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MASTER: bright PSN in IC2597 at SWIFT X-ray source position

ATel #8196; E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov, I. Gorbunov, D. Vlasenko (M. V.Lomonosov Moscow State University, SAI), S. Potter, A. Knyazev, M. Kotze (South African Astronomical Observatory), R. Rebolo Lopez, M. Serra-Ricart, G. Israelian, N. Lodieu, L. Suarez-Andres ( Instituto de Astrofisica de Canarias), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinskiy (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 20 Oct 2015; 15:41 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, X-ray, Request for Observations, Supernovae, Transient, Variables

Referred to by ATel #: 8201, 8497

MASTER OT J103747.94-270507.2 discovery - bright PSN(16.5m) in IC2597(12.8m)

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 10h 37m 47.94s -27d 05m 07.2s on 2015-10-20.09346 UT.

The OT unfiltered magnitude is 16.5m (limit 18.7m).
This OT is seen in 9 images. There is no minor planet at this place. We have reference images without OT on 2015-07-18 with m_lim=19.5. This PSN is in 7.8"E and 14.7"S from center of the elliptical IC2597 (12.8mag,(m-M)~32.2)
There is SWIFT X-ray source in 3.8" from our PSN - 1SWXRT J103747.7-270510 with 6.5" positional error at 68 % confidence level.

This may be accedental coincidente or it may be optical flare of the more distant AGN.

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/103747.94-270507.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net