MASTER: optical transients detection

ATel #13504; P. Balanutsa, E. Gorbovskoy, V. Lipunov (Lomonosov MSU), D. Buckley(South African Astronomical Observatory), V. Kornilov, N. Tyurina, A. Kuznetsov, F. Balakin, K. Zhirkov, V. Vladimirov, D. Vlasenko, I. Gorbunov, V. Shumkov, T. Pogrosheva, D. Zimnukhov, V. Senik, A. Chasovnikov, D. Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), O. A. Gres, N. M. Budnev, O. Ershova (Irkutsk State University, API), R. Podesta, C. Lopez, F. Podesta, C. Francile(Observatorio Astronomico Felix Aguilar OAFA), H. Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)
on 19 Feb 2020; 20:28 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J164857.22-643351.9 detection - outburst with ampl>4.7m

2020cxs

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 16h 48m 57.22s -64d 33m 51.9s on 2020-02-17.12516 UT.
The OT unfiltered magnitude is 17.3m (mlim=19.4). The OT is seen in 4 images. There is no minor planet at this place.
We have reference image on 2019-08-03.77042 UT with unfiltered mlim= 19.7m.
22m POSS limit in history (MASTER clear m is calibrated by USNO-B1 as 0.2B_2 + 0.8R_2) gives ampl of curret outburst more then 4.7m
There is previous outburst in MASTER database on 2019-05-31 22:00:35UT with m_OT=17.7 and nearest in time reference images without OT on 2019-05-29 20:31:54 with mlim=19.7 and on 2019-06-01 22:30:03UT with mlim=19.0
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/164857.22-643351.9.png

MASTER OT J113720.58-524800.8 discovery - new OT, outburst ampl>3.3m, prelim.dwarf nova (no VIZIER data)
2020cxr

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 37m 20.58s -52d 48m 00.8s on 2020-02-19.12862 UT.
The OT unfiltered magnitude is 18.7m (mlim=19.3).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2019-06-02.84248 UT with unfiltered mlim= 19.7m.The nearest in time reference image is on 2020-02-16 23:43:31Ut with mlim=19.3.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/113720.58-524800.8.png

MASTER OT J132220.96-465133.4 discovery - dwarf nova outburst with ampl>3.5m
2020cxp

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 22m 20.96s -46d 51m 33.4s on 2020-02-19.08700 UT.
The OT unfiltered magnitude is 18.5m (mlim=20.2).
The OT is seen in 5 images. There is no minor planet at this place.
There are previous outbursts in MASTER database on
2015-01-17 01:39:05 m_OT=18.7
2019-02-04 00:59:18 m_OT=18.5
We have reference image on 2014-12-24.08402 UT with unfiltered mlim= 20.0m.
There is Galex source in 0.9" and previous outburst in GSC2.3.2, so 22m POSS limit in history givws current outburst as more then 3.5m
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/132220.96-465133.4.png

MASTER OT J104314.74-693529.4 discovery - outburst aith ampl>4.6m
2020cxq

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 10h 43m 14.74s -69d 35m 29.4s on 2020-02-19.04769 UT.
The OT unfiltered magnitude is 17.4m (mlim=19.8).
The OT is seen in 4 images. There is no minor planet at this place.
We have reference image on 2019-02-09.94147 UT with unfiltered mlim= 19.2m.
There is GSC2.3.2 and VISTa source, it means 22m POSS limit in history and more then 4.6m of current outburst ampl
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/104314.74-693529.4.png

MASTER Global Robotic Net