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Flare Star and Possible Supernova discovered by MASTER

ATel #6652; V. Shumkov, P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, E. Popova, V. Vladimirov (Lomonosov Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, O. Gress, E. Konstantinov, O. Chuvalaev, V. Poleshchuk (Irkutsk State University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), S. Shurpakov (MASTER team member)
on 31 Oct 2014; 18:14 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Supernovae, Transient

MASTER OT J210324.05+011233.5 - possible flaring star

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 21h 03m 24.05s +01d 12m 33.5s on 2014-10-28.50986 UT. The OT unfiltered magnitude is 17.8m (limit 17.9m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-08-29.64876 UT with unfiltered magnitude limit 19.0m. The object has quickly brightened between the images (60-sec exposures): 12:12:27 UT, 18.9m; 12:14:12 UT, 17.8m. It was not detected to the limiting magnitude 19.4m on images obtained the next night (Oct. 29 at 12:21 and 14:05 UT).

There is a red star SDSS J210323.82+011234.4 (g=25.03 r=23.04 i=22.24 z=21.32) within 3" of the OT. The object is not present in GCVS and AAVSO VSX.

Based on the red color and short flare duration, MASTER OT J210324.05+011233.5 is likely a new variable of UV Ceti type (flaring red dwarf). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/210324.05011233.5.png

MASTER OT J235002.10+255114.0 - PSN

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 23h 50m 02.10s +25d 51m 14.0s on 2014-10-29.62178 UT. The OT unfiltered magnitude is 19.2m (limit 19.9m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2010-09-30.61970 UT with unfiltered magnitude limit 19.8m.

The OT is located 2" east and 0" south of galaxy SDSS J235001.96+255114.4 (g=22.00 r=21.21 i=20.96). Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/235002.10255114.0.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net