MASTER: PSN and 2 outbursts

ATel #13481; T. Pogrosheva, E. Gorbovskoy, V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra (IAC), D. Buckley (SAAO), V. Kornilov, O. Gress, N. Tiurina, P. Balanutsa, I. Gorbunov, A. Kuznetsov, V. Vladimirov, D. Vlasenko, D. Zimnukhov, D. Cheryasov, V. Senik, K. Zhirkov, A. Pozdnyakov, A. Chasovnikov, V. Grinshpun, E. Minkina(Lomonosov MSU), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA), H. Levato(ICATE), N. M. Budnev, O. Ershova(ISU, API), A. Tlatov, D. Dormidontov(Kislovodsk Solar Station of the Pulkovo Observatory),V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk ESU)
on 14 Feb 2020; 11:21 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J060717.51-491308.3 discovery - PSN in 22.5"W, 0"S from the center of PGC479195

AT2020clz
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net",Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 06h 07m 17.51s -49d 13m 08.3s on 2020-02-13.00944 UT.
The OT unfiltered magnitude is 17.6m (mlim=19.1).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2018-12-29.95317 UT with unfiltered mlim=21.0m.
This PSN is in 22.5"W, 0"S from the center of PGC479195
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/060717.51-491308.3.png

MASTER OT J075234.24-495613.1 discovery - OT, prelim., dwarf nova outburst, ampl>3.6m

AT2020clf
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 52m 34.24s -49d 56m 13.1s on 2020-02-12.90208 UT.
The OT unfiltered magnitude is 18.4m (mlim=19.2).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2015-03-14.83670 UT with unfiltered mlim= 20.6m. There is no any sources inside 4" in VIZIER database (POSS limit 22m gives current amlitude more then 3.6m), the nearest source is in 4.4" GAIA source with Gmag=20.38.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/075234.24-495613.1.png

MASTER OT J144805.35-510904.7 discovery - outburst amplitude >4.3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 14h 48m 05.35s -51d 09m 04.7s on 2020-02-13.08076 UT.
The OT is seen in 2 images. There is no minor planet at this place. 22mag DSS limit (USNO-B1) in history gives >4.3m of f current outburst amplitude
We have reference image on 2017-09-18.79698 UT with unfiltered mlim= 19.7m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/144805.35-510904.7.png

MASTER Global Robotic Net