Flaring Quasar and New Bright CV detected by MASTER
ATel #5526; S. Shurpakov, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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 (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 29 Oct 2013; 14:30 UT
Credential Certification: Vladimir Lipunov (firstname.lastname@example.org)
Subjects: Optical, Blazar, Cataclysmic Variable, Quasar, Transient
MASTER OT J083246.08+661700.7 - new flaring quasar
MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 08h 32m 46.08s +66d 17m 00.7s on 2013-10-27.83259 UT. The OT unfiltered magnitude is 18.7m (limit 19.4m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-11-28.80285 UT with unfiltered magnitude limit 19.6m.
The object at quiescence is identical to SDSS J083246.08+661700.2 (u=20.67 g=20.37 r=20.12 i=20.27 z=19.97). There is also an UV source GALEX J083246.1+661659 (FUV=21.96+/-0.14, NUV=20.69+/-0.06) and X-ray counterpart 1SWXRT J083246.7+661703 with a 5.8" error circle formally 4.6" away. Finally, there is an infrared detection WISE J083246.08+661700.0 (W1=15.11+/-0.04, W2=14.03+/-0.05, W3=11.48+/-0.13). Object is listed in Atlas of Radio/X-ray associations (Flesch, 2010) with a 54% probability of being a QSO.
Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/083246.08661700.7.jpg
MASTER OT J234843.23+250250.4 - new bright CV
MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 23h 48m 43.23s +25d 02m 50.4s on 2013-10-29.39759 UT. The OT unfiltered magnitude is 14.4m (limit 17.3m). The OT is seen in 7 images. There is no minor planet at this place. We have reference image without OT on 2012-08-25.70528 UT with unfiltered magnitude limit 18.3m.
The OT at quiescence is identical to the faint blue star SDSS J234843.14+250249.9 (u=20.19 g=20.24 r=20.34 i=20.32 z=20.03) listed in USNO-B catalogue as USNO-B1.0 1150-0578157 (23 48 43.111 +25 02 50.61 B1=19.89 R1=N/A B2=20.28 R2=20.31 I=N/A). The star was in outburst on the Quick-V Palomar plate taken on 1983 Oct. 11. It is included in GSC 2.3.2 with the following magnitudes: Fmag=20.09, jmag=20.07, Vmag=16.30. Nothing is present at this position in 1RXS, 2MASS, GCVS and AAVSO VSX.
This area of sky in Pegasus was observed by NEAT project on 15 nights from 2000 Nov. 22 to 2002 Nov. 10. A total of 40 images were obtained. No outbursts were detected. There are five previous outbursts in Catalina Real-time Transient Survey data: on 2006 June 16 to 16.8m, 2008 Nov. 07 (16.0m), 2009 Aug. 01 (17.6m), 2012 Aug. 28 (16.9m) and 2012 Oct. 21 (15.8m).
Based on the blue color, amplitude of variability (about 5.5m) and presence of previous outbursts we conclude that MASTER OT J234843.23+250250.4 is a new cataclysmic variable of SU UMa (UGSU) type in superoutburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/234843.23250250.4.png
List of Optical Transients discovered by MASTER
Global MASTER Robotic Net