TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3857 SUBJECT: GRB050813: Maidanak I-band observations DATE: 05/08/22 19:39:34 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 GRB050813 (GCNs 3788, GCN 3790) with 1.5m telescope of Maidanak Astronomical Observatory. Set of I images were taken between (UT) 16:47 - 17:44, on August 13, 2005 under poor weather conditions (seeing of ~ 1.15"). Limiting magnitude of stacked image (6x300 s) is I ~ 21. Detailed photometry of the field objects which is required variable background accounting is underway. The stacked image can be found in http://grb.rssi.ru/GRB050813/grb050813_AZT22_I.jpg. This message may be cited.