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MASTER discovery: blue bright OT during FERMI 496473540 (GRB160925A) inspection

ATel #9548; O. Gress, V. Lipunov (Lomonosov MSU), D. Buckley(SAAO), N. Tiurina, E. Gorbovskoy, P. Balanutsa, A. Kuznetsov, V. Kornilov, V. Vladimirov, V. Shumkov, T. Pogrosheva (Lomonosov MSU, SAI), R. Rebolo Lopez, M. Serra Ricart (IAC), Podesta R. (OAFA), Levato H.(ICATE), S. Potter(SAAO), N. Lodieu (IAC), Saffe C.(ICATE), Lopez C., Podesta F.(OAFA)
on 25 Sep 2016; 22:38 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Gamma Ray, Gamma-Ray Burst, Transient

Referred to by ATel #: 9553

MASTER OT J222817.90-145657.4 discovery - blue bright OT inside Fermi error-box, Ampl>6m, no known VIZIER sources
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 22h 28m 17.90s -14d 56m 57.4s on 2016-09-25.75053 UT during automatically inspection of Fermi trigger 496473540 ( http://gcn.gsfc.nasa.gov/other/496473540.fermi ).
The OT unfiltered magnitude is 15.9m (limit 19.7m).
The OT is seen in 6 images.
The Bmag=15.3, Imag=16.0. Inspection will be continued.
We have reference images without OT on 2016-08-29.86883 UT with unfiltered mlim=20.8m (MASTER-SAAO), on 2016-09-19 04:07:28 UT with mlim=19.4 (MASTER-OAFA).
There is no any sources in VIZIER database inside 5", it means 22m POSS limit and more then 6.1 magnitudes of current outburst.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/222817.90-145657.4.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net