MASTER Net: optical transients detection

ATel #11620; T. Pogrosheva, O. Gress, V. Vladimirov, V. Lipunov(Lomonosov MSU), R. Rebolo, M. Serra-Ricart (IAC), R. Podesta, F. Podesta, C. Francile (OAFA), H. Levato, C. Saffe (ICATE), E. Gorbovskoy, N. Tiurina, V. Kornilov, P. Balanutsa, A. Kuznetsov, I. Gorbunov, D. Zimnukhov, V. Chazov, D. Vlasenko, V. Shumkov, V. Senik, D. Kuvshinov (Lomonosov Moscow State University, SAI), A. Gabovich, V. Yurkov (BSPU)
on 8 May 2018; 13:17 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J170147.31+054540.1 detection - outburst with ampl>3.1m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net",Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 17h 01m 47.31s +05d 45m 40.1s on 2018-05-06.23063 UT.
The OT unfiltered magnitude is 17.4m (mlim=18.0m).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image without OT on 2018-04-16 03:50:46UT with unfilt.mlim=19.1 (MASTER-IAC), on 2017-09-02.01481 UT with unfilt.magnitude limit 18.6m (MASTER-OAFA). There is USNO-B1 star with B2=20.74,R2=20.44, it means more then 3.1 ampl of current outburst (MASTER W=0.2B+0.8R calibrated by USNO-B1)
Spectral observations are required. The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/170147.31054540.1.png

MASTER OT J013413.80+645940.0 detection - variable star, amplitude of variability is~5m.

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 01h 34m 13.80s +64d 59m 40.0s on 2018-04-29.72919 UT.
The OT unfiltered magnitude is 15.0m (mlim=17.3m).
The OT is seen in (automatic preliminary photometry, unfiltered)
MASTER-Amur database: 2010-04-10 17:47:04 (m_OT=15.0); 2018-04-08 19:44:46.65 (15.0), 2018-04-29 17:22:38.404 (15.0)
MASTER-Tunka: 2012-01-30 20:07:41.974 (14.2), 2013-06-19 19:01:50.579 (14.2), 2014-10-04 15:46:08.669 (15.0), 2015-04-15 17:23:14.647 (15.0), 2017-08-29 16:17:27.638 (15.1)
MASTER-Kislovodsk: 2015-05-23 21:58:10.032 (15.1), 2016-08-03 18:32:16.668(15.0)

There is GSC2.3.2 star in 2.8" with red_fmag=19.09,blue_jmag=22.11 in 1991.697 (VIZIER);
and PanSTARRS star with rmag=20.0619 in 2011-09-13

Spectral observations are required.
MASTER-Amur detection images are:
http://master.sai.msu.ru/static/OT/013413.80645940.0.png

MASTER OT J072007.30+451611.6 - short optical burst/flare detection

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 07h 20m 07.30s +45d 16m 11.6s on 2018-04-26.93115 UT.
The OT unfiltered magnitude is 17.0m (limit 18.8m). The OT is seen in 6 images in both MASTER tubes. There is no minor planet/satell/debris at this place. Preliminary automatic photometry : 2018-04-26 23:07:32 no OT
2018-04-26 22:24:30 17.0
2018-04-26 22:22:53 17.2
2018-04-26 22:20:51 17.2
2018-04-26 22:20:51 17.0
2018-04-26 22:19:12 17.0
2018-04-26 22:17:23 17.0
2018-04-26 22:15:26 17.1
2018-04-26 22:15:26 17.0
2018-04-26 21:30:39 no OT
We have reference image without OT on 2011-11-03.92271 UT with unfiltered magnitude limit 18.3m.
There is USNO-B1 star in 1" with B2=19.65,R2=19.16, no J,H,K, very unusual for UVCet-type.
Spectral observations are required.
The detection and reference images are:
http://master.sai.msu.ru/static/OT/072007.30451611.6.png

MASTER Global Robotic Net