[vsnet-alert 19995] MASTER OT J204806.68+135423.3 (ATEL)

[Taichi Kato]

MASTER OT J204806.68+135423.3

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ATEL #9266                                                           ATEL #9266

Title:  MASTER-IAC: very bright high amplitude OT
Author: O. Gress, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez, M.
                Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov,
                A. Kuznetsov, D. Kuvshinov, D. Vlasenko, V. Vladimirov, E. Popova,
                V. Chazov (Lomonosov Moscow State University, SAI), G. Israelyan,
                N. Lodieu ( Instituto de Astrofisica de Canarias), N. Budnev, K. Ivanov
                (API, Irkutsk State University)
Queries:        tiurina at sai.msu.ru
Posted: 25 Jul 2016; 09:07 UT
Subjects:Optical, Request for Observations, Variables

MASTER OT J204806.68+135423.3 discovery  - very bright (14.9m) high amplitude
(>7.1m) OT

MASTER-IAC auto-detection system ( <A HREF="http://www.hindawi.com/journals/aa/2010/349171/"
>Lipunov
et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L</A>
)  
discovered OT source at (RA, Dec) = 20h 48m 06.68s +13d 54m 23.3s on 2016-07-24.16661
UT.

The OT unfiltered magnitude is 
14.9m
(limit 18.5m). 

The OT is seen in 3 images. There is no minor planet at this place. We
have reference image without OT on 2015-09-05.87973 UT with unfiltered
magnitude limit 20.4m.

There is no OT on MASTER images at -Amur,-Tunka,-Kislovodsk database since
2009-08-28 18:42:03UT.

There is no OT in POSS images (22m upper limit) and in VIZIER database
inside 4".  
It means the amplitude of current outburst is more then 7.1m

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/204806.68135423.3.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