TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4349 SUBJECT: GRB051105: optical observations DATE: 05/12/14 18:07:57 GMT FROM: Alexei Pozanenko at IKI, Moscow D. Sharapov, M. Ibrahimov (MAO), A.Pozanenko (IKI), V.Rumyantsev (CrAO) on behalf of larger GRB follow up collaboration report: We observed the error box of short duration GRB051105 (Mineo et al. GCN 4188) with 1.5m telescope of Maidanak Astronomical Observatory under good weather condition (seeing ~1.1). Set of R images were taken starting on Nov.5 (UT) 13:59, i.e. 7.6 hours after burst onset. The BAT refined error box (Barbier et al. GCN 4194) is partially covered (~70%). The second set of R images were taken on Dec.1 between (UT) 13:33 and 14:09. The following R magnitudes of objects mentioned in GCN circulars 4195,4196,4201,4199,4202,4203,4204 were estimated at mean epoch of observation (UT) Nov.5 14:17 --------------------------------------------------------- R.A. (J2000) Decl. (J2000) R(mag) ID --------------------------------------------------------- 17 41 10.00 +34 55 45.2 21.50 0.16 inside XRT S1 17 41 10.28 +34 55 41.1 22.54 0.40 outside XRT S1 17 41 03.28 +34 59 03.6 out of image radio --------------------------------------------------------- The estimations are based on the comparison star magnitude R=17.0 used by Piranomonte et al. (GCN 4201); coordinates in the table are taken from Halpern at al. (GCN 4202). No new/fading source was detected within ~70% of refined BAT error box (Barbier et al. GCN 4194) between both epochs of our observations. The photometry of extended galaxy mentioned by Klose, Laux, & Stecklum (GCN 4196) and details of the observations are following Mid time, Exposure, Galaxy, Mag.(UL),Seeing (UT) (s) R(mag) Nov.5 14:17 1380 18.211 +/- 0.022 22.1 1.10" Dec.1 13:51 1800 18.122 +/- 0.019 21.8 1.45" Using available at this time observations we cannot confirm possible re-brightening of the galaxy in the 2nd epoch. Detailed calibrations are necessary and further monitoring of the galaxy would be encouraged. If confirmed then it might be connected with SN associated with short duration GRB051105. The stacked images of both epochs can be found at http://grb.rssi.ru/GRB051105/. The message may be cited.