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MASTER-IAC: very bright high amplitude OT

ATel #9266; 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)
on 25 Jul 2016; 09:07 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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 ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) 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

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net