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Three new CVs detected by MASTER

ATel #5572; D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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 Pulkovo Observatory), 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 12 Nov 2013; 11:56 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J054741.00+392657.4 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 05h 47m 41.00s +39d 26m 57.4s on 2013-11-10.67352 UT. The OT unfiltered magnitude is 15.5m (limit 18.3m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-08-21.76176 UT with unfiltered magnitude limit 18.4m.

The OT at quiescence is identical to the star USNO-A2.0 1275-05487993 (05 47 41.01 +39 26 57.9 R=17.7 B=18.6) and USNO-B1.0 1294-0146619 (05 47 41.008 +39 26 58.28 pmRA=-2 pmDE=6 B1=19.23 R1=17.29 B2=16.87 R2=17.99 I=17.14). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J054741+392657-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J054741.0+392658 (NUV=17.19+/-0.04) and infrared source 2MASS 05474096+3926578 (J=16.63+/-0.12, H=15.68+/-0.15, K=15.48+/-0.16).

There is nothing at this position in 1RXS, GCVS and AAVSO VSX. Object was at minimum light on 6 DSS plates and on 13 NEAT images obtained on 3 different nights from 2001 Dec. 20 to 2002 Feb. 02. This area of sky in Auriga is not covered by SDSS and CRTS.

Based on the color and outburst amplitude (~3m), MASTER OT J054741.00+392657.4 is most likely a dwarf nova of SS Cyg (UGSS) type in outburst. Follow up observations are desirable. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/054741.00392657.4.jpg

MASTER OT J024847.86+501239.7 - new large-amplitude CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 02h 48m 47.86s +50d 12m 39.7s on 2013-11-11.51531 UT. The OT unfiltered magnitude is 15.6m (limit 18.1m). The OT is seen in 3 images. We have reference image without OT on 2011-12-01.62525 UT with unfiltered magnitude limit 19.7m.

There is a faint blue star near the OT on Palomar plates. It is present in GSC 2.3.2 with cooridantes 02 48 48.079 +50 12 38.51 and jmag=22.11. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J024847+501239-BRIR5x5.jpg (2x zoom). There is also an UV counterpart GALEX J024848.1+501238 (FUV=19.54+/-0.17 NUV=18.86+/-0.07).

There is nothing at this position in 1RXS, USNO-B1, 2MASS, GCVS and AAVSO VSX. This area of sky in Perseus is not covered by SDSS, NEAT and CRTS.

Based on the blue color and outburst amplitude (~6m), MASTER OT J024847.86+501239.7 is most likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/024847.86501239.7.jpg

MASTER OT J053452.42+485934.3 - new large-amplitude CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 05h 34m 52.42s +48d 59m 34.3s on 2013-11-11.73186 UT. The OT magnitude in V filter is 16.5m (limit 17.8m). The OT is seen in 2 images. We have reference image without OT on 2011-02-03.62791 UT with unfiltered magnitude limit 18.9m.

Nothing is visible at this position on digitized Palomar plates. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J053452+485934-BRIR5x5.jpg (2x zoom).

Object is not present in 1RXS, GALEX, USNO-B1, 2MASS, GCVS and AAVSO VSX. This area of sky in Auriga is not covered by SDSS and CRTS. OT is not visible on three NEAT images of 2001 Dec. 23.

Based on the outburst amplitude (at least 5m), MASTER OT J053452.42+485934.3 is likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/053452.42485934.3.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net