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MASTER OT in HI4Pi marked area during Fermi 519133191 inspection

ATel #10494; V. Shumkov, V. Lipunov (Lomonosov MSU), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, O. Gress, T. Pogrosheva, V. Chazov, D. Vlasenko, V. Vladimirov, I. Gorbunov, A. Krylov, D. Kuvshinov (Lomonosov Moscow State University, SAI), A. Gabovich (BSPU)
on 15 Jun 2017; 12:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Radio, Optical, Gamma Ray, Request for Observations, Gamma-Ray Burst, Transient, Variables

MASTER OT J144027.85+482551.2 discovery - new OT, ampl>4.5m

MASTER-Tavrida auto-detection system( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 14h 40m 27.85s +48d 25m 51.2s on 2017-06-14.80883 UT during Fermi trigger 519133191 inspection (GRBtime=17/06/14 11:39:46.66, NoticeTime with Rer.b.=1.86d is 19:06:22UT, RADec(2000)=14 42 50 +47 30 00).
The OT unfiltered magnitude is 17.5m (mlimit 19.6m).

The OT is seen in 9 inspection images.
We have reference image without OT on 2017-05-22.85682 UT with unfiltered magnitude limit 20.4m.
There is no any sources in VIZIER database (-> 22m POSS limit and more then 4.5m of outburst amplitude).
But this area was covered during HI survey by Leiden/Argentine/Bonn Survey and later by Parks and Effelsberg-Bonn H I Survey .
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ144027.85482551.2.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net