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Three OTs discovered by MASTER

ATel #4378; P. Podvorotny,, S. Shurpakov, P. Balanutsa, D. Denisenko, E. Gorbovskoy, N. Tiurina, ,V. Lipunov, 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 (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. Shumkov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 17 Sep 2012; 08:40 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Quasar, Supernovae

OT MASTER J162101.40+683138.9 - PSN in PGC1768827? (founded by V. Shurpakov)

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 02h 01m 29.65s +26d 15m 40.4s on 2012-09-16.97896 UT. The OT unfiltered magnitude is 18.5m (limit 19.8m). The OT is seen in 2 image. There is no minor planet at this place.

We have reference image without OT on 2010-12-09.71550 UT with unfiltered magnitude limit 20.1m.

The OT have offset 9.1W and 49.5N from PGC1768827

There is a faint star within 2" of OT at the limit of POSS-I blue plates taken on 1953 June 14 and 1955 Apr. 23, but not on seven other DSS plates. Nothing is present at this position in 2MASS, USNO-B1.0 and 1RXS catalogs, as well as in GCVS and AAVSO VSX. This area is not covered by SDSS and GALEX.

We suggest that MASTER J162101.40+683138.9 is a PSN or new cataclysmic variable (dwarf nova) in outburst.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/020129.65261540.4.png

MASTER J215751.35+152046.8 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 21h 57m 51.35s +15d 20m 46.8s on 2012-09-13.87523 UT. The OT unfiltered magnitude is 18.7m (limit 19.7m). The OT is seen in 7 images. There is no minor planet at this place. We have reference image without OT on 2010-11-09.65095 UT with unfiltered magnitude limit 20.3m.

This object has an ultraviolet counterpart GALEX J215751.3+152047 with UV magnitudes FUV=21.45+/-0.23 and NUV=20.61+/-0.11. The star is also present in SDSS DR8 as SDSS J215751.34+152046.7 with the following magnitudes: u=20.83 g=20.28 r=20.21 i=20.25 z=20.30.

There is a faint blue star on the 2nd epoch Palomar plates with GSC coordinates 21 57 51.346 +15 20 46.10 and magnitude j=22.07. Nothing is present at this position in 2MASS, USNO-B1.0 and 1RXS catalogs, as well as in GCVS and AAVSO VSX.

Based on the blue color we suggest that MASTER J215751.35+152046.8 is a new cataclysmic variable. Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/215751.35152046.8_1.png

OT MASTER J021835.49+004039.7 - flare in active quasar

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 02h 18m 35.49s +00d 40m 39.7s on 2012-09-16.02013 UT. The OT unfiltered magnitude is 18.2m (limit 19.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2011-01-10.63973 UT with unfiltered magnitude limit 21.5m.

This object is identical to SDSS J021835.44+004039.2 (u=22.39 g=21.72 r=21.07 i=20.58 z=20.01) - QSO with z=3.877

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/021835.49004039.7.png

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