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PSN and two Flare Stars detected by MASTER

ATel #5952; V. Shumkov, P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 6 Mar 2014; 14:05 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Star, Supernovae, Transient, Variables

MASTER OT J115330.85+633618.4 - possible Supernova

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 11h 53m 30.85s +63d 36m 18.4s on 2014-03-03.63780 UT. The OT unfiltered magnitude is 17.1m (limit 18.0m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-08-21.58654 UT with unfiltered magnitude limit 18.9m. The OT was confirmed by MASTER-Tunka telescope on 2014-03-04.740 and 04.758 UT at unfiltered magnitude 17.4m and coordinates 11h 53m 30.68s +63d 36m 19.2s.

The new object is located 29" east and 0" south of the center of galaxy PGC 2658384 = 2MASX J11532641+6336187 = SDSS J115326.45+633619.2 (g=15.83 r=14.97 i=14.55) with z=0.04586. Spectral confirmation is required. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/115330.85633618.4.png

MASTER OT J143453.02+023616.1 - new large amplitude UV Ceti star

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 14h 34m 53.02s +02d 36m 16.1s on 2014-03-03.78563 UT. The OT unfiltered magnitude is 15.1m (limit 17.3m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2013-04-02.73222 UT with unfiltered magnitude limit 19.6m. The object was quickly fading: 2014-03-03.785 UT, 14.88m; 03.786, 15.07m; 03.788, 15.64m. It was not detected on the second triplet of images on 2014-03-03.918 UT to 16.0m.

The OT at quiescence is identical to the star SDSS J143453.11+023616.6 (g=24.16 r=21.91 i=19.34) = 2MASS J14345311+0236165 (J=15.92+/-0.08 H=15.32+/-0.10 K=15.15+/-0.17) - red dwarf of M7 spectral class. The flare amplitude in the white light was at least 6m. Follow up observations are desirable. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/143453.02023616.1.png

MASTER OT J163710.57+064432.4 - new UV Ceti star

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 16h 37m 10.57s +06d 44m 32.4s on 2014-03-03.99640 UT. The OT unfiltered magnitude is 16.3m (limit 18.4m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-05-18.97356 UT with unfiltered magnitude limit 19.4m. The object is showing the fast variability. It was not detected on 2014-03-03.994 UT to the limiting magnitude 18.1, appeared on 03.995 UT at 17.3m, and brightened by 03.996 UT to 16.3m. It was not detected on the second triplet of images obtained an hour later, on 2014-03-04.040 UT (limit 17.6m).

The OT at quiescence is identical to the red star USNO-B1.0 0967-0299781 (16 37 10.626 +06 44 30.33 B2=N/A R2=19.60 I=18.49) = 2MASS J16371052+0644308 (J=16.28+/-0.10 H=15.68+/-0.15 K=15.30+/-0.18). Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J163710+064432-BRIR.jpg (10'x10' FOV). There is nothing at this position in GCVS and AAVSO VSX. Based on the color, short rise time and amplitude of variability it is definitely a flaring red dwarf. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/163710.57064432.4.jpg

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net