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MASTER OT 123412-632503 detection during Swift trigger 518853

ATel #4007; E. Gorbovskoy, V. Lipunov, P. Balanutsa, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov. D. Kuvshinov (Moscow Lomonosov State University, SAI), Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest, Observatorio Astronomico Felix Aguilar (OAFA), V. Krushinsky, I. Zalozhnih, A. Popov (Ural Federal University) 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 the Pulkovo observatory RAS) V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov (Blagoveshchensk Educational University), S. Shurpakov (MASTER team members),
on 29 Mar 2012; 13:20 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Gamma Ray, Cosmic Rays, Gamma-Ray Burst, Transient

MASTER-ICATE robotic Very Wide Field Camera ( ) located in Argentina was pointed to the area of the Trigger 518853 (Barthelmy et al., GCN Circ 13166 http://gcn.gsfc.nasa.gov/gcn3/13166.gcn3 ) several minutes before notice time (due to Swift pointing info) and 12.9 min after GRB time at 2012-03-29 02:34:16.391.

We find OT with Mag = 13.2 (unfiltered red CCD) at

    Ra=188.552513    Dec=-63.417673       
    Ra=12:34:12.6    Dec=-63:25:03      
with 25" sec 3-sigma error box.

There is 2MASS nonstar object 12340720-6325129 with 1.2 arcsec offset. That is inside XRT error box.

The absence OT in UVOT data may be connected with very high reddening of the source by Galactic extinction and distinction in time observations.

The follow up IR observations are requied to chose between CR or High Energy Transient nature (Evans and Osborne, GCN Circ 13167 http://gcn.gsfc.nasa.gov/gcn3/13167.gcn3 ) of the event.

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