Аннотация: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