MASTER: optical transients without history
ATel #8121; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), N. Tiurina, V. Kornilov, A. Kuznetsov, I. Gorbunov, D. Vlasenko, E. Popova, V. Shumkov (M. V.Lomonosov Moscow State University, SAI), S. Potter, M. Kotze (South African Astronomical Observatory), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute) V. Krushinsky (Ural Federal University)
on 5 Oct 2015; 10:48 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables
MASTER OT J060938.37-582158.2 discovery - new dwarf nova outburst, Ampl>5.6m
MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 06h 09m 38.37s -58d 21m 58.2s on 2015-10-05.07265 UT.
The OT unfiltered magnitude is 16.4m (limit 20.3m).
The OT is seen in 5 images. There is no minor planet at this place. We have reference images without OT on 2015-04-08.77456 UT with unfiltered magnitude limit 20.6m. There is no any source in VIZIER database at this place. So we suggest the amplitude more then 5.6m for this possible dwarf nova outburst
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ060938.37-582158.2.png
MASTER OT J031121.54-601851.0 discovery - optical transient with Ampl>5m ?
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 03h 11m 21.54s -60d 18m 51.0s on 2015-10-05.03351 UT.
The OT unfiltered magnitude is 17.0m (limit 19.9m).The OT is seen in 6 images on 2015-10-05, and in 16 images on 2015-07-03, 2015-03-26, 2015-02-09, 2015-01-04 with the same m_OT. There is no minor planet at this place. There is no sources at this place at POSS, 2MASS, WISE images.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ031121.54-601851.0.png
MASTER Global Robotic Net
