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MASTER-OAFA: OT detection during inspection

ATel #10045; O. Gress, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, P. Balanutsa, V. Kornilov, V. Chazov, I. Gorbunov, A. Krylov (Lomonosov MSU, SAI), C. Lopez, F. Podesta (OAFA), C. Saffe (ICATE), V. Shumkov, T. Pogrosheva
on 3 Feb 2017; 09:39 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT J183627.60-473518.1 detection during Fermi 507696568 trigger inspection

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 18h 36m 27.60s -47d 35m 18.1s on 2017-02-02.36706 UT.
The OT unfiltered magnitude is 16.2m (mlim=18.1m).
This OT was detected during Fermi trigger 507696568 inspection https://gcn.gsfc.nasa.gov/other/507696568.fermi (GRB_TIME: 2017-02-02 02:49:23.77 UT) .

The OT is seen in 3 images:
2017-02-02 08:37:10.668 16.0
2017-02-02 08:48:34.421 16.0
2017-02-03 08:38:15.671 16.7 (this values means no connection with GRB counterpart, most possibly dwarf nova outburst)
We have reference image without OT on 2016-08-07.07241 UT with 19.4m unfiltered magnitude limit.
There is USNO-B1 star in 0.8" with R1=20.02, B2=18.65, it means current outburst amplitude more then 3m (MASTER W is calibrated by USNO as W=0.2B+0.8R)
Spectral observations are required.
The discovery and reference images are
http://master.sai.msu.ru/static/OT/MASTEROTJ183627.60-473518.1.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net