MASTER-Kislovodsk discovery: high amplitude CV outburst

ATel #11503; P. Balanutsa, V. Lipunov, V. Kornilov, E. Gorbovskoy, N. Tiurina (Lomonosov MSU), V. Senik, A. Tlatov, D. Dormidontov (KSS of Pulkovo observatory), R. Rebolo Lopez, M. Serra-Ricart (IAC), A. Gabovich, V. Yurkov (Blagoveschensk SPU), A. Kuznetsov, O. Gress, V. Vladimirov, Yu. Ishmuhametova, D. Zimnukhov, V. Chazov, D. Kuvshinov (Lomonosov MSU), V. Shumkov, T. Pogrosheva
on 5 Apr 2018; 15:16 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J181909.82+253407.7 discovery - dwarf nova outburst, ampl>6m

MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 18h 19m 09.82s +25d 34m 07.7s on 2018-04-04.88163 UT during inspection.
The OT unfiltered magnitude is 16.0m (limit 17.6m). The OT is seen in 3 images in MASTER-Kislovodsk.
This OT was also detected by MASTER-IAC auto-detection system on 2018-04-04 06:01:15.291UT with unfiltered m_OT=16.0
and by MASTER-Amur on 2018-04-03 16:08:08.021UT with unfiltered m_OT=16.4.
There are reference images without OT on 2017-11-27 16:04:16UT with unfiltered mlim=19.5, on 2012-04-30.02567 UT with unfiltered mlim=19.9m.
There is only Pan-STARRS optical source(Chambers+, 2016) with rmag=21.40,gmag=21.51 on 2012-07-10 13:03:49UT in VIZIER database, it means 22m POSS limit and more then 6m of current outburst amplitude.
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Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ181909.82+253407.7.jpg

MASTER Global Robotic Net