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MASTER: OT discovered during inspection of HESE 58537957 trigger

ATel #9425; N. Tyurina, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, V. Kornilov, D. Kuvshinov, D. Vlasenko, O. Gress, K. Ivanov, V. Shumkov (Lomonosov Moscow State University, SAI), S. Potter (South African Astronomical Observatory)
on 30 Aug 2016; 00:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Neutrinos, Request for Observations, Transient

Referred to by ATel #: 9456

MASTER OT J130845.02-323254.9 - optical transient detection during inspection of HESE 58537957_128340 alert

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 13h 08m 45.02s -32d 32m 54.9s on 2016-08-24.73811 UT during inspection of HESE alert ( 58537957 trigger number ) http://gcn.gsfc.nasa.gov/notices_amon/58537957_128340.amon .
The OT unfiltered magnitude is 19.6m (limit 20.5m).
The OT is seen in 12 images. There is no minor planet at this place.
We have reference image without OT on 2015-02-20.01763 UT with unfiltered magnitude limit 20.5m.
Spectral observations are required (preliminary possible classification is dwarf nova).

The discovery and reference images are http://observ.pereplet.ru/images/HESE58537957MASTER.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net