{
  "bibcode": "2005GCN..3864....1K",
  "body": "I. Khamitov, Z. Aslan (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.),\nI. Bikmaev, A. Galeev, N. Sakhibullin (KSU/AST),\nR. Burenin, M. Pavlinsky, R. Sunyaev (IKI),\n\nreport:\n\n      We have continued  observing the OT of GRB 050820A (GCN 3829) with\nthe Russian-Turkish 1.5-m telescope (Bakirlitepe, TUBITAK National \nObservatory, Turkey)  on the nights of August 22 and 23  in B,Rc,Ic bands.\n      We made a series of exposures between UT 20:23 - 01:33, August 22/23,\nand between UT 20:09-00:34, August 23/24, 2005. The afterglow is still \nclearly detected in all bands. Using  Henden's stars (GCN 3845) present\nin the frames, we estimated the magnitudes as follow:\n\n   t-t0 \tBand mag     merr  exptime\n(hours)                   (sec,total)\n64.39   B   22.24 -/+ 0.06 7860\n64.43   Rc  21.02 -/+ 0.03 3900\n64.53   Ic  20.46 -/+ 0.05 3900\n\n87.57   B   22.57 +/- 0.08 5400\n87.72   Rc  21.30 +/- 0.04 2700\n87.82   Ic  20.87 +/- 0.09 2700\n\n      We note that, on re-examining the co-added image for 21 Aug in B-band\n(GCN 3853), we noticed that it included a cosmic ray event close to OT.\nMore careful  calculation has resulted in a fainter value of B magnitude: \n21.47 +/- 0.06 (40.93h after the trigger).\n\nThis message may be cited.",
  "circularId": 3864,
  "createdOn": 1124886390000,
  "email": "irekk@tug.tug.tubitak.gov.tr",
  "subject": "GRB050820A: RTT150 optical observations",
  "submitter": "Irek Khamitov at TUG  <irekk@tug.tug.tubitak.gov.tr>",
  "eventId": "GRB 050820A"
}