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MASTER Detection of the Large Amplitude Red Dwarf Flare

ATel #6752; V. Shumkov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), S. Shurpakov (MASTER team member)
on 25 Nov 2014; 18:57 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Transient, Variables

MASTER OT J235333.47+101459.0 - large amplitude flaring red dwarf

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 23h 53m 33.47s +10d 14m 59.0s on 2014-11-25.72481 UT. The OT unfiltered magnitude is 16.3m (limit 19.8m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2014-11-25.67499 UT (1.2 hr earlier) with unfiltered magnitude limit 20.2m. The object has reached maximum on the second of three images (180-sec exposures): 17:22:16 UT, 17.84m; 17:23:44 UT, 16.28m; 17:25:15 UT, 16.49m.

The OT at quiescence is identical to the red star SDSS J235333.45+101458.9 (g=25.65 r=24.79 i=21.58) = AllWISE J235333.47+101458.4 (W1=16.63 W2=16.69). The object is not present in USNO-B, 2MASS, GCVS and AAVSO VSX.

Based on the red color and short flare duration, MASTER OT J235333.47+101459.0 is a new variable of UV Ceti type (flaring red dwarf). The flare amplitude in white light is about 7 magnitudes. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/235333.47101459.0.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net