MASTER: 6 optical transients

ATel #9120; O. Gress, P. Balanutsa, V. Vladimirov, V. Lipunov (Lomonosov MSU), D. Buckley(SAAO), A. Tlatov(KSS), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, I. Gorbunov, V. Shumkov, Kochutina N. (Lomonosov Moscow State Univeristy, SAI), S. Potter, A. Kniazev(SAAO), V. Senik, D. Dormidontov, A. Parkhomenko (Kislovodsk Solar Station, Pulkovo observatory)
on 6 Jun 2016; 10:20 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J200308.64+023410.4 discovery - dwarf nova outburst, ampl>5.6m
MASTER-IAC auto-detection system (Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L) discovered OT source at (RA, Dec) = 20h 03m 08.64s +02d 34m 10.4s on 2016-06-02.14910 UT with unfiltered m_OT=16.3m (mlim=18.8m).
There are 9 images with OT.We have reference image without OT on 2015-10-12.82019UT, unfilt. mlim=19.7m (MASTER unfiltered W is calibrated to USNO-B1 as 0.2B+0.8R).
There is GSC star with only blue 21.32(22mag POSS limit to Red), i.e.ampl>5.6m. The discovery and reference images are http://master.sai.msu.ru/static/OT/200308.64023410.4.png

MASTER OT J180241.86+090312.9 discovery - dwarf nova, no VIZIER data, ampl>3.8m
MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 18h 02m 41.86s +09d 03m 12.9s on 2016-06-05.13306 UT with unfiltered m_OT=18.2m(mlim=19.6)
The OT is seen in 10 images.There is reference image without OT on 2016-03-10.19389 UT mlim=19.9m.
There is no known sources in VIZIER database, it means 22m POSS limits and ampl>3.8m.
The discovery and reference images are http://master.sai.msu.ru/static/OT/180241.86090312.9.png

MASTER OT J130523.22-033819.6 discovery - dwarf nova outburst, ampl>3.3m
MASTER-SAAO auto-detection system discovered OT source at (RA,Dec)=13h 05m 23.22s -03d 38m 19.6s on 2016-05-30.810UT with unfiltered m_OT=18.7m(mlim=20.3).
The OT is seen in 4 images. We have reference image without OT on 2015-05-21.89800 UT with unfiltered magnitude limit 19.6m.
There is no known VIZIER sources. The discovery and reference images are http://master.sai.msu.ru/static/OT/MASTEROTJ130523.22-033819.6.jpg

MASTER OT J190901.75-343617.3 discovery - UG outburst,ampl>5.1m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec)=19h 09m 01.75s -34d 36m 17.3s on 2016-06-02.08521UT with unfiltered m_OT=16.9m(mlim=19.3).
The OT is seen in 3 images. There is no USNO-B1 star, it means the 22m upper limit to minimum and ampl>5.1. There is GSC2.3.2 star and GALEX source =>accretion to white dwarf, i.e. UG.
We have reference image without OT on 2015-05-19.97662UT, mlim=19.5m.

MASTER OT J145949.09-194555.3 discovery
MASTER-IAC auto-detection system discovered OT source at (RA,Dec)=14h 59m 49.09s -19d 45m 55.3s on 2016-06-02.03126UT with unfiltered m_OT=17.8m (limit 19.6m).
There are 3 images with OT.Reference image without it is on 2016-04-13.03639UT, mlim=19.6m.
The discovery and reference images are http://master.sai.msu.ru/static/OT/145949.09-194555.3.png

MASTER OT J194732.04+405021.8 discovery
MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 47m 32.04s +40d 50m 21.8s on 2016-06-03.91119 UT with unfiltered m_OT=17.3m(mlim=18.7m). The OT is seen in 6 images. We have reference image without OT on 2014-09-03.78622UT,mlim=19.5m. The discovery and reference images http://master.sai.msu.ru/static/OT/194732.04405021.8.png

Spectral observations are required for all OT.

MASTER Global Robotic Net