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Possible Supernova and Flare Star discovered by MASTER

ATel #5692; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, A. Rufanov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), 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), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 25 Dec 2013; 13:20 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Supernovae, Transient, Variables

MASTER OT J073252.76+292953.0 - possible Supernova

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 07h 32m 52.76s +29d 29m 53.0s on 2013-12-23.88166 UT. The OT unfiltered magnitude is 17.8m (limit 18.8m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-12-06.96914 UT with unfiltered magnitude limit 21.0m.

The OT is located 1" east and 5" south of the center of galaxy SDSS J073252.61+292958.8 (g=18.95 r=18.25 i=17.87). Sum of six 60-sec exposures on 2013 Dec. 23 is uploaded to http://master.sai.msu.ru/static/OT/J073252+292953-MASTER-Kislovodsk.jpg

The OT has been reported to CBAT TOCP as PSN J07325276+2929530. Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/073252.76292953.0.png

MASTER OT J084319.20+480131.5 - flaring red dwarf

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 08h 43m 19.20s +48d 01m 31.5s on 2013-12-23.91519 UT. The OT unfiltered magnitude is 17.7m (limit 18.9m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2011-11-30.89828 UT with unfiltered magnitude limit 19.9m. The object was not visible on 21:54:48 UT unfiltered image (60-sec exposure, m_lim=19.0). It was first detected on 21:56:18 UT at 18.5m and brightened to 17.7m on 21:57:52 UT. It was not visible on the second triplet of images obtained 45 minutes later, at 22:43-22:46 UT (m_lim=19.0).

The OT at quiescence is identical to the red star SDSS J084319.19+480132.5 (g=24.93 r=23.37 i=21.00 z=19.46). There is nothing at this position in 1RXS, USNO, 2MASS, GCVS and AAVSO VSX.

Based on the color, amplitude and short rise time MASTER OT J084319.20+480131.5 is the 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/084319.20480131.5.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net