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MASTER: high amplitude dwarf novae outbursts.

ATel #12146; V. Shumkov, T. Pogrosheva, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE),D. Buckley(SAAO),V. Kornilov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Vladimirov, O. Gress, A. Krylov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), A. Gabovich (BSPU)
on 29 Oct 2018; 00:22 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J103856.73-265613.7 discovery - prelimin.dwarf nova outburst with ampl>6.3m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 10h 38m 56.73s -26d 56m 13.7s on 2018-10-19 02:50:11.47
The OT is seen in 16 images.

The OT unfiltered magnitude are
2018-10-19 02:50:11.47 15.7m MASTER-SAAO
2018-10-25 02:22:32.389 16.3 MASTER-SAAO
2018-10-27.32896 UT 16.6 MASTER-OAFA.

We have reference image without OT on 2018-03-11.30734 UT with 19.4m unfiltered magnitude limit .
There is no sources inside 3" in VIZIER database.The nearest source is only PanSTARRS one in 3.1", it means 22m of POSS limit in history and more then 6.3mag of current outburst amplitude
Spectral observations are required.
MASTER-OAFA images are available at
http://master.sai.msu.ru/static/OT/103856.73-265613.7.png

MASTER OT J091558.28-675805.0 discovery - prelimin.dwarf nova outburst with ampl>5.3m

MASTER-OAFA auto-detection system
discovered OT source at (RA, Dec) = 09h 15m 58.28s -67d 58m 05.0s on 2018-10-28.29309 UT.
The OT unfiltered magnitude is 16.7m (mlim=18.1m).
The OT is seen in 15 images. There is no minor planet at this place.
We have reference image without OT on 2017-12-07.07549 UT with 18.7m. magnitude limit
There is no sources inside 3" in VIZIER database.The nearest source is only GSC2.3.2one in 3.7" (S4QJ021914), in any case there was 22m POSS limit in history and more then 5.3m of current outburst amplitude.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/091558.28-675805.0.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net