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MASTER :optical transient detection during automatic Fermi trigger 458235025 inspection

ATel #7784; N. Tyurina, V. Lipunov, E. Gorbovskoy, V. Kornilov, P. Balanutsa, A. Kuznetsov, V. Chazov, D. Vlasenko, I. Gorbunov, V. Vladimirov, E. Popova, D. Kuvshinov(Lomonosov Moscow State University, Sternberg Astronomical Institute), O. Gress, N. M.Budnev, K. Ivanov, S. Yazev (Applied Physics Institute, Irkutsk State University), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov, V. Senik, A. V. Parhomenko (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University), Shumkov V. P., Shurpakov S. (MASTER-Team)
on 11 Jul 2015; 00:26 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Quasar, Transient, Variables

MASTER OT J071803.26+644745.0 - possible QSO flare

MASTER-Tunka auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered the burst ( GCN #18007 ) at (RA, Dec) = 07h 18m 03.26s +64d 47m 45.0s on 2015-07-10.74346 UT during automatic inspection of Fermi trigger 458235025's error-box.
The OT outburst's unfiltered magnitude is 14.5m (the limit is 17.2m).

There are 6 images with optical transient's outburst. MASTER-Net has more than 50 reference images with quiet OT, for ex., on 2014-03-26.54329 UT with 20.3 unfiltered magnitude limit. 2015-06-01 16:54:40 is the last previous quiet state (MASTER-Tunka images).
This OT is identical to USNO-B1 star with B2=17.93, R2=17.97, I=17.66; also known as GALEX source (NUV=18.863, FUV=19.241) and as the source from SDSS DR10 catalogue of candidate quasars (Brescia+, 2015). Previous outburst was detected as ASASSN-15bq and classified as dwarf nova outburst (UG, AAVSO).

Spectral observations are required.
The outburst discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ071803.26+644745.0.jpg .

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net