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 (firstname.lastname@example.org)
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