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MASTER discovery of a Possible Supernova in error box of Fermi trigger 429246673

ATel #6379; V. Shumkov, 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, 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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 9 Aug 2014; 18:58 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Gamma-Ray Burst, Supernovae, Transient

MASTER OT J114655.24+660959.3 - possible Supernova

During the observations of the error box of possible GRB 140809A (Fermi trigger 429246673) MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 11h 46m 55.24s +66d 09m 59.3s on 2014-08-09.63454 UT. The OT unfiltered magnitude is 17.0m (limit 19.1m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2014-04-21.58762 UT with unfiltered magnitude limit 20.0m.

The new object is located 1.5" east and 17" north of the center of galaxy PGC 36760 = SDSS J114654.97+660942.3 (g=15.34 r=14.73 i=14.42) with z=0.0413. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/114655.24660959.3.png

It is not clear whether the optical transient is related to the gamma-ray burst or is just a chance coincidence. Spectral and photometric confirmation is requested. Observations in X-rays and other wave bands are also strongly encouraged.

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net