18.6m. The object has brightened to 14.5m on
the second triplet of images obtained 45 minutes later, on 2013-09-05.767
UT. 

There is nothing at this position on the digitized Palomar plates and on
their combination down to ~22m. Color-combined finder chart is uploaded
to http://master.sai.msu.ru/static/OT/J040552+274716-BRIR.jpg (10'x10'
FOV). The object is not present in 1RXS, USNO-B, GSC, 2MASS, GCVS and AAVSO
VSX. This area of sky in Taurus is not covered by GALEX and SDSS. No previous
outbursts were detected by CRTS and <a href="http://skyview.gsfc.nasa.gov/skymorph/skymorph.html">Palomar/NEAT</a>.
Sum of 10 best NEAT images is uploaded to http://master.sai.msu.ru/static/OT/J040552+274716-NEAT.jpg
(5'x5' FOV). 

Based on the outburst amplitude (at least 7.5m) MASTER OT J040552.59+274716.7
is likely a dwarf nova of UGWZ (WZ Sge) type. However, taking into account
the object's location in Taurus, other scenarios (including a classical
Nova eruption) are also possible. Spectral and photometric observations
are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/040552.59274716.7.png

<center><a href="http://observ.pereplet.ru/MASTER_OT.html">List of Optical
Transients discovered by MASTER</a></center>

Global MASTER Robotic Net: http://observ.pereplet.ru
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