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The 1000-th MASTER detection and SALT limit: Fast Doublet OT

ATel #8442; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov Moscow State University), D. Buckley, A. Kniazev (South Africa Astronomical Observatory), N. Tiurina, V. Kornilov, N. Samus, A. Kuznetsov, D. Vlasenko, I. Gorbunov, E. Popova, V. Vladimirov, V. Shumkov (M. V. Lomonosov Moscow State University, SAI MSU), S. Potter, M. Kotze (South African Astronomical Observatory), O. Gress, N. Budnev, S. Yazev, K. Ivanov (Irkutsk State University, Applied Physics Institute), A. Tlatov, V. Senik, D. Dormidontov, A. V. Parhomenko (Kislovodsk Solar Station of the Pulkovo Observatory),V. Yurkov, Yu. Sergienko, A. Gabovich, E. Sinyakov (Blagoveschensk Educational State University, Blagoveschensk), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE), Ricardo Podesta, Claudio Mallamaci, Carlos Lopez and Federico Podesta (Observatorio Astronomico Felix Aguilar (OAFA)
on 19 Dec 2015; 21:56 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Transient

MASTER OT J051014.58-290900.6 - ?

MASTER-SAAO auto-detection system (Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171) discovered the 1000th OT source at (RA, Dec) = 05h 10m 14.58s -29d 09m 00.6s on 2015-12-16.97115 UT.
The OT unfiltered magnitude is 18.8m (the limit is 20.4m).
There were the set of 3 images. This OT is visible on 2 of them:
on the 1st exposition(23:18:27UT) and on the 3-th expositon(23:40:07UT).
But OT does not visible between them on the second exposition(23:29:16UT).
We have reference image without OT on 2015-02-19.89856 UT with unfiltered magnitude limit 20.3m.
MASTER-SAAO reobserved this OT on 2015-12-17 19:13:07UT with unfiltered m_lim=20.9, there is no OT at this time.
There is no known sources in VIZIER database at this place (it means the 22m POSS limit before).
There was no registered GRB alerts at this area and time.

SALT observed this are on 2015 Dec with 120s expositions with the following limits:

w = 24.9   00:48:35.227 (unfiltered)
B = 24.2   00:53:55.893
g' = 24.7   00:56:40.808
i' = 24.9   00:59:00.177

Never such type of variability was observed before on this time scale (Nikolay Samus).

Follow up observations (X-ray or Radio) are required.

The discovery image is available here .

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net