MASTER: OT with 4.6m amplitude

ATel #11977; O. Gress, V. Lipunov, V. Senik, E. Gorbovskoy, V. Kornilov, N. Tiurina, A. Kuznetsov, P. Balanutsa, D. Vlasenko, D. Zimnukhov, V. Chazov (Lomonosov MSU, SAI), A. Tlatov, D. Dormidontov (Kislovodsk solar station of the Pulkovo observatory), R. Rebolo, M. Serra-Ricart (IAC), D. Buckley (SAAO), N. Budnev (ISU), A. Gabovich, V. Yurkov, Y. Sergienko (Blagoveshchensk Educational University), V. Shumkov
on 22 Aug 2018; 16:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J014523.44+210208.2 detection - OT with ampl>4.6m (preliminary dwarf nova outburst)

MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 01h 45m 23.44s +21d 02m 08.2s on 2018-08-21.89405 UT.
The OT unfiltered magnitude is 17.2m (limit 19.2m).
The OT is seen in 4 images (2018-08-21 21:27:26/22:19:25 UT). There is no minor planet at this place.
We have reference images without OT
at 2014-10-21.01245 UT with 20.2m unfiltered magnitude limit (MASTER-Kislovodsk),
at 2014-11-14 15:23:18UT with mlim=20.3 (MASTER-Tunka),
at 2016-09-28 03:21:49UT and at 2015-08-16 05:14:10UT with mlim=20.5 (MASTER-IAC),
at 2016-08-06 02:27:11UT with mlim=20.1 (MASTER-SAAO).
There is USNO-B1 star with B2=21.06 (and 22m of Rmag limit, that gives MASTER_W=0.2B+0.8R=21.8m lim in history and more then 4.6m of current outburst amplitude) Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/014523.44210208.2.png

MASTER Global Robotic Net