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Three OTs discovered by MASTER

ATel #4749; S. Shurpakov, P. Balanutsa, V. Shumkov, D. Denisenko, V. Lipunov, 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, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova, (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), V. Yecheistov, P. Podvorotny (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 20 Jan 2013; 09:47 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae

MASTER OT J125151.70+471618.0 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 12h 51m 51.70s +47d 16m 18.0s on 2013-01-16.98860 UT. The OT unfiltered magnitude is 19.1m (limit 19.5m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-03-02.89241 UT with unfiltered magnitude limit 19.7m. There is SDSS galaxy J125152.01+471620.0 with 3.8 arcsec offset. Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/125151.71471618.0.png

MASTER OT J034718.64+400122.9 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 03h 47m 18.64s +40d 01m 22.9s on 2013-01-18.50438 UT. The OT unfiltered magnitude is 17.4m (limit 18.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-10-18.73455 UT with unfiltered magnitude limit 19.1m.

There is a star SDSS J034718.51+400121.4 within 2" of the OT with the following magnitudes: u=22.90(28), g=22.68(10), r=22.19(10), i=21.69(9), z=21.33(22). Previous outburst to 18.1m was detected on a single MASTER-Kislovodsk image on 2010-12-16.762 UT.

No object is present at this position in 2MASS, USNO-B1.0, GSC 2.3.2, GALEX and 1RXS catalogs, as well as in GCVS and AAVSO VSX. This area of sky in Perseus is not covered by CRTS and Palomar/NEAT.

Based on the amplitude of variability and previous detection we conclude that MASTER OT J034718.64+400122.9 is a new cataclysmic variable in outburst, probably a superoutburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/034718.64400122.9_1.png

MASTER OT J231025.12+380037.5 – New Bright CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 23h 10m 25.12s +38d 00m 37.5s on 2013-01-18.68524 UT. The OT unfiltered magnitude is 16.0m (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 2012-09-16.86442 UT with unfiltered magnitude limit 20.0m.

There is nothing at this position in 2MASS, USNO-B1.0, GALEX and 1RXS catalogs, as well as in GCVS and AAVSO VSX. No previous outbursts were detected by Palomar/NEAT and CRTS.

The star was in outburst on the 1995-08-28 infrared DSS plate, but at quiescence on 8 other plates. It is present in GSC 2.3.2 with the coordinates 23 10 25.040 +38 00 36.65 and magnitudes jmag=22.06 (at minimum), Nmag=16.02 (outburst). Comparison of color-combined (BRIR) digitized Palomar plates is uploaded to http://master.sai.msu.ru/static/OT/J231025+380037-BRIR4x4.jpg (4'x4' field of view at 200% zoom).

Based on the amplitude of variability and presence of a previous outburst we conclude that MASTER OT J231025.12+380037.5 is a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/231025.12380037.5.png

List of optical transients discovered by MASTER

Global MASTER Robotic Net