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The PSN, CV and QSO Flare discovered by MASTER

ATel #5899; P. Balanutsa, V. Shumkov, S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Tiurina, V. Chazov, A. Kuznetsov, V. Echeistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci(OAFA)
on 18 Feb 2014; 13:29 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Quasar, Supernovae, Transient

Referred to by ATel #: 5977

MASTER OT J163152.63+300645.1 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 16h 31m 52.63s +30d 06m 45.1s on 2014-02-16.81234 UT. The OT unfiltered magnitude is 15.7m (limit 17.1m). The OT is seen in 4 images. We have reference image without OT on 2012-09-05.48694 UT with unfiltered magnitude limit 18.7m. The object was observed in outbursts to 15.7m on MASTER-Amur single images of 2010-06-09.712 UT and 2012-12-19.900 UT, but was not detected as a transient then.

The OT at quiescence is identical to the blue star USNO-B1.0 1201-0247710 (16 31 52.665 +30 06 46.55 B1=20.37 B2=20.73) = SDSS J163152.66+300646.1 (u=17.23 g=16.83 r=17.08 i=17.27 z=17.39). The star was definitely in another outburst during SDSS observations. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J163152+300645-BRIR5x5.jpg (2x zoom). There is also an UV counterpart with two entries in GALEX DR6: GALEX J163152.7+300646 (FUV=21.22+/-0.40 NUV=20.74+/-0.22) and GALEX J163152.6+300647 (FUV=20.78+/-0.28 NUV=20.49+/-0.11).

There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. There is a faint X-ray source in Swift XRT point source catalogue 1SXPS J163152.7+300643 with the flux 0.00099 (+0.00040/-0.00034) cnts/s.

Catalina Sky Survey observed this area of sky in Hercules with 77 positive detections from April 2005 to Sep. 2013. Most of time the object is varying between 20-21m with one outburst to 16.3-16.4m on 2011 May 20.

Based on the blue color and outburst amplitude (~5m), MASTER OT J163152.63+300645.1 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/163152.63300645.1.png

MASTER OT J091013.77+461735.4 - possible Supernova

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 09h 10m 13.77s +46d 17m 35.4s on 2014-02-17.79356 UT. The OT unfiltered magnitude is 17.4m (limit 17.8m). The OT is seen in 3 images. We have reference image without OT on 2011-03-24.63832 UT with unfiltered magnitude limit 21.5m. Sum of six MASTER-Tunka images on 2014 Feb. 17.743-17.836 UT is uploaded to http://master.sai.msu.ru/static/OT/J091013+461735-Tunka-sum.jpg

The OT is located 12" west and 0" south of the center of galaxy PGC 82329 = 2MASX J09101496+4617356 = SDSS J091014.98+461735.8 (g=15.75 r=15.09 i=14.71) with z=0.0267. Spectral confirmation is required. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/091013.77461735.4.png

OT MASTER OT J041758.27-025018.8 - QSO (PKS B0415-029) Flare

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 04h 17m 58.27s -02d 50m 18.8s on 2014-02-15.67390 UT. The OT unfiltered magnitude is 16.8m (limit 18.3m). The OT is seen in 11 images. The OT is coincided with QSO noted as J0417-0250 in VLBA Galactic Plane Survey (Petrov,2011, 2011AJ, 142, 35P)

We have reference image without OT on 2010-09-21.03919 UT with unfiltered magnitude limit 19.8m.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/041758.27-025018.8.png

List of Optical Transients discovered by MASTER

Global MASTER Net