Fast OT discovered by MASTER in SDSS galaxy

ATel #4745; V. Lipunov, E. Gorbovskoy, D. Denisenko, P. Balanutsa, V. Yecheistov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova, (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), S. Shurpakov, V. Shumkov, P. Podvorotny (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 18 Jan 2013; 16:05 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J113751.67+061231.6 - fast OT

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 11h 37m 51.67s , +06d 12m 31.6s on 2013-01-15.99 UT. Astrometrical accuracity is about 0.8 arcsec. The OT unfiltered magnitude is 19.0m (limit 19.7 m). The OT is seen in 3 images. We have 4 consequance images:

 
 
         UT(start)         Exp. time          mag_OT    fwhm   mean fwhm      m_lim 
                                                               field stars  
2013-01-15 23:11:29            60s            >19.5       -       2.1          19.5         
2013-01-15 23:57:40            60s             19.0      1.8      2.0          19.7 
2013-01-15 23:59:09            60s             18.7      2.1      2.0          19.7 
2013-01-16 00:00:41            60s            ~19.7       ?       2.0          19.5  
 

We have reference image without OT on 2013-01-15 23:11:29 UT with unfiltered magnitude limit 19.5m.

There is SDSS galaxy J113751.72+061231.3 with 0.8 arcsec offset (inside our error box) with rmag = 19.3. This galaxy is represented as GALEX-DR5 source, WISE source, UKIDSS source.

There is no GRB at this time. The 6 hours before FERMI detected Gamma trigger Num 379962642 with 7 degrees error box covered OT position.

The OT may be result of pre SN (shock breakout), AGN activity or Orphan nature.

Spectral, X-ray and other band observations are required.

The discovery, OT and reference images are available at: http://master.sai.msu.ru/static/OT/113751.67+061231.png

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