MASTER: QSO 5mag optical flare

ATel #12078; N. Budnev (API ISU), D. Zimnukhov, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, D. Vlasenko, V. Chazov, V. Senik (Lomonosov Moscow State University, SAI), A. Gabovich, V. Yurkov, Y. Sergienko (Blagoveshchensk Educational University), A. Tlatov(Kislovodsk Solar Station of Pulkovo observatory), V. Shumkov, T. Pogrosheva
on 4 Oct 2018; 09:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J041758.27-025019.0 detection - QSO optical flare(5mag amplitude)

MASTER-Tunka auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 04h 17m 58.27s -02d 50m 19.0s on 2018-10-01.86697 UT.
The OT unfiltered magnitude is 17.0m (limit 18.8m).
The OT is seen in 6 images. There is no minor planet at this place.
We have reference image without OT on 2010-09-20.88556 UT with unfiltered magnitude limit 19.4m |(MASTER-Tunka), on 2015-12-18 18:13:44UT with mlim=19.0, on 2012-09-28 01:34:33 with mlim=19.4 (MASTER-Kislovodsk), .

There are previous outbursts in MASTER-Kislovodsk database
Date,UT | unfiltered_magnitude
2010-09-21 00:56:26.899 19.5
2010-11-13 20:29:27 <18.9 (marginally seen, mlim=18.9)
2011-10-28 22:19:23.329 17.0
2012-09-28 00:34:26.238 17.6
2014-02-15 17:27:13.053 16.5

There is no USNO-B1 sources, there is GSC2.3.2 blue source with jmag=22.19.
This source is also radio source and a WISE candidate to gamma-ray blazar radio sources (D'Abrusco et al. 2014)
Spectral observations are required.
The discovery and reference images are available at
http://master.sai.msu.ru/static/OT/MASTEROTJ041758.27-025019.0.jpg

MASTER Global Robotic Net