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MASTER-SAAO: short OT detection

ATel #9574; T. Pogrosheva, V. Lipunov, V. Chazov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, P. Balanutsa, V. Kornilov, O. Gress (Lomonosov Moscow State University, SAI), S. Potter (SAAO)
on 30 Sep 2016; 10:42 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Transient

MASTER004526.42-883200.3 discovery - the short OT, amplitude is more then 3.3m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 00h 45m 26.42s -88d 32m 00.3s on 2016-09-23.96355 UT.
The OT unfiltered m=18.7m (mlim=20.8m).

The OT is seen on 5 unfiltered images (180s every exposition, T=t_start):
in East tube (non-parallel mode) at 2016-09-23 22:40:07, 22:43:46, 22:47:26UT with m_OT=19.8 (mlim=20.1-20.3);
in West tube at 2016-09-23 23:07:31UT with m_OT=18.7, at 2016-09-23 23:11:09UT m_OT~mlim=20.2.

We have reference image with marginally seen OT on 2016-08-04 21:46:48 with m_OT~20.8 and mlim=20.8.
There was no satellites and their parts inside 4sq.deg. at this time.
There is 22m POSS upper limit and a WISE source in 0.5" in VIZIER database with W1(3.4 microns)=16.1, W2=16.26 ( W1-W2 is not typical for UVCet), W3=13.2, W4=9.05, no JHK.
It means the amplitude of OT is more then 2m in maximum from August MASTER 20.8 value, and more then 3.3m from POSS limit.

Deep photometry and spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/004526.42-883200.3.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net