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Large Amplitude OT discovered by MASTER during Fermi Trigger 431154544 follow up observations

ATel #6441; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, 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 (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), 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, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 3 Sep 2014; 19:02 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Gamma-Ray Burst, Transient

MASTER OT J190844.92+254447.3 - new CV candidate

During the follow up observations of Fermi trigger 431154544 MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 19h 08m 44.92s +25d 44m 47.3s on 2014-09-01.62766 UT. The OT unfiltered magnitude is 16.8m (limit 19.0m). The OT is seen in 24 images. There is no minor planet at this place. We have reference image without OT on 2010-09-05.71086 UT with unfiltered magnitude limit 17.8m.

There is nothing at this position in any catalogs and AAVSO VSX. Nothing is visible on the digitized Palomar plates and on their combination to the limiting magnitude ~21.5. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J190844+254447-BRIR5x5.jpg (2x zoom). This area of sky in Lyra near Vulpecula border is not covered by SDSS, NEAT and CRTS. Galactic latitude is +8 deg.

The coverage map of Fermi error box by MASTER Net is available at http://master.sai.msu.ru/static/GRB140831-MASTER-coverage.png with 1-sigma and 3-sigma error circles shown. Since the OT was detected approximately 35 hours after Fermi trigger, it is unlikely to be a GRB afterglow. Based on the outburst amplitude (at least 5m), MASTER OT J190844.92+254447.3 is most likely a new cataclysmic variable (dwarf nova in superoutburst). Spectral and photometric observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/190844.92254447.3.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net