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MASTER: PSN in PGC883918 and short OT

ATel #10893; P. Balanutsa, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Rebolo, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, O. Gress, A. Kuznetsov, V. Kornilov, I. Gorbunov, I. Gorbunov, D. Zimnuhov, D. Vlasenko, A. Rezaeva, V. Vladimirov, D. Kuvshinov (Lomonosov Moscow State University, SAI), V. Shumkov, T. Pogrosheva
on 25 Oct 2017; 10:45 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J102725.40-172356.7 discovery - PSN in PGC883918

MASTER-SAAO auto-detection system
( Lipunov et al., "MASTER Global Robotic Net",Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 10h 27m 25.40s -17d 23m 56.7s on 2017-10-24.1072 UT.
The OT unfiltered magnitude is 17.4m (mlim=18.64). The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2015-03-15.0663 UT with unfiltered mlim= 19.0m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ102725.40-172356.7.jpg

MASTER OT J011700.59-105906.0 discovery - short OT

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 01h 17m 00.59s -10d 59m 06.0s on 2017-10-24.02622 UT.
The OT unfiltered magnitude is 19.3m (mlim=20.5).
The OT is seen in 3 images:
2017-10-24 00:37:45.844 m_OT=19.5
2017-10-24 00:41:24.297 m_OT=19.3
2017-10-24 00:45:03.272 m_OT=19.7
202017-10-24 01:55:20UT m_lim=20.3, no OT
There is no minor planet at this place (the nearest (96825) 1999 RA185 is in 2.7W,2.8N - not our OT, see image) .
We have reference image on 2017-09-25.03440 UT with unfiltered mlim= 20.8m.
Deep photomtry is required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/011700.59-105906.0.png

MASTER OT J053534.55-145921.2 discovery - UVCet

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 05h 35m 34.55s -14d 59m 21.2s on 2017-10-23.01501 UT.

The OT unfiltered magnitude is 19.5m (mlim=19.7).
The OT is seen in 3 image. 2017-10-23 00:21:37 m_OT=19.8+-0.3
2017-10-23 00:25:18 m_OT=19.5+-0.2
2017-10-23 00:32:51 m_OT~20.0+-0.5
2017-10-23 01:29:45 no OT up mlim=20.8
There is no minor planet at this place.
There is Wise source in 1.4 VIZIER database, so it can be UVCet flare
We have reference image on 2016-09-08.13229 UT with unfiltered mlim=20.3m.
The dicoveyr and reference images are available at:
http://master.sai.msu.ru/static/OT/053534.55-145921.2.png

MASTER Global Robotic Net