TITLE: GCN CIRCULAR NUMBER: 11542 SUBJECT: Short GRB 110106A: MASTER OT observations DATE: 11/01/07 15:54:51 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov Sternberg Astronomical Institute, Moscow State University V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB110106A (Mangano et al., GCN Circ 1152) 17 sec s after notice time and 41 sec after GRB time at 2011-01-06 15:25:57.96 UT in two polarizations+filter R (Gorbovskoy et al., GCN Circ 11523). We marginally see OT about 16.0+-0.5 mag in XRT error box on second set at 2011-01-06 15:26:19 (starting 69 s after trigger time with 10 sec exposition, Gorbovskoy et al., GCN Circ 11523). The OT positon: RA= 05 17 13.98 DEC= 64 10 23.5 the error +-4" and coincident with late OT TNG position (Malesani et al., GCN Circ 11524). GRB trigger time: 15:25:16 Time UT T-T_trigger Exp Filter Mag 15:25:57 41 10 Cr >16,1 15:26:19 63 10 R+P 16,0+-0.5 15:26:40 84 20 R+P >16,6 15:27:11 115 20 R+P >16,6 15:27:42 146 30 R+P >17,0 15:28:23 187 40 R+P >17,2 15:29:14 238 50 R+P >17,4 15:30:15 299 60 R+P >17,5 15:31:26 370 70 R+P >17,7 15:32:47 451 90 R+P >17,9 15:34:28 552 110 R+P >18,0 15:36:29 673 130 R+P >18,1 15:38:51 815 160 R+P >18,3 15:41:42 986 180 R+P >18,3 15:44:53 1177 180 R+P >18,4 The more detailed data are available at http://observ.pereplet.ru/images/GRB110106A/grb.html We see the galaxy near (~8" distance, in our prevous Circ 11523 we not include the binning CCD scale = 4"/pix) OT on later images with long exposition. The redshift z=0.093 (Piranomonte et al., GCN Circ 1130) is typical for short bursts. The origin of the GRB110106A is no connected with massive star core collapse because long distance from center of the host galaxy (independently of the host galaxy type!). The origin of the GRB connected with the NS+NS or NS+BH merging (Lipunov et al.,1995, "Evolution of the Double Neutron Star Merging Rate and the Cosmological Origin of Gamma-Ray Burst Sources", Astrophysical Journal v.454, p.593.; Lipunov, 1997, Relativistic Binary Merging Rates, The Invited Review on Joint Discussion "High Energy Transients" on XXIIIrd General Assembly of IAU, Kioto, 1997, http://adsabs.harvard.edu/abs/1997astro.ph.11270L). The message may be cited. mailto: lipunov@sai.msu.ru