MASTER OT J013318.91+305213.7 - possible microlensing event in M33

ATel #14976; K. Zhirkov, V. Lipunov, V. Kornilov, E. Gorbovskoy, N. Tyurina, P. Balanutsa, A. Kuznetsov, D. Vlasenko, Ya. Kechin, D. Zimnukhov, V. Vladimirov, V. Senik, A. Chasovnikov, V. Topolev, T. Pogrosheva, D. Cheryasov (Lomonosov Moscow State University, SAI, PhysicsDepartment), O. A. Gres, N. M. Budnev (Irkutsk State University, API), C. Francile, R. Podesta, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveschensk Educational StateUniversity)
on 16 Oct 2021; 15:07 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J013318.91+305213.7 detection - possible microlensing event

MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 01h 33m 18.91s +30d 52m 13.7s on 2021-10-11.82150 UT in regular survey operations. The OT unfiltered magnitude is 19.4m (mlim=20.2).
The OT is seen in 20 images ( 2021-10-06 16:24:04 2021-10-15 19:56:29 ). There is no minor planet at this place.
We have reference image on 2011-09-22.05760 UT with unfiltered mlim= 20.2m.
Spectral observations are required.
The transient is also detected in the ATLAS (Tonry et al. , 2018, PASP, 130f4505T; Smartt et al. 2016 APJL, 827, 40)
data https://fallingstar-data.com/forcedphot/queue/123132/plot.pdf
Spectral bservations and photometry are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/013318.91305213.7.png