[vsnet-alert 19528] MASTER OT J073325.52+373744.9 (ATEL)

[Taichi Kato]

MASTER OT J073325.52+373744.9 (ATEL)

   There was at least one past outburst in the CRTS data
(15.9 on 2008 Jan. 31).  The other two bright detections
were not recorded on the same nights.  Noise or flare?
Time-resolved photometry is of course encouraged.

==============================================================================
ATEL #8730							     ATEL #8730

Title:	MASTER-Kislovodsk: bright OT with 7mag amplitude
Author:	O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), N. Samus
		(INASAN, Lomonosov MSU), N. Tiurina, P. Balanutsa, V. Vladimirov,
		A. Kuznetsov, V. Kornilov, V. Shumkov, I. Gorbunov, D. Vlasenko, D.
		Kuvshinov (Lomonosov Moscow State University, SAI), , A. Tlatov, V.
		Senik, D. Dormidontov, A. Parkhomenko(Kislovodsk Solar Station, Main
		Pulkovo observatory)
Queries:	tiurina at sai.msu.ru
Posted:	25 Feb 2016; 08:23 UT
Subjects:Optical, Request for Observations, Cataclysmic Variable,
		Transient, Variables

MASTER OT J073325.52+373744.9 discovery -  outburst with Ampl>7m, Nova
or dwarf nova?

MASTER-Kislovodsk auto-detection system ( <A HREF="http://www.hindawi.com/journals/aa/2010/349171/">Lipunov
et al., "MASTER Global Robotic Net",   
Advances in Astronomy, 2010</A> )discovered OT source at (RA, Dec) = 07h
33m 25.52s +37d 37m 44.9s on 2016-02-24.90468 UT.

The OT unfiltered magnitude is 

15.1m

(limit 18.0m).The OT is seen in 3 images. There is no minor planet at
this place.  

We have the following reference images without OT:

2015-11-20 20:16:45 19.6 (MASTER-Tunka)

2015-09-24 20:24:29 19.1 (MASTER-Tunka)

2015-02-18 14:46:28 19.5 (MASTER-Tunka)

2014-10-26 01:46:21 20.4 (MASTER-Kislovodsk)

2013-11-27 19:22:56 19.5 (MASTER-Tunka)

2012-01-27 17:01:13 20.2 (MASTER-Tunka)

2011-11-05 20:39:29 20.3 (MASTER-Tunka)

2011-01-25 14:17:22 20.1 (MASTER-Tunka)

2011-10-28 02:23:13 20.3 (MASTER-Kislovodsk)

There is <a href="http://skyserver.sdss.org/dr9/en/tools/quicklook/quickobj.asp?id=1237651272952971758">SDSS
star</a> in 0.5"  with u=22.1(=-0.3),g=21.9(+-0.1),r=22.1(=-0.2),i=22.5,
so we suggest the dwarf nova outburt with Ampl>7m. 

Spectral observations are required. 

The discovery and reference images are available at  
http://master.sai.msu.ru/static/OT/MASTEROTJ073325.52373744.9.png 

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

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