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The Short Bright Optical Event in NGC4632 Galaxy Direction

ATel #8308; E. Popova, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. V.Chazov, V. Kornilov, A. Kuznetsov, I. Gorbunov, V. Vladimirov (M. V. Lomonosov MSU, SAI),R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), N. Budnev, O. Gress, K. Ivanov (Irkutsk State University, Applied Physics Institute)
on 19 Nov 2015; 18:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Transient

Referred to by ATel #: 8326

MASTER OT J124235.77-000444.0 - short OT in NGC4632?

MASTER-IAC auto-detection system Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 12h 42m 35.77s -00d 04m 44.0s (error ~0.7 arcsec) on 2015-11-19.26103 UT . The OT unfiltered magnitude is 14.9m (limit 17.8m).

The OT is seen in 3 images during ~15 min. There is no minor planet at this place.

We have reference image without OT on 2015-06-06.95402 UT with unfiltered magnitude limit 19.6m. The preliminary photometry is:

 
Pro.type	Date          time 	Exp.time   OT   Limit	Filt.	Tube. 
                               UT         s 
Survey 	    2015-11-19      06:06:26	  60	  17.6   17.8   Unfil	WEST 
Survey 	    2015-11-19      06:14:11	  60	  17.4   17.6	Unfil	WEST 
Survey 	    2015-11-19      06:15:53	  60	  14.9   17.8   Unfil	WEST 
Survey      2015-11-19      06:20:50	  60	 >17.7   17.7	Unfil	WEST 
  

There is bright NGC4632 galaxy with B=12.3. The OT offset is 53"E and 13"N .

The maximal OT flux is ~ 6 10e12 erg/s . The absolute magnitude corresponded to distance to NGC 4632 is M = -15.7 from Tully-Fisher method measurements. The corresponding optical luminosity is about 10e41 erg/sec ( D=13 Mpc ). For example, the shock break-out phenomena observed in SN 2006aj by Swift UVOT (Campana et.,al. 2006, Nature, 442, 1008.) show same optical flux but with one order distance more.

There are no near Earth objects at this place.

There are no any GRB events around this time and this position.

Discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ124235.77-000444.0.jpg

Deep and not deep follow up observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net