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New Bright Optical Object on South Hemisphere detected by MASTER at the X-Ray source position.

ATel #10258; Yu. A. Gagarin, S. P. Korolev, V. Lipunov, T. Pogrosheva (Lomonosov MSU), E. Gorbovskoy, N. Tiurina, P. Balanutsa, O. Gress, A. Kuznetsov, V. Shumkov, E. Popova, V. Vladimirov, V. Kornilov, I. Gorbunov, A. Krylov, V. Chazov (Lomonosov MSU, SAI), R. Podesta (OAFA), H. Levato (ICATE), C. Lopez, C. Saffe (ICATE), A. Gabovich (BSPU), R. Rebolo, M. Serra-Ricart (IAC)
on 12 Apr 2017; 12:40 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, X-ray, Cataclysmic Variable, Transient, Variables

Referred to by ATel #: 10308

MASTER OT J174534.82-643044.4 discovery - OT connected with X-ray object from XMM-Newton Serendipitous Source Catalogue.

MASTER-OAFA auto-detection (Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) system discovered OT source at (RA, Dec) = 17h 45m 34.82s -64d 30m 44.4s with 0.7 arcsec error on 2017-04-12.25627 UT.

OT unfiltered magnitude is 16.7m (mlimit=18.2m).

The OT is seen in 3 images. There is no minor planet at this place.

We have reference image without OT on 2017-01-27.30657 UT with magnitude limit in unfiltered 19.8m.

There is no known optical sources in VIZIER database, it means 22m POSS limit in history and current outburst's amplitude more then 5.3m

There is XMM-Newton Serendipitous Source Catalogue X-ray object J174534.8-643044 inside our error box.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTEROTJ174534.82-643044.4.jpg

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net