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MASTER-SAAO optical transient: Novalike type of variability

ATel #7503; V. Shumkov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, O. Gress, S. Yazev, V. Poleshchuk (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University), V. Shumkov, S. Shurpakov (MASTER-Team)
on 13 May 2015; 21:19 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Nova, Transient, Variables

MASTER OT J172540.91+114744.4 discovery - Novalike (NL) type of variability

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 25m 40.91s +11d 47m 44.4s on 2015-05-10.96431 UT. The OT unfiltered magnitude is 18.0m (limit is 19.1m).

There are 10 images with OT on 2015-05-(10.951 - 10.974) in MASTER-SAAO database. There are about 200 images with this OT in MASTER-Amur, Tunka and Kislovodsk databases since 2010-04-21.044UT as well as on the CRTS since 2006-06-18 (17.65 CV).

But. There is no object at the position on the POSS I and POSS II images.

So we assume Novalike (NL) type of variability for this MASTER OT.

Spectral observations are required.

The discovery images are available at https://master.sai.msu.ru/static/OT/MASTER172540.91114744.4.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net