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MASTER-SAAO: blue OT and new short bright OT

ATel #10574; V. Vladimirov, O. Gress, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, V. Kornilov, V. Chazov, N. Tiurina, P. Balanutsa, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Shumkov, T. Pogrosheva, D. Kuvshinov (Lomonosov Moscow State University, SAI)
on 15 Jul 2017; 00:11 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J011146.67-810821.2 discovery - possible dwarf nova with ampl>4.4m
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 01h 11m 46.67s -81d 08m 21.2s on 2017-07-14.07693 UT.
The OT unfiltered magnitude is 17.6m (mlim=20.0).
The OT is seen in 4 images. There is no minor planet at this place.
We have reference image on 2016-09-23.90785 UT with unfiltered mlim= 20.4m.
There is GSC2.3 star in 0.4" with only blue jmag=21.7, it means more then 4.4m of current outburst ampl.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/011146.67-810821.2.png

MASTER OT J015329.20-651114.0 discovery - short(<90s) bright(17.5) OT
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 01h 53m 29.20s -65d 11m 14.0s on 2017-07-14.02723 UT.
The OT unfiltered magnitude is 17.5m (mlim=19.8).
The OT is seen in 1 images:
no OT on 2017-07-14 01:28:35 UT up to unfiltered mlim=18.9m
OT on 2017-07-14 01:30:56UT with m_OT=17.5
no OT on 2017-07-14 01:32:43UT with mlim=19.1
Exposition was 60s.

There is no minor planet at this place (MPC database inside 15'). There is no human satellites or their parts outside
We have reference image on 2015-10-11.94758 UT with unfiltered mlim= 21.1m.
There is no any sources inside 5" in VIZIER database.
Deep photometry is required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/015329.20-651114.0.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net