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Possible Nova and Flaring Quasar discovered by MASTER

ATel #6005; O. Gress (Irkutsk State University), D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, 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 (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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 24 Mar 2014; 12:32 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Nova, Quasar, Transient

MASTER OT J192809.82+551616.5 - possible Nova

Following the discovery of large amplitude optical transient MASTER OT J192809.82+551616.5 (Balanutsa et al., ATel #5994) we have checked the archival data of MASTER network and obtained the additional observations. Selected unfiltered magnitudes (including an upper limit 26 hours before the first positive detection) are listed in the table below.

Observ. date, UT    Mag.   Observatory 
-------------------------------------------- 
2014 Mar. 15.686  <16.6C   MASTER-Kislovodsk 
2014 Mar. 16.778   15.9C   MASTER-Amur 
2014 Mar. 20.749   16.7C   MASTER-Amur 
2014 Mar. 22.743   17.4C   MASTER-Tunka 
2014 Mar. 23.910   17.2C   MASTER-Tunka  
-------------------------------------------- 
The object has shown a rapid fading followed by the plato. Combined with the large amplitude (~7m or more), such a behavior is not typical for normal outbursts of dwarf novae. It could be a classical Nova with bright maximum missed on Mar. 17-19, or a precursor outburst of an extreme dwarf nova of WZ Sge or AM CVn type.

Spectral classification is required. BVRI photometry is also encouraged, as well as checking the data from other surveys.

MASTER OT J124851.01+483953.5 - flaring quasar

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 12h 48m 51.01s +48d 39m 53.5s on 2014-03-23.66150 UT. The OT unfiltered magnitude is 18.0m (limit 19.7m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-04-26.70269 UT with unfiltered magnitude limit 20.1m.

The OT at quiescence is identical to quasar B1246+4856 = NVSS J124850+483953 = SDSS J124850.94+483953.1 (u=21.44 g=21.09 r=20.54 i=20.13 z=19.79) at z=1.856. No previous outbursts were detected by CRTS.

Multi-wavelength observations are strongly encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/124851.01483953.5.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net