Four OTs discovered by MASTER

ATel #4113; P. Podvorotniy, P. Balanutsa, V. Lipunov, D. Denisenko, V. Shumkov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov (Ural Federal University) K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University) A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS) V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), S. Shurpakov, (MASTER team members), Hugo Levato and Carlos Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio; ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 16 May 2012; 14:20 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J123647.53+382036.9 - PSN

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 12h 36m 47.53s +38d 20m 36.9s on 2012-05-14.75340 UT. The OT unfiltered magnitude is 19.3m (limit 19.8m). The OT is seen in 2 images. There is no minor planet at this place. There are two SDSS8 galaxies: J123647.49+382037.2 and J123647.57+382037.3 with rmag>20 at this place.

We have reference image without OT on 2011-03-24.74927 UT with unfiltered magnitude limit 20.0m.

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/123647.53382036.9_1.png

MASTER OT J142512.37+140403.2 - flare of the new UV Ceti star?

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 14h 25m 12.37s +14d 04m 03.2s on 2012-05-14.69851 UT. The OT unfiltered magnitude is 17.7m (limit 20.0m). The OT is seen in 3 images. There is no minor planet at this place.

We have reference image without OT on 2011-02-25.82119 UT with unfiltered magnitude limit 19.8m.

The object is identical to the star SDSS J142512.30+140403.2 with g=23.63(49), r=22.09(19), i=19.89(5), z=18.56(5). Nothing is present at this position in Palomar plates and in USNO-B1.0. There is no object at the OT position in AAVSO VSX, 2MASS, 1RXS and GALEX catalogs. No previous outbursts were found in Palomar/NEAT and CRTS databases.

Based on the red color in SDSS and amplitude of variability we suggest that MASTER OT J142512.37+140403.2 is a flare of the previously unknown variable star of UV Ceti type (flaring red dwarf).

Follow up observations are required. The discovery and reference images are available at http://master.sai.msu.ru/static/OT/142512.37140403.2_1.png

MASTER OT J132403.36+071627.0 - ?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 13h 24m 03.36s +07d 16m 27.0s on 2012-05-15.89201 UT. The OT unfiltered magnitude is 18.7m (limit 19.7m). The OT is seen in 1 image. There is no minor planet at this place. There are no any galaxies within 10arcsec offset.

We have reference image without OT on 2011-01-13.11157 UT with unfiltered magnitude limit 21.0.

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/132403.36071627.0.png

MASTER OT J132422.40+055802.0 - ?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 13h 24m 22.40s +05d 58m 02.0s on 2012-05-15.89201 UT. The OT unfiltered magnitude is 18.5m (limit 19.7m). The OT is seen in 2 images. There are no minor planet and other objects at this place. We have reference image without OT on 2011-01-13.11402 UT with unfiltered magnitude limit 21.0m.

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/132422.40055802.0.png

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