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MASTER-SAAO: bright optical flare of 2FGL 1725.1-7714 Blazar

ATel #8025; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), N. Tyurina, V. Kornilov, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Chazov (M. V.Lomonosov Moscow State University, SAI), S. Potter, M. Kotze (South African Astronomical Observatory), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias),O. Gress, N. M. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 9 Sep 2015; 11:35 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, AGN, Blazar, Quasar, Transient

MASTER OT J172350.86-771350.3 detection - bright optical flare of 2FGL 1725.1-7714 Blazar with gamma-ray counterpart

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 23m 50.86s -77d 13m 50.3s on 2015-09-08.81221 UT.

The OT unfiltered magnitude is 16.5m (the limit is 19.3m).

There are 3 images with OT. There is no minor planet at this place. We have previous outburst was on 2015-03-13.009UT with unfiltered m_OT=17.7.

We have the following reference images without OT (MASTER-SAAO database) :
Date, UT                  Unfiltered mag limit
2015-08-01 19:36:10   18.7
2015-06-28 22:48:11   18.6
2015-05-03 23:53:40  19.4
2015-04-30 21:42:43   19.0
2015-02-02 00:15:28   18.5
2014-12-19 23:30:02   18.4
2014-12-18 23:37:07   20.0
There is 2FGL J1725.1-7714 Blazar with gamma-ray counterpart, but without a good optical spectrum.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/172350.86-771350.3.png

MASTER Global Robotic Net